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Trippy depression treatment? Hopes and hype for ketamine

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Lauren Pestikas sits as she receives an infusion of the drug ketamine during a 45-minute session at an outpatient clinic in Chicago on July 25, 2018. Pestikas struggled with depression and anxiety and made several suicide attempts before starting ketamine treatments earlier in the year. (AP Photo/Teresa Crawford)

CHICAGO (AP) — It was launched decades ago as an anesthetic for animals and people, became a potent battlefield pain reliever in Vietnam and morphed into the trippy club drug Special K.

Now the chameleon drug ketamine is finding new life as an unapproved treatment for depression and suicidal behavior. Clinics have opened around the United States promising instant relief with their “unique” doses of ketamine in IVs, sprays or pills. And desperate patients are shelling out thousands of dollars for treatment often not covered by health insurance, with scant evidence on long-term benefits and risks.

Chicago preschool teacher Lauren Pestikas long struggled with depression and anxiety and made several suicide attempts before trying ketamine earlier this year.

The price tag so far is about $3,000, but “it’s worth every dime and penny,” said the 36-year-old.

Pestikas said she feels much better for a few weeks after each treatment, but the effects wear off and she scrambles to find a way to pay for another one.

For now, ketamine has not received approval from the U.S. Food and Drug Administration for treating depression, though doctors can use it for that purpose.

Some studies show ketamine can provide relief within hours for tough-to-treat depression and suicidal behavior and clinics promising unproven benefits have popped up nationwide. But more research is needed to know long-term benefits and risks. (Oct. 31)

Ketamine has been around since the 1960s and is widely used as an anesthesia drug during surgery because it doesn’t suppress breathing. Compared to opioids such as morphine, ketamine isn’t as addictive and doesn’t cause breathing problems. And some studies have shown that ketamine can ease symptoms within hours for the toughest cases.

Its potential effects on depression were discovered in animal experiments in the late 1980s and early 1990s showing that glutamate, a brain chemical messenger, might play a role in depression, and that drugs including ketamine that target the glutamate pathway might work as antidepressants.

Conventional antidepressants like Prozac target serotonin, a different chemical messenger, and typically take weeks to months to kick in — a lag that can cause severely depressed patients to sink deeper into despair.

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A vial of ketamine, which is normally stored in a locked cabinet, on display in Chicago on July 25, 2018. AP Photo/Teresa Crawford)

Ketamine’s potential for almost immediate if temporary relief is what makes it so exciting, said Dr. Jennifer Vande Voort, a Mayo Clinic psychiatrist who has used ketamine to treat depression patients since February.

“We don’t have a lot of things that provide that kind of effect. What I worry about is that it gets so hyped up,” she said.

The strongest studies suggest it’s most useful and generally safe in providing short-term help for patients who have not benefited from antidepressants. That amounts to about one-third of the roughly 300 million people with depression worldwide.

“It truly has revolutionized the field,” changing scientists’ views on how depression affects the brain and showing that rapid relief is possible, said Yale University psychiatrist Dr. Gerard Sanacora, who has done research for or consulted with companies seeking to develop ketamine-based drugs.

But to become standard depression treatment, he said, much more needs to be known.

Last year, Sanacora co-authored an American Psychiatric Association task force review of ketamine treatment for mood disorders that noted the benefits but said “major gaps” remain in knowledge about long-term effectiveness and safety. Most studies have been small, done in research settings and not in the real world.

When delivered through an IV, ketamine can cause a rapid increase in heart rate and blood pressure that could be dangerous for some patients. Ketamine also can cause hallucinations that some patients find scary.

“There are some very real concerns,” Sanacora said. “We do know this drug can be abused, so we have to be very careful about how this is developed.”

Dr. Rahul Khare, an emergency medicine specialist in Chicago, first learned about ketamine’s other potential benefits a decade ago from a depressed and anxious patient he was preparing to sedate to fix a repeat dislocated shoulder.

“He said, ‘Doc, give me what I got last time. For about three weeks after I got it I felt so much better,’” Khare recalled.

Khare became intrigued and earlier this year began offering ketamine for severe depression at an outpatient clinic he opened a few years ago. He also joined the American Society for Ketamine Physicians, formed a year ago representing about 140 U.S. doctors, nurses, psychologists and others using ketamine for depression or other nonapproved uses.

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Dr. Rahul Khare poses for a portrait at his outpatient Chicago clinic on July 25, 2018. (AP Photo/Teresa Crawford)

There are about 150 U.S. ketamine clinics, compared with about 20 three years ago, said society co-founder Dr. Megan Oxley.

Khare said the burgeoning field “is like a new frontier” where doctors gather at meetings and compare notes. He has treated about 50 patients with depression including Pestikas. They’re typically desperate for relief after failing to respond to other antidepressants. Some have lost jobs and relationships because of severe depression, and most find that ketamine allows them to function, Khare said.

Typical treatment at his clinic involves six 45-minute sessions over about two weeks, costing $550 each. Some insurers will pay about half of that, covering Khare’s office visit cost. Patients can receive “booster” treatments. They must sign a four-page consent form that says benefits may not be long-lasting, lists potential side effects, and in bold letters states that the treatment is not government-approved.

At a recent session, Pestikas’s seventh, she leaned back on a reclining white examining-room chair as a nurse hooked her up to a heart and blood pressure monitor. She grimaced as a needle was slipped into the top of her left palm. Khare reached up with a syringe to inject a small dose of ketamine into an IV bag hanging above the chair, then dimmed the lights, pulled the window curtains and asked if she had questions and was feeling OK.

“No questions, just grateful,” Pestikas replied, smiling.

Pestikas listened to music on her iPhone and watched psychedelic videos. She said it was like “a controlled acid trip” with pleasant hallucinations. The trip ends soon after the IV is removed, but Pestikas said she feels calm and relaxed the rest of the day, and that the mood boost can last weeks.

Studies suggest that a single IV dose of ketamine far smaller than used for sedation or partying can help many patients gain relief within about four hours and lasting nearly a week or so.

Exactly how ketamine works is unclear, but one idea is that by elevating glutamate levels, ketamine helps nerve cells re-establish connections that were disabled by depression, said ketamine expert Dr. Carlos Zarate, chief of experimental therapies at the National Institute of Mental Health.

A small Stanford University study published in August suggested that ketamine may help relieve depression by activating the brain’s opioid receptors.

Janssen Pharmaceuticals and Allergan are among drug companies developing ketamine-like drugs for depression. Janssen leads the effort with its nasal spray esketamine. The company filed a new drug application in September.

Meanwhile, dozens of studies are underway seeking to answer some of the unknowns about ketamine including whether repeat IV treatments work better for depression and if there’s a way to zero in on which patients are most likely to benefit.

Until there are answers, Zarate of the mental health institute said ketamine should be a last-resort treatment for depression after other methods have failed.

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Ketamine in the News October 2018

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The pros and cons of ketamine

Geuris “Jerry” Rivas, a native of New York, was diagnosed with severe obsessive-compulsive disorder when he was 15. Obsessions with organizing and reorganizing the belongings in his bedroom — posters, comic books, videos — took over most of his life.

Forced by germ obsessions to compulsively wash and rewash his hands, he started wearing gloves all day to both protect him from the germs and stop him from washing his hands raw. Now, at 36, OCD symptoms continue to cost him jobs and relationships. He’s managed to turn his organizational skills into a profession — he’s a home organizer and house cleaner — but still he struggles daily with his obsessions.

“It’s caused me a great deal of suffering,” Rivas says. “I’ve tried many, many medications. I’ve wasted so much of my life.”

In 2012, running out of answers, Rivas took part in the first clinical trial to test ketamine as a treatment for OCD. While ketamine is approved by the U.S. Food and Drug Administration as an anesthetic, it is also an illicit party drug known as “Special K,” with hallucinogenic effects and the potential for abuse. Over the past 10 years, dozens of small studies of ketamine’s ability to treat a variety of mood and anxiety disorders have reported remarkable results — including the sudden alleviation of treatment-resistant depression, bipolar disorder and post-traumatic stress disorder. And these effects lasted days, sometimes weeks, after the hallucinogenic effects of the drug wore off.

With a single infusion of the drug, Rivas experienced for two weeks what it was like to live without the compulsions and obsessions that had for years controlled his life.

“I felt like, for the first time, I was able to function like a regular person,” he says.

Illustration of a giant K being painted by a man in a white coat

Pros and cons

Ketamine has brought hope to a psychiatric field desperate to find new treatments for severe OCD, a chronic condition marked by debilitating obsessions and repetitive behaviors. Current treatments, which include antidepressants such as Prozac, can take months to have any effect on the disease, if they work at all.

“Severe OCD takes such a toll on patients,” says Carolyn Rodriguez, MD, PhD, who as a researcher at Columbia University ran the OCD trial. Now an assistant professor of psychiatry and behavioral sciences at Stanford, she has continued to explore the pros and cons of using ketamine to treat OCD. “The constant, intrusive thoughts that something is contaminated, the checking and rechecking, the repetitive behaviors. It interferes with your life, your jobs, your relationships.”

Ketamine was developed in the 1960s and has been used for decades as an anesthetic during surgery. It remains a mystery just how the drug works in the brain, and there are safety concerns. There is evidence from people who take the drug routinely — in much higher doses — that chronic, high-frequency ketamine use may be associated with increased risk of bladder inflammation and cognitive impairment, Rodriguez says. And if taken regularly, it can lead to dependence.

But researchers like Rodriguez are intrigued about the drug’s potential to help them identify a whole new line of medicines for fast-acting treatment of mental health disorders.

“What most excites me about ketamine is that it works in a different way than traditional antidepressants,” Rodriguez says. “Using ketamine, we hope to understand the neurobiology that could lead to safe, fast-acting treatments. I feel that is part of my mission as a physician and researcher.”

‘Right out of a movie’

Rodriguez’s interest in ketamine as a treatment for OCD was sparked about a decade ago when she was starting out as a research scientist at Columbia. A small, placebo-controlled study published in 2006 by a mentor of hers, Carlos Zarate, MD, now chief of the section on neurobiology and treatment of mood disorders at the National Institute of Mental Health, had shown that ketamine induced dramatic improvement in treatment-resistant depression within two hours of infusion. It was a landmark study, drawing attention among the psychiatric community and launching a new field of research into the use of ketamine to treat various mood and anxiety disorders.

“What most excites me about ketamine is that it works in a different way than traditional antidepressants.”

Rodriguez, intent on searching for better, faster treatments for her patients like Rivas with OCD, took note. There was an emerging theory that ketamine affects the levels of the neurotransmitter glutamate in the brain and increasing evidence that glutamate plays a role in OCD symptoms, she says. Perhaps ketamine could help regulate OCD symptoms as well as depression.

In 2013, Rodriguez and colleagues published their results from that first clinical trial of ketamine in OCD patients. The trial randomized 15 patients with OCD to ketamine or placebo.

In those patients who were given ketamine, the effect was immediate. Patients reported dramatic decreases in their obsessive-compulsive symptoms midway through the 40-minute infusion, according to the study. The diminished symptoms lasted throughout the following week in half of the patients. Most striking were comments by the patients quoted in the study: “I tried to have OCD thoughts, but I couldn’t,” said one. Another said, “I feel as if the weight of OCD has been lifted.” A third said, “I don’t have any intrusive thoughts. … This is amazing, unbelievable. This is right out of a movie.” And while nearly all initially had dissociative effects like feelings of unreality, distortions of time or hallucinations, they were gone within two hours after the start of the infusion.

“Carolyn’s study was quite exciting,” Zarate says, adding that there were a number of similar, small but rigorous studies following his 2006 study that found fast-acting results using ketamine to treat bipolar disorder and post-traumatic stress disorder.

“We had no reason to believe that ketamine could wipe out any symptoms of these disorders within hours or days,” he says.

So how does it work?

Virtually all of the antidepressants used in the past 60 years work the same way: by raising levels of serotonin or one or two other neurotransmitters. Ketamine, however, doesn’t affect serotonin levels. Exactly what it does remains unclear.

“There’s a recognition that people like me and others are using the drug to treat patients now. There’s an incredible need for something.”

Since coming to Stanford in 2015, Rodriguez has been funded by the National Institute of Mental Health for a large clinical trial of ketamine’s effects on OCD. This five-year trial aims to follow 90 OCD patients for as long as six months after they’ve been given a dose of ketamine or an alternative drug. Rodriguez and her research team want to observe how ketamine changes participants’ brains, as well as test for side effects.

Ultimately, Rodriguez says, she hopes the study will lead to the discovery of other fast-acting drugs that work in the brain like ketamine but without its addictive potential.

Recent research in the field indicates that the glutamate hypothesis that triggered her pilot study might be further refined.

“Ketamine is a complicated drug that works on many different receptor sites,” she says. “Researchers have fixated on the NMDA receptor, one of the glutamate-type receptors, but it might not be the only receptor bringing benefit.”

In May 2016, researchers from NIMH and the University of Maryland — Zarate among them — published a study conducted in mice showing that a chemical byproduct, or metabolite, created as the body breaks down ketamine might hold the secret to its rapid antidepressant actions. This metabolite, hydroxynorketamine, reversed depressionlike symptoms in mice without triggering any of the anesthetic, dissociative or addictive side effects associated with ketamine, Zarate says.

“Ideally, we’d like to test hydroxynorketamine and possibly other drugs that act on glutamate pathways without ketamine-like side effects as possible alternatives to ketamine in OCD,” Rodriguez says.

Beyond the clubs

Meanwhile, dozens of commercial ketamine clinics have popped up across the country, making treatments available to patients who are searching for help to stop their suffering now. Medical insurance companies usually cover ketamine’s FDA-approved use as an anesthetic but won’t cover its use for other purposes, such as mental health disorders. So patients who have run out of treatment options are paying hundreds of dollars a dose for repeated ketamine infusions.

“The fact that these clinics exist is due to the desperation of patients,” says Rodriguez.

She and other researchers are calling for guidelines to protect patients and more research to learn how to use the drug safely.

“I think it’s a game changer, and it’s here to stay,” says David Feifel, MD, PhD, professor emeritus of psychiatry at UC-San Diego, who studies the effect of ketamine on clinical depression. Feifel began prescribing the drug for patients with treatment-resistant depression in 2010.

“I’ve found it to be very safe,” Feifel says, adding that the American Psychiatric Association this year issued safety guidelines on how to use ketamine clinically for treatment of depression.

“There’s a recognition that people like me and others are using the drug to treat patients now,” he says. “There’s an incredible need for something.”

The drug hasn’t worked for everyone he’s treated, Feifel says, but for many it’s been “life-changing.”

Rodriguez says she understands what motivates the clinicians to prescribe the drug now to patients in dire straits — those who are suicidal or who have tried every possible medication and therapeutic option and continue to suffer each day.

“I see it as a way to treat people whose OCD is very, very severe,” she says. “People who can’t come out of the house, who are suicidal, who have no other options.

“I just don’t like the idea of people being in pain,” Rodriguez adds. “I want to see science translated into treatments now.”

Meanwhile, researchers are learning more about the drug. Janssen Pharmaceutical is testing the efficacy of a version of ketamine, known as esketamine, as a therapy for treatment-resistant depression and for major depressive disorder with imminent risk for suicide. The FDA has fast-tracked both investigations. At Stanford, Alan Schatzberg, MD, a professor of psychiatry and behavioral sciences, along with other faculty including Rodriguez, is studying the mechanism of action for ketamine in treating depression.

Rodriguez is also interested in using ketamine to kick-start a type of cognitive behavioral therapy called exposure and response prevention, an evidence-based psychological treatment designed to help patients overcome OCD. The therapy involves teaching patients with OCD to face anxieties by refraining from ritualizing behaviors, then progressing to more challenging anxieties as they experience success.

Relaxation and other techniques also help patients tolerate their anxiety — for example, postponing the compulsion to wash their hands for at least 30 minutes, then extending that time period.

“My goal isn’t to have people taking ketamine for long periods of time,” Rodriguez says. But perhaps a short-term course of ketamine could provide its own kind of exposure and response prevention by allowing patients to experience that it is possible not to be controlled by their OCD, she says.

Rivas well remembers that infusion of ketamine he received during Rodriguez’s first clinical trial to test the drug. The rush made him feel “like Superman.”

“I felt like my body was bigger, that I was more muscular, that I could tackle anything,” he says. But that feeling only lasted the duration of the 40-minute infusion. His OCD symptoms disappeared immediately and were still gone for two weeks after.

“I was amazed that something like that would work and work so fast,” he says. His OCD symptoms today are still intrusive, but he manages to keep them under control by taking antidepressants and seeing a therapist. Still, each day when he comes home from work, he has to put gloves on before he enters his apartment building, and as soon as he enters his apartment, he must wash his hands.

“It’s a ritual now,” he says. “There has never been a time that I haven’t done that, except those two weeks after the ketamine.”

When he heard that certain private ketamine clinics are now offering the drug as treatment for OCD, he said he understands why patients take the risks and pay the high prices. As more research has become available, he’s begun considering it himself.

“I’ve been suffering through my OCD for so long, I’ve gotten to the point where I’d try anything,” he says.

USING KETAMINE TO TREAT SEVERE MENTAL ILLNESSA conversation with Stanford psychiatrist Carolyn Rodriguez, MD, PhD, about how she got interested in the use of ketamine to treat obsessive-compulsive disorder and how she is determined to find out why, in studies, the drug has provided relief from symptoms.

AUDIO Interview

Addiction Domain LINK

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The Psychopharmacology of Depression: Strategies, Formulations, and Future Implications

 

With well over two dozen traditional antidepressants available in the US, and an ever-growing list of other psychotropic compounds with apparent antidepressant properties, pharmacological options for treating clinical depression today are broad and vast. However, recent findings suggest that the magnitude of efficacy for most antidepressants compared with placebo may be more modest than previously thought.1Most depressed patients do not respond fully to a first antidepressant trial, and with each consequent trial, there is less chance of symptom remission.2 About one-third of patients receiving long-term treatment report persistent moderate-to-severe depression.3 Hence, there remains more than a little room for improvement.

Since the late 1950s, the traditional view of treating depression has focused on the role of monoamines (serotonin, norepinephrine, and dopamine) as the main targets for medications. Newer treatments are looking beyond effects on monoamines as potential strategies to leverage depressive symptoms.

A major challenge for progress in novel pharmacotherapies has been our lack of a full understanding about the causes of depression. Advances in functional neuroimaging and genetic markers have begun to shed new light on brain regions and pathways associated with aberrant neural functioning in depression, but not in ways that have led to treatments aimed at remedying its pathogenesis. This makes it hard to think of antidepressant medications as “treating” the pathophysiology of depression (as when antibiotics eliminate the cause of an infection); rather, antidepressant relieve symptoms by counteracting or compensating for depression’s consequences (as when diuretics alleviate peripheral edema regardless of its etiology).

Gone are the days of oversimplified theories that depression is caused by a “chemical imbalance.” More likely, depression involves changes in brain architecture and the interplay of complex circuits in which chemicals, or neurotransmitters, are the messengers of information, rather than the causes of faulty functioning. Table 1 summarizes some of the major conceptual shifts that have occurred in thinking about the probable causes of depression (or at least its neurobiological context), which sets the stage for new ways to consider innovative treatment strategies. Looking beyond the role of monoamines as treatment targets in depression, a number of novel therapeutic strategies have begun to receive growing interest in preclinical and clinical trials. Key points about emerging novel depression pharmacotherapies are summarized in Table 2, and described more fully below.

Subanesthetically dosed intravenous (IV) ketamine currently represents perhaps the most dramatic and innovative antidepressant pharmacotherapy to emerge in decades.4,5 It is pharmacodynamically unique in its rapid onset (hours rather than days to weeks) and its potential ability to reduce suicidal ideation after a single dose, independent of its antidepressant properties.6 (While both lithium and clozapine have been shown to reduce suicidal behaviors, neither has been shown to reduce ideation, much less in the same day after a single dose.) Meta-analyses suggest that 0.5 mg/kg IV ketamine produces nearly a 10-fold greater likelihood of response than placebo at day 1 and a 4- to 5-fold likelihood of sustained response after one week.7

The exact psychotropic mechanism of action of ketamine remains elusive. Initial work focused on blockade of ionotropic N-methyl-D-aspartate (NMDA) receptors as accounting broadly for its antidepressant effects. However, subsequent negative randomized trials with other NMDA receptor antagonists (such as riluzole8) redirected interest toward ketamine’s other, non-NMDA receptor-related mechanisms, such as sigma receptor agonism, mu opioid receptor antagonism, or midbrain monoaminergic inhibition. Other authors have suggested that at low doses, ketamine’s antidepressant effects may derive from an increase in glutamate transmission with increased α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor expression, leading to increased release of brain-derived neurotrophic factor (BDNF).9Murrough and colleagues10 recently observed the necessity of AMPA receptor activation for the antidepressant effects of ketamine. They reported that “directly targeting the NMDA [receptor] may not be required.” As noted by the American Psychiatric Association Council on Research Task Force on Novel Biomarkers and Treatments,11 future advances will depend on a better understanding of the many mechanisms of action relative to the antidepressant properties of ketamine.

Ketamine is currently not approved by the FDA as a treatment for depression. Uncertainty remains as to whether repeated dosing is safe, effective, and necessary to avoid relapse and, if so, when, at what frequency, and for how long. The aforementioned APA Council on Research Consensus Statement on ketamine treatment for depression11 stated that while some clinics already offer 2- to 3-week courses of ketamine delivered 2 to 3 times per week, “there remain no published data that clearly supports this practice, and . . . the relative benefit of each ketamine infusion [should] be considered in light of the potential risks associated with longer term exposure to ketamine and the lack of published evidence for prolonged efficacy with ongoing administration.” 11 Thus far, studies of other pharmacotherapies to sustain an initial ketamine response (such as riluzole or lithium) have proven no better than placebo.

Enantiomeric esketamine remains investigational as a possible easier-to-administer intranasal (IN) antidepressant, although IN bioavailability is only about half that of IV ketamine’s 100%. Two randomized multi-site trials of IN esketamine added to antidepressants showed dose-related better efficacy than placebo: Daly and colleagues12 found that 28 mg to 84 mg of IN ketamine twice weekly over two weeks produced significant improvement in depressive symptoms as compared to placebo beginning after 1 week and continuing through week 9 for the majority of responders. A study by Canuso and colleagues13 demonstrated a significant reduction in depressive symptoms within 4 hours of administration (56 mg to 84 mg insufflated over 15 minutes) and a medium to large effect size, sustained after 25 days; suicidal ideation reduced significantly at 4 hours but not beyond that time. Another recent randomized pilot trial of IN racemic ketamine (the mixture of S- and R-ketamine) was prematurely discontinued due to poor tolerability (including cardiovascular and neurological adverse effects) and highly variable absorption across subjects.14

Modulation of the endogenous opioid system has long been a target of interest in the treatment of mood disorders, but it is limited by safety risks, tolerance, and addiction potential. Recent work has focused on a proprietary combination of the μ-opioid partial agonist/kappa antagonist buprenorphine plus the μ-opioid receptor antagonist samidorphan (ALKS 5461). The potent blockade of μ-opioid receptors in samidorphan, which prevents buprenorphine access to these receptors, effectively renders buprenorphine a selective kappa opiate receptor (KOR) antagonist, which is its putative antidepressant mechanism. After initial favorable Phase II trials, in 2013 the FDA granted ALKS 5461 fast track status for accelerated regulatory review as an antidepressant adjunct. Subsequent randomized trials in treatment-resistant major depression revealed statistically significant differences from placebo on some, but not all, depressive symptom outcome measures and at some, but not all, doses studied.15,16 The FDA initially refused to review the new drug application for ALKS 5461 as an adjunctive therapy for depression because of concerns about bioavailability and lack of evidence, but then reversed its position. ALKS 5461 is currently under regulatory review and a decision regarding its possible approval is expected by early 2019.

Antiinflammatories and immunomodulators

There has been growing recognition of complex interrelationships between depression and inflammation. Some but not all patients with clinically significant depression appear to have elevated serum markers of systemic inflammation, such as high sensitivity C-reactive protein (hs-CRP) and inflammatory cytokines. While causal relationships between depression and inflammation are poorly understood and questions remain whether depression causes inflammation or vice versa, randomized trial data suggest potential antidepressant value of nonsteroidal anti-inflammatory drugs (NSAIDs), particularly the COX-2 inhibitor celecoxib. A pooled meta-analysis of 5447 participants from 10 NSAID trials and 4 cytokine inhibitors (as mono- or add-on therapy for depression) revealed statistically significant advantages over placebo, with small to medium effect sizes, for response (odds ratio = 6.6; 95% confidence interval=2.2-19.4) or remission (odds ratio = 7.9; 95% confidence interval=2.9-21.1)17It has not been established whether adding celecoxib or other NSAIDs to an antidepressant may be more useful only in the setting of elevated serum markers of inflammation. Elsewhere, preliminary studies reveal that inflammatory depressive subtypes (ie, high baseline hs-CRP) may respond better to a tricyclic than SSRI,18 adjunctive L-methylfolate,19 or the tumor necrosis factor (TNF) antagonist infliximab (admnistered IV at 5 mg/kg over 3 doses).20

The antimicrobial minocycline exerts anti-inflammatory and anti-oxidative properties and has been preliminarily studied mostly in small or open/nonrandomized trials. A meta-analysis of 3 randomized controlled trials found an overall significantly greater effect than placebo with a medium to large effect size and good tolerability, although the small number of well-designed studies and samples sizes (total N = 158) limits their generalizability.21

Anticholinergic muscarinic agents

Harkening back to the 1970s hypothesis that depression could reflect cholinergic-adrenergic dysregulation, interest has turned to the possible antidepressant effects of the muscarinic cholinergic antagonist scopolamine. Preliminary studies of intravenous scopolamine dosed at 4 µg/kg in both unipolar and bipolar depression have produced remission rates from 45% to 56% (Cohen’s d ranged from 1.2-3.4) typically within several days of administration, with persistence for 10 to 14 days.22Antimuscarinic adverse effects such as sedation, dry mouth, and blurry vision are common but transient. Neurocognitive measures reaction time during selective attention tasks reveal no significant delays following IV scopolamine infusion.23 Analogous to IV ketamine, questions remain about the optimal number of infusions to minimize relapse as well as the use of nonparenteral formulations.

Brexanolone (SAGE-547), also known as allopregnanolone, is a positive allosteric modulator of GABA-A receptors. It is a progesterone metabolite that exerts neuroprotective, pro-cognitive, and possible antidepressant/anxiolytic properties. Precipitous drops in progesterone and allopregnanolone after childbirth prompted interest in the use of allopregnanolone specifically in postpartum depression. A small (N = 21) initial trial of brexanolone (administered intravenously because of its short half-life and poor oral bioavailability) or placebo for severe postpartum depression yielded a substantial reduction in depressive symptom severity within 60 hours (effect size = 1.2).24 Further data remain pending. SAGE-217 is reformulated brexanolone that has good oral bioavailability, allowing for oral administration, as well as a longer half-life allowing once-a-day dosing. It is currently being studied as an adjunctive agent for treatment resistant depression.

PPAR-γ agonists and incretins

Thiazolidinediones are insulin sensitizers that also demonstrate antidepressant properties in animal studies and appear to possess anti-inflammatory, neuroprotective, antioxidant and anti-excitatory properties. Pioglitazone, a PPAR-γ agonist thiazolidinedione, has been studied versus placebo or metformin in major depression, both as monotherapy and in combination with antidepressants or lithium. A meta-analysis of 4 trials revealed significantly higher remission rates than controls (27% versus 10%, respectively; odds ratio of remission in major depression = 5.9 (95% confidence interval=1.6-22.4), p = .009), with an NNT = 6.25 Even though PPAR-γ agonists can decrease insulin resistance, weight gain can be an undesired adverse effect that is possibly a result of a combination of fat cell proliferation, fluid retention, and increased appetite. Pioglitazone also carries serious adverse risks for congestive heart failure and bladder cancer.

Glucagon-like peptide 1

Another class of antidiabetic drugs known as glucagon-like peptide 1 (GLP-1) agonists mimic the action of insulin (so-called incretins) and are of interest as a potential target for depression. GLP-1 agonists such as liraglutide possess neuroprotective and antiapoptotic properties, and animal studies suggest it has antidepressant and pro-cognitive effects, particularly involving reward and motivation. Human studies have thus far focused more on weight-reducing and possible cognitive benefits of liraglutide more than its potential antidepressant efficacy, but its mechanism represents a promising direction for further study.

Future directions

This brief overview has focused on emerging novel pharmacotherapies for depression. While the provisional nature of proof-of-concept studies may be encouraging, they are far from definitive. The aforementioned findings are largely preliminary and meant more to prompt larger randomized trials to establish efficacy, safety, and generalizability rather than inspire premature immediate uptake into clinical practice.

Given the focus on neuroprotection and enhanced neuroplasticity as proposed targets of treatment, it would seem remiss not to at least mention the neurobiological impact of depression-specific psychotherapies, mindfulness meditation, and related psychosocial interventions. Psychotherapy is, among other things, a behavioral learning paradigm, presumably rendering alterations in cognitive functions (memory, attention, and decision-making), fear extinction, and emotional processing. Evidence-based psychotherapies for depression have been shown to produce changes in brain network connectivity26 (recapitulating the idea of Hebbian synapses, where “neurons that fire together wire together”) and upregulation of intracellular transcription factors involved in neuronal plasticity.27Enhanced neuroplasticity may represent a common denominator target for effective biological or psychosocial treatments for depression.

Increasingly, drugs we call antidepressants are diversifying to include broader classes of molecules. A more neuroscience-based nomenclature for psychotropic drugs has already been proposed28 and will no doubt invoke more novel drug mechanisms, supplanting older concepts about depression as a chemical imbalance as perspectives continue to evolve about how antidepressants impact neuronal viability and brain microarchitecture.

References:

1. Cipriani A, Furukawa TA, Salanti G,et al.Comparative efficacy and acceptability of 21 antidepressant drugs for the acute treatment of adults with major depressive disorder: a systematic review and network meta-analysis. Lancet 2018; S0140-6736:32802-7. [Epub ahead of print]

2. Trivedi MH, Rush AJ, Wisniewski SR, et al. Evaluation of outcomes with citalopram for depression using measurement-based care in STAR*D: implications for clinical practice. Am J Psychiatry. 2006;163:28-40.

3. Cartwright C, Gibson K, Read J, et al. Long-term antidepressant use: patient perspectives of benefits and adverse effects. Patient Prefer Adher. 2016;10:1401-1407.

4. Zarate CA Jr., Singh JB, Carlson PJ, et al. A randomized trial of an N-methyl-D-aspartate antagonist in treatment-resistant major depression. Arch Gen Psychiatry. 2006;63:856-864.

5. Murrough JW, Iosifescu DV, Chang LC, et al. Antidepressant efficacy of ketamine in treatment-resistant major depression: a two-site randomized controlled trial. Am J Psychiatry. 2013;170:1134-1142.

6. Wilkinson ST, Ballard ED, Bloch MH, et al. The effect of a single dose of intravenous ketamine on suicidal ideation: a systematic review and individual participant data meta-analysis. Am J Psychiatry. 2018;175:150-158.

7. Newport DJ, Carpenter LL, McDonald WM, et al. Ketamine and other NMDA antagonists: early clinical trials and possible mechanisms in depression. Am J Psychiatry. 2015;172:950-966.

8. Mathew SJ, Gueorguieva R, Brandt C, et al. A randomized, double-blind, placebo-controlled, sequential parallel comparison design trial of adjunctive riluzole for treatment-resistant major depressive disorder. Neuropsychopharmacol 2017;42: 2567-2574.

9. Duman RS, Li N, Liu RJ, et al. Signaling pathways underlying the rapid antidepressant actions of ketamine. Neuropharmacol. 2012;62:35-41.

10. Murrough JW, Abdallah CG, Mathew SJ. Targeting glutamate signalling in depression: progress and prospects. Nat Rev Drug Discov. 2017;16:472-486.

11. Sanacora G, Frye MA, McDonald W, et al. A consensus statement on the use of ketamine in the treatment of mood disorders. JAMA Psychiatry. 2017;74:399-405.

12. Daly EJ, Singh JB, Fedgchin M, et al. Efficacy and safety of intranasal esketamine adjunctive to oral antidepressant therapy in treatment-resistant depression: a randomized clinical trial. JAMA Psychiatry. 2018;75:139-148.

13. Canuso CM, Singh JB, Fedgchin M, et al. Efficacy and safety of intranasal esketamine for the rapid reduction of symptoms of depression and suicidality in patients at imminent risk for suicide: results of a double-blind, randomized, placebo-controlled study. Am J Psychiatry. April 2018; Epub ahead of print.

14. Gálvez V, Li A, Huggins C, et al. Repeated intranasal ketamine for treatment-resistant depression – the way to go? Results from a pilot randomised controlled trial. J Clin Psychopharmacol. 2018;32:397-407.

15. Ehrich E, Turncliff R, Du Y, et al. Evaluation of opioid modulation in major depressive disorder. Neuropsychopharmacol. 2015;40:1448-1455.

16. Fava M, Memisoglu A, Thase ME, et al. Opioid modulation with buprenorphine/samidorphan as adjunctive treatment for inadequate response to antidepressants: a randomized double-blind placebo-controlled trial. Am J Psychiatry. 2016;173:499-508.

17. Köhler O, Benros ME, Nordentoft M, et al. Effect of anti-inflammatory treatment on depression, depressive symptoms, and adverse effects: a systematic review and meta-analysis of randomized clinical trials. JAMA Psychiatry. 2014;71:1381-1391.

18. Uher R, Tansey KE, Dew T, et al. An inflammatory biomarker as a differential predictor of outcome of depression treatment with escitalopram and nortriptyline. Am J Psychiatry. 2014;171:1278-1286.

19. Papakostas GI, Shelton RC, Zajecka JM, et al. Effect of adjunctive L-methylfolate 15 mg among inadequate responders to SSRIs in depressed patients who were stratified by biomarker levels and genotype: results from a randomized clinical trial. J Clin Psychiatry. 2014;75:855-863.

20. Raison CL, Rutheford RE, Woolwine BJ, et al. A randomized controlled trial of the tumor necrosis factor antagonist infliximab for treatment-resistant depression: the role of baseline inflammatory biomarkers. JAMA Psychiatry. 2013;70:31-41.

21. Rosenblat JD, McIntyre RS. Efficacy and tolerability of minocycline for depression: a systematic review and meta-analysis of clinical trials. J Affect Disord. 2018;227:219-225.

22. Drevets WC, Zarate CA Jr, Furey ML. Antidepressant effects of the muscarinic cholinergic antagonist scopolamine: a review. Biol Psychiatry. 2013;73:1156-1163.

23. Furey ML Pietrini P, Haxby JV, et al. Selective effects of cholinergic modulation on task performance during selective attention. Neuropsychopharmacol 2008; 33:913-923.

24. Kanes S, Colquohoun H, Grunduz-Bruce H, et al. Brexanolone (SAGE-547 injection) in post-partum depression: a randomised controlled trial. Lancet. 2017;390:480-489.

25. Colle R, de Larminat D, Rotenberg S, et al. Pioglitazone could induce remission in major depression: a meta-analysis. Neuropsychiatr Dis Treat 2016;13: 9-16.

26.Yang CC, Barrós-Loscertales A, Pinazo D, et al. State and training effects of mindfulness meditation on brain networks reflect neuronal mechanisms of its antidepressant effect. Neural Plast. 2016;2016:9504642.

27. Koch JM, Hinze-Selch D, Stingele K, et al. Changes in CREB phosphorylation and BDNF plasma levels during psychotherapy of depression. Psychother Psychosom. 2009;78:187-192.

28. ECNP Neuroscience Applied. Neuroscience-based Nomenclature. https://www.ecnp.eu/research-innovation/nomenclature.aspx. Accessed June 6, 2018.

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Ketamine for Chronic Pain & Depression

Intravenous Ketamine is proving to be a tremendous treatment for intractable depression as well as chronic pain.  About half the patients treated respond positively with results lasting up to a week in most of the responders.

It has emerged as a treatment option for a variety of chronic pain conditions including fibromyalgia, small fiber neuropathy, Complex Regional Pain Syndrome (CRPS), Reflex Sympathetic Dystrophy (RSD) and psychiatric conditions including depression, Post Traumatic Stress Disorder (PTSD), suicidal ideation, and Obsessive-Compulsive Disorder (OCD).

Ketamine in the News

Remarkable secrets of ketamine’s antidepressant effect unlocked by scientists

Could Party Drug Ketamine Be a Treatment for Depression?

‘The fog is gone’: How ketamine could help lift hard-to-treat depression

Ketamine Research

Ketamine for Depression, 1: Clinical Summary of Issues Related to Efficacy, Adverse Effects, and Mechanism of Action.

Ketamine safety and tolerability in clinical trials for treatment-resistant depression.

Low-dose ketamine for treatment resistant depression in an academic clinical practice setting.

Symptomatology and predictors of antidepressant efficacy in extended responders to a single ketamine infusion.

How does ketamine elicit a rapid antidepressant response?

The use of ketamine as an antidepressant: a systematic review and meta-analysis.

Ketamine for rapid reduction of suicidal ideation: a randomized controlled trial.

Do the dissociative side effects of ketamine mediate its antidepressant effects?

Rapid and longer-term antidepressant effects of repeated ketamine infusions in treatment-resistant major depression.

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Reasons to treat depression rapidly – Depression causes rapid aging> Consider using a rapid – acting antidepressant!

Depression ‘makes us biologically older’  BBC Article

Major depressive disorder and accelerated cellular aging

Patients with major depressive disorder (MDD) have an increased onset risk of aging-related somatic diseases such as heart disease,
diabetes, obesity and cancer. This suggests mechanisms of accelerated biological aging among the depressed, which can be
indicated by a shorter length of telomeres. We examine whether MDD is associated with accelerated biological aging, and whether
depression characteristics such as severity, duration, and psychoactive medication do further impact on biological aging. Data are
from the Netherlands Study of Depression and Anxiety, including 1095 current MDD patients, 802 remitted MDD patients and 510
control subjects. Telomere length (TL) was assessed as the telomere sequence copy number (T) compared to a single-copy gene
copy number (S) using quantitative polymerase chain reaction. This resulted in a T/S ratio and was converted to base pairs (bp).
MDD diagnosis and MDD characteristics were determined by self-report questionnaires and structured psychiatric interviews.
Compared with control subjects (mean bp = 5541), sociodemographic-adjusted TL was shorter among remitted MDD patients
(mean bp = 5459; P = 0.014) and current MDD patients (mean bp = 5461; P = 0.012). Adjustment for health and lifestyle variables did
not reduce the associations. Within the current MDD patients, separate analyses showed that both higher depression severity
(P<0.01) and longer symptom duration in the past 4 years (P = 0.01) were associated with shorter TL. Our results demonstrate that
depressed patients show accelerated cellular aging according to a ‘dose–response’ gradient: those with the most severe and
chronic MDD showed the shortest TL. We also confirmed the imprint of past exposure to depression, as those with remitted MDD
had shorter TL than controls

In this large cohort study we demonstrated that currently
depressed persons had shorter TL than never-depressed controls.
Based on an estimated mean telomere shortening rate of 14–20
bp per year as found in this and other studies,20,23,26 the
differences observed indicate 4–6 years of accelerated aging for
the current MDD sample as compared to controls. We also showed
evidence for the imprint of past exposure to depression since
those with remitted MDD also had shorter TL than control
subjects. These observed associations remained significant after
controlling for lifestyle and somatic health variables, suggesting that the shortened telomeres were not simply due to unhealthylifestyle or poorer somatic health among depressed persons.
Finally, the association between MDD and TL showed a ‘dose–
response’ gradient, since the most severely and chronically
depressed patients had the shortest telomeres.

MDD is thus associated with shortened TL, which resembles
accelerated biological aging. The disorder has previously also been
associated with dysregulations of the hypothalamus–pituitary–
adrenal (HPA) axis,43,45 the immune system,46,47 the autonomic
nervous system (ANS)48,49 and increased oxidative stress.50
Shortened telomeres, in turn, are suggested to be a consequence
or a concomitant of these dysregulated biological stress systems.
In line with this, several in vitro and in vivo studies found increased
cortisol,51 oxidative stress52 and pro-inflammatory cytokines53
to be associated with shorter TL. Dysregulations of these stress systems could contribute to telomere shortening in MDD patients.9,12
However, the exact biological mechanisms that mediate the relation
between depression and telomere shortening, as well as the
direction of the link, remain to be further explored.

Oxidative stress shortens telomeres

Elevated DNA Oxidation and DNA Repair Enzyme Expression in Brain White Matter in Major Depressive Disorder.

The Role of Oxidative Stress in Depressive Disorders

Abstract:

Studies of the World Health Organization suggest that in the year 2020, depressive disorder will be the illness with the highest
burden of disease. Especially unipolar depression is the psychiatric disorder with the highest prevalence and incidence, it is cost-intensive and has a relatively high morbidity. Lately, the biological process involved in the aetiology of depression has been the focus of research.
Since its emergence, the monoamine hypothesis has been adjusted and extended considerably. An increasing body of evidence points to
alterations not only in brain function, but also in neuronal plasticity. The clinical presentations demonstrate these dysfunctions by accompanying cognitive symptoms such as problems with memory and concentration. Modern imaging techniques show volume reduction of the hippocampus and the frontal cortex. These findings are in line with post-mortem studies of patients with depressive disorder and they point to a significant decrease of neuronal and glial cells in cortico-limbic regions which can be seen as a consequence of alterations in
neuronal plasticity in this disorder. This could be triggered by an increase of free radicals which in turn eventually leads to cell death and consequently atrophy of vulnerable neuronal and glial cell population in these regions. Therefore, research on increased oxidative stress in unipolar depressive disorder, mediated by elevated concentrations of free radicals, has been undertaken. This review gives a comprehensive overview over the current literature discussing the involvement of oxidative stress and free radicals in depression.

Membrane damage in blood of patients with depression has
been shown by elevated of omega 3- fatty-acids [45] and by increased
lipid peroxidation products in patients with DD [42, 45,
[46, 47]. Furthermore, DNA-strand brakes have been reported in
the blood of these patients [48]. DD has been linked to increased
serum levels of malondialdehyde (MDA), a breakdown product of
oxidized apolipoprotein B-containing lipoproteins, and thus a
marker of the rate of peroxide breakdown [49, 50].

In patients with DD (Depressive Disorders), elevated levels of MDA adversely affect
the efficiency of visual-spatial and auditory-verbal working memory,
short-term declarative memory and delayed recall declarative
memory [51]. Higher concentration of plasma MDA in patients
with recurrent depression is associated with the severity of depressive
symptoms, both at the beginning of antidepressant pharmacotherapy,
and after 8 weeks of treatment. Statistically significant
differences were found in the intensity of depressive symptoms,
measured on therapy onset versus the examination results after
8 weeks of treatment [51]. Although this is used as a marker of lipid peroxidation, it is considered to be less stable than 8-iso-PGF2a, and more susceptible to confounding factors such as antioxidants from diet [52]. Therefore, the best way to investigate oxidative disruptions to lipids in humans is via assessing levels of F2-
isoprostanes [52-54]. These are stable compounds produced in the
process of lipid peroxidation [52, 54]. 8-iso-PGF2a are specific F2-
isoprostane molecules produced during the peroxidation of arachnidonic acid. However, the mean serum level of 8-iso-PGF2a was shown to be significantly higher in a group of patients with DD,
controlling for lifestyle variables such as body mass index, alcohol
consumption, and physical activity [55, 56]. Cerebral membrane
abnormalities and altered membrane phospholipids have been suggested by an increased choline-containing compound seen in the
putamen of patients with DD [57] which has been interpreted as a
result of increased oxidative stress in patients with DD.

A Meta-Analysis of Oxidative Stress Markers in Depression

Results
115 articles met the inclusion criteria. Lower TAC was noted in acute episodes (AEs) of depressed patients (p<0.05). Antioxidants, including serum paraoxonase, uric acid, albumin,
high-density lipoprotein cholesterol and zinc levels were lower than controls (p<0.05); the serum uric acid, albumin and vitamin C levels were increased after antidepressant therapy
(p<0.05). Oxidative damage products, including red blood cell (RBC) malondialdehyde (MDA), serum MDA and 8-F2-isoprostanes levels were higher than controls (p<0.05). After
antidepressant medication, RBC and serum MDA levels were decreased (p<0.05). Moreover, serum peroxide in free radicals levels were higher than controls (p<0.05). There were
no difference

Conclusion
This meta-analysis supports the facts that the serum TAC, paraoxonase and antioxidant levels are lower, and the serum free radical and oxidative damage product levels are higher
than controls in depressed patients. Meanwhile, the antioxidant levels are increased and the oxidative damage product levels are decreased after antidepressant medication. The
pathophysiological relationships between oxidative stress and depression, and the potential benefits of antioxidant supplementation deserve further research.

Some studies have demonstrated that depressed patients’ oxidative product levels in their peripheral blood [3, 4], red blood cells (RBC) [4], mononuclear cells [5], urine [6], cerebrospinal
fluid [7] and postmortem brains [8] were abnormal. Antioxidant system disturbance in peripheral blood has also been reported [9]. Autoimmune responses against neoepitopes
induced by oxidative damage of fatty acid and protein membranes have been reported [10, 11].
Lower glutathione (GSH) levels [12] and a negative relationship between anhedonia severity
and occipital GSH levels [13] were found through magnetic resonance spectroscopy (MRS).

Oxidative stress is defined as a persistent imbalance between oxidation and anti-oxidation, which leads to the damage of cellular macromolecules [14, 15]. The free radicals consist of reactive
oxygen species (ROS) and reactive nitrogen species (RNS). The main ROS includes superoxide anion, hydroxy radical and hydrogen peroxide, and the RNS consists of nitric oxide
(NO), nitrogen dioxide and peroxynitrite. Nitrite is often used as a marker of NO activity. Interestingly, the brain appears to be more susceptible to the ROS/RNS because of the high
content of unsaturated fatty acids, high oxygen consumption per unit weight, high content of key ingredients of lipid peroxidation (LP) and scarcity of antioxidant defence systems [16].
The oxidative products include products of oxidative damage of LP, protein and DNA in depression. As a product of LP, abnormal malondialdehyde (MDA) levels in depression have
been reported [17]. 8-F2-isoprostane (8-iso-PGF2α) is another product of LP [18] that is considered
to be a marker of LP because of its chemical stability [19]. The protein carbonyl (PC), 8-hydroxy-2-deoxyguanosine (8-OHdG) and 8-oxo-7, 8-dihydroguanosine (8-oxoGuo) are
the markers of protein, DNA and RNA oxidative damage, respectively [3, 20, 21]. The oxidative damage to cellular macromolecules changes the structure of original epitopes, which leads to the generation of new epitopes modified (neoepitopes). The antibodies against oxidative neoepitopes
in depression have been found [10, 11, 22–24]. On the other hand, the antioxidant defence systems can be divided into enzymatic and non-enzymatic antioxidants. The nonenzymatic
antioxidants include vitamins C and E, albumin, uric acid, high-density lipoprotein cholesterol (HDL-C), GSH, coenzyme Q10 (CoQ10), ceruloplasmin, zinc, selenium, and so on.
The enzymatic antioxidants include superoxide dismutase (SOD), glutathione peroxidase (GPX), catalase (CAT), glutathione reductase (GR), paraoxonase 1 (PON1), and so on.

Discussion
The present findings support oxidative stress may be disordered in depressed patients, which is demonstrated by abnormal oxidative stress marker levels. In this meta-analysis, at first we
found in depressed patients: 1) the serum TAC, PON, uric acid, albumin, HDL-C and zinc levels were lower than controls; 2) the serum peroxide, MDA, 8-iso-PGF2α and RBC MDA levels
were higher than controls. To explore the effect of the antidepressant therapy to oxidative stress
markers, we reviewed the studies which had changes. And it came to the conclusions: 1) the serum uric acid, albumin, and vitamin C levels were increased; 2) the serum nitrite, RBC and
serum MDA levels were decreased.

The serum antioxidant levels are significantly lower in depression in our study and previous
reports, including PON, albumin, zinc, uric acid HDL-C, CoQ10 [146] and GSH [4, 38].
Meanwhile, the oxidative damage product levels are significantly higher. The body couldn’t
scavenge the excess free radicals (peroxide), leading to damages of main parts of cellular macromolecules
such as fatty acids, protein, DNA, RNA and mitochondria. The longitudinal antidepressant
therapy can reverse these abnormal oxidative stress parameters. It has proved
these phenomena occur in depression, such as increased levels of MDA, 8-iso-PGF2α, 8-oxoGuo
and 8-OHdG [3, 21]. Oxidative stress plays a crucial role in the pathophysiology of
depression. Some genes may be a potential factor. Lawlor et al (2007) reported the R allele of
PON1Q192R was associated with depression [147]. In addition, poor appetite, psychological
stressors, obesity, metabolic syndrome, sleep disorders, cigarette smoking and unhealthy lifestyle
may also contribute to it [148]. Furthermore, oxidative stress activates the immuneinflammatory
pathways [148]. But some studies supported decrease in albumin, zinc and
HDL-C levels was probably related to increased levels of pro-inflammatory cytokines (such as
interleukin-1 (IL-1) and IL-6) [59, 70–72, 117] during an acute phase response, which illustrated the activated immune-inflammatory pathways also activates the oxidative stress. These two mechanisms influence each other. On the other hand, the oxidative damage to cellular macromolecules changes the structure of original epitopes, which leads to generation of newepitopes modified (neoepitopes). Oxidative neoepitopes reported up to now include the conjugated oleic and azelaic acid, MDA, phosphatidyl inositol (Pi), NO-modified adducts and oxidized low density lipoprotein (oxLDL) [11, 22–24]. Maes et al reported the levels of serum IgG antibody against the oxLDL and IgM antibodies against the conjugated oleic and azelaic acid, MDA, Pi and NO-modified adducts were increased in depression [11, 22–24]. Depleted antioxidant defence in depression suggests that antioxidant supplements may be useful in clinical management. Preliminary evidence has indicated that patients treated with CoQ10 showed improvement in depressive symptoms and decrease in hippocampal oxidative DNA damage [149]. In our analyses, vitamin C and E levels did not differ between depressed patients and controls, but many studies have reported that vitamin C and E supplements could improve depressive moods [150, 151].

Malondialdehyde plasma concentration correlates with declarative and working memory in patients with recurrent depressive disorder

Abstract

Oxidative stress has been implicated in the cognitive decline, especially in memory impairment. The purpose of this study was to determine the concentration of malondialdehyde (MDA) in patients with recurrent depressive disorders (rDD) and to define relationship between plasma levels of MDA and the cognitive performance. The study comprised 46 patients meeting criteria for rDD. Cognitive function assessment was based on: The Trail Making Test , The Stroop Test, Verbal Fluency Test and Auditory-Verbal Learning Test. The severity of depression symptoms was assessed using the Hamilton Depression Rating Scale (HDRS). Statistically significant differences were found in the intensity of depression symptoms, measured by the HDRS on therapy onset versus the examination results after 8 weeks of treatment (P < 0.001). Considering the 8-week pharmacotherapy period, rDD patients presented better outcomes in cognitive function tests. There was no statistically significant correlation between plasma MDA levels, and the age, disease duration, number of previous depressive episodes and the results in HDRS applied on admission and on discharge. Elevated levels of MDA adversely affected the efficiency of visual-spatial and auditory-verbal working memory, short-term declarative memory and the delayed recall declarative memory. 1. Higher concentration of plasma MDA in rDD patients is associated with the severity of depressive symptoms, both at the beginning of antidepressants pharmacotherapy, and after 8 weeks of its duration. 2. Elevated levels of plasma MDA are related to the impairment of visual-spatial and auditory-verbal working memory and short-term and delayed declarative memory.

Antioxidant /Antidepressant-like Effect of Ascorbic acid (Vitamine
C) and Fluoxetine
Another study investigated the influence of ascorbic acid
(which is an antioxidant with antidepressant-like effects in animals)
on both depressive-like behaviour induced by a chronic unpredictable
stress (CUS) paradigm and on serum markers of oxidative
stress and in cerebral cortex and hippocampus of mice [120]. The
CUS-model is an animal model for induced depression-like behaviour
in animals. Depressive-like behaviour induced by CUS was
accompanied by significantly increased lipid peroxidation (cerebral
cortex and hippocampus), decreased catalase (CAT) (cerebral cortex
and hippocampus) and glutathione reductase (GR) (hippocampus)
activities and reduced levels of glutathione (cerebral cortex).
Repeated ascorbic acid as well as fluoxetine administration significantly
reversed CUS-induced depressive-like behaviour as well as
oxidative damage. No alterations were observed in locomotor activity
and glutathione peroxidase (GPx) activity in the same sample.
These findings pointed to a rapid and robust effect of ascorbic acid
in reversing behavioural and biochemical alterations induced in an
animal model [120].  Ascorbic acid treatment, similarly to fluoxetine, reverses depressive-like behavior and brain oxidative damage induced by chronic unpredictable stress.

 

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Ketamine and Psychedelic Drugs Change Structure of Neurons

ummary: A new study reveals psychedelics increase dendrites, dendritic spines and synapses, while ketamine may promote neuroplasticity. The findings could help develop new treatments for anxiety, depression and other related disorders.

Source: UC Davis.

A team of scientists at the University of California, Davis is exploring how hallucinogenic drugs impact the structure and function of neurons — research that could lead to new treatments for depression, anxiety, and related disorders. In a paper published on June 12 in the journal Cell Reports, they demonstrate that a wide range of psychedelic drugs, including well-known compounds such as LSD and MDMA, increase the number of neuronal branches (dendrites), the density of small protrusions on these branches (dendritic spines), and the number of connections between neurons (synapses). These structural changes suggest that psychedelics are capable of repairing the circuits that are malfunctioning in mood and anxiety disorders.

“People have long assumed that psychedelics are capable of altering neuronal structure, but this is the first study that clearly and unambiguously supports that hypothesis. What is really exciting is that psychedelics seem to mirror the effects produced by ketamine,” said David Olson, assistant professor in the Departments of Chemistry and of Biochemistry and Molecular Medicine, who leads the research team.

Ketamine, an anesthetic, has been receiving a lot of attention lately because it produces rapid antidepressant effects in treatment-resistant populations, leading the U.S. Food and Drug Administration to fast-track clinical trials of two antidepressant drugs based on ketamine. The antidepressant properties of ketamine may stem from its tendency to promote neural plasticity — the ability of neurons to rewire their connections.

“The rapid effects of ketamine on mood and plasticity are truly astounding. The big question we were trying to answer was whether or not other compounds are capable of doing what ketamine does,” Olson said.

Psychedelics show similar effects to ketamine

Olson’s group has demonstrated that psychedelics mimic the effects of ketamine on neurons grown in a dish, and that these results extend to structural and electrical properties of neurons in animals. Rats treated with a single dose of DMT — a psychedelic compound found in the Amazonian herbal tea known as ayahuasca — showed an increase in the number of dendritic spines, similar to that seen with ketamine treatment. DMT itself is very short-lived in the rat: Most of the drug is eliminated within an hour. But the “rewiring” effects on the brain could be seen 24 hours later, demonstrating that these effects last for some time.

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Ketamine and Psychedelic Drugs Change Structure of Neurons

Summary: A new study reveals psychedelics increase dendrites, dendritic spines and synapses, while ketamine may promote neuroplasticity. The findings could help develop new treatments for anxiety, depression and other related disorders.

Source: UC Davis.

A team of scientists at the University of California, Davis is exploring how hallucinogenic drugs impact the structure and function of neurons — research that could lead to new treatments for depression, anxiety, and related disorders. In a paper published on June 12 in the journal Cell Reports, they demonstrate that a wide range of psychedelic drugs, including well-known compounds such as LSD and MDMA, increase the number of neuronal branches (dendrites), the density of small protrusions on these branches (dendritic spines), and the number of connections between neurons (synapses). These structural changes suggest that psychedelics are capable of repairing the circuits that are malfunctioning in mood and anxiety disorders.

“People have long assumed that psychedelics are capable of altering neuronal structure, but this is the first study that clearly and unambiguously supports that hypothesis. What is really exciting is that psychedelics seem to mirror the effects produced by ketamine,” said David Olson, assistant professor in the Departments of Chemistry and of Biochemistry and Molecular Medicine, who leads the research team.

Ketamine, an anesthetic, has been receiving a lot of attention lately because it produces rapid antidepressant effects in treatment-resistant populations, leading the U.S. Food and Drug Administration to fast-track clinical trials of two antidepressant drugs based on ketamine. The antidepressant properties of ketamine may stem from its tendency to promote neural plasticity — the ability of neurons to rewire their connections.

“The rapid effects of ketamine on mood and plasticity are truly astounding. The big question we were trying to answer was whether or not other compounds are capable of doing what ketamine does,” Olson said.

Psychedelics show similar effects to ketamine

Olson’s group has demonstrated that psychedelics mimic the effects of ketamine on neurons grown in a dish, and that these results extend to structural and electrical properties of neurons in animals. Rats treated with a single dose of DMT — a psychedelic compound found in the Amazonian herbal tea known as ayahuasca — showed an increase in the number of dendritic spines, similar to that seen with ketamine treatment. DMT itself is very short-lived in the rat: Most of the drug is eliminated within an hour. But the “rewiring” effects on the brain could be seen 24 hours later, demonstrating that these effects last for some time.

image shows neurons under psychedelics and ketamine

Psychedelic drugs such as LSD and ayahuasca change the structure of nerve cells, causing them to sprout more branches and spines, UC Davis researchers have found. This could help in “rewiring” the brain to treat depression and other disorders. In this false-colored image, the rainbow-colored cell was treated with LSD compared to a control cell in blue. NeuroscienceNews.com image is credited to Calvin and Joanne Ly.

Behavioral studies also hint at the similarities between psychedelics and ketamine. In another recent paper published in ACS Chemical Neuroscience, Olson’s group showed that DMT treatment enabled rats to overcome a “fear response” to the memory of a mild electric shock. This test is considered to be a model of post-traumatic stress disorder (PTSD), and interestingly, ketamine produces the same effect. Recent clinical trials have shown that like ketamine, DMT-containing ayahuasca might have fast-acting effects in people with recurrent depression, Olson said.

These discoveries potentially open doors for the development of novel drugs to treat mood and anxiety disorders, Olson said. His team has proposed the term “psychoplastogen” to describe this new class of “plasticity-promoting” compounds.

“Ketamine is no longer our only option. Our work demonstrates that there are a number of distinct chemical scaffolds capable of promoting plasticity like ketamine, providing additional opportunities for medicinal chemists to develop safer and more effective alternatives,” Olson said.

 

Psychedelic drugs, ketamine change structure of neurons

Psychedelic drugs, ketamine change structure of neurons

Psychedelics as Possible Treatments for Depression and PTSD

A team of scientists at the University of California, Davis, is exploring how hallucinogenic drugs impact the structure and function of neurons — research that could lead to new treatments for depression, anxiety and related disorders.

In a paper published on June 12 in the journal Cell Reports, they demonstrate that a wide range of psychedelic drugs, including well-known compounds such as LSD and MDMA, increase the number of neuronal branches (dendrites), the density of small protrusions on these branches (dendritic spines) and the number of connections between neurons (synapses). These structural changes could suggest that psychedelics are capable of repairing the circuits that are malfunctioning in mood and anxiety disorders.

“People have long assumed that psychedelics are capable of altering neuronal structure, but this is the first study that clearly and unambiguously supports that hypothesis. What is really exciting is that psychedelics seem to mirror the effects produced by ketamine,” said David Olson, assistant professor in the departments of Chemistry and of Biochemistry and Molecular Medicine, who leads the research team.

Ketamine, an anesthetic, has been receiving a lot of attention lately because it produces rapid antidepressant effects in treatment-resistant populations, leading the U.S. Food and Drug Administration to fast-track clinical trials of two antidepressant drugs based on ketamine. The antidepressant properties of ketamine may stem from its tendency to promote neural plasticity — the ability of neurons to rewire their connections.

“The rapid effects of ketamine on mood and plasticity are truly astounding. The big question we were trying to answer was whether or not other compounds are capable of doing what ketamine does,” Olson said.

Psychedelics show similar effects to ketamine

Olson’s group has demonstrated that psychedelics mimic the effects of ketamine on neurons grown in a dish, and that these results extend to structural and electrical properties of neurons in animals. Rats treated with a single dose of DMT — a psychedelic compound found in the Amazonian herbal tea known as ayahuasca — showed an increase in the number of dendritic spines, similar to that seen with ketamine treatment. DMT itself is very short-lived in the rat: Most of the drug is eliminated within an hour. But the “rewiring” effects on the brain could be seen 24 hours later, demonstrating that these effects last for some time.

Behavioral studies also hint at the similarities between psychedelics and ketamine. In another recent paper published in ACS Chemical Neuroscience, Olson’s group showed that DMT treatment enabled rats to overcome a “fear response” to the memory of a mild electric shock. This test is considered to be a model of post-traumatic stress disorder, or PTSD, and interestingly, ketamine produces the same effect. Recent clinical trials have shown that like ketamine, DMT-containing ayahuasca might have fast-acting effects in people with recurrent depression, Olson said.

These discoveries potentially open doors for the development of novel drugs to treat mood and anxiety disorders, Olson said. His team has proposed the term “psychoplastogen” to describe this new class of “plasticity-promoting” compounds.

“Ketamine is no longer our only option. Our work demonstrates that there are a number of distinct chemical scaffolds capable of promoting plasticity like ketamine, providing additional opportunities for medicinal chemists to develop safer and more effective alternatives,” Olson said.

Additional co-authors on the Cell Reports “Psychedelics Promote Structural and Functional Neural Plasticity.” study are Calvin Ly, Alexandra Greb, Sina Soltanzadeh Zarandi, Lindsay Cameron, Jonathon Wong, Eden Barragan, Paige Wilson, Michael Paddy, Kassandra Ori-McKinney, Kyle Burbach, Megan Dennis, Alexander Sood, Whitney Duim, Kimberley McAllister and John Gray.

Olson and Cameron were co-authors on the ACS Chemical Neuroscience paper along with Charlie Benson and Lee Dunlap.

The work was partly supported by grants from the National Institutes of Health.

Psychedelics Promote Structural and Functional
Neural Plasticity

Below is the Intro and Discussion for the article:

Psychedelics Promote Structural and Functional neural Plasticity

Authors:

Calvin Ly, Alexandra C. Greb,
Lindsay P. Cameron, …,
Kassandra M. Ori-McKenney,
John A. Gray, David E. Olson
Correspondence
deolson@ucdavis.edu

In Brief
Ly et al. demonstrate that psychedelic
compounds such as LSD, DMT, and DOI
increase dendritic arbor complexity,
promote dendritic spine growth, and
stimulate synapse formation. These
cellular effects are similar to those
produced by the fast-acting
antidepressant ketamine and highlight
the potential of psychedelics for treating
depression and related disorders.

  • Highlights
     Serotonergic psychedelics increase neuritogenesis,
    spinogenesis, and synaptogenesis
  •  Psychedelics promote plasticity via an evolutionarily
    conserved mechanism
  •  TrkB, mTOR, and 5-HT2A signaling underlie psychedelicinduced
    plasticity
  •  Noribogaine, but not ibogaine, is capable of promoting
    structural neural plasticity

SUMMARY
Atrophy of neurons in the prefrontal cortex (PFC)
plays a key role in the pathophysiology of depression
and related disorders. The ability to promote
both structural and functional plasticity in the PFC
has been hypothesized to underlie the fast-acting
antidepressant properties of the dissociative anesthetic
ketamine. Here, we report that, like ketamine,
serotonergic psychedelics are capable of robustly
increasing neuritogenesis and/or spinogenesis both
in vitro and in vivo. These changes in neuronal structure
are accompanied by increased synapse number
and function, as measured by fluorescence microscopy
and electrophysiology. The structural changes
induced by psychedelics appear to result from stimulation
of the TrkB, mTOR, and 5-HT2A signaling
pathways and could possibly explain the clinical
effectiveness of these compounds. Our results underscore
the therapeutic potential of psychedelics
and, importantly, identify several lead scaffolds for
medicinal chemistry efforts focused on developing
plasticity-promoting compounds as safe, effective,
and fast-acting treatments for depression and
related disorders.

INTRODUCTION
Neuropsychiatric diseases, including mood and anxiety disorders,
are some of the leading causes of disability worldwide
and place an enormous economic burden on society (Gustavsson
et al., 2011; Whiteford et al., 2013). Approximately
one-third of patients will not respond to current antidepressant
drugs, and those who do will usually require at least 2–4 weeks
of treatment before they experience any beneficial effects
(Rush et al., 2006). Depression, post-traumatic stress disorder
(PTSD), and addiction share common neural circuitry (Arnsten,
2009; Russo et al., 2009; Peters et al., 2010; Russo and
Nestler, 2013) and have high comorbidity (Kelly and Daley,
2013). A preponderance of evidence from a combination of
human imaging, postmortem studies, and animal models suggests
that atrophy of neurons in the prefrontal cortex (PFC)
plays a key role in the pathophysiology of depression and
related disorders and is precipitated and/or exacerbated by
stress (Arnsten, 2009; Autry and Monteggia, 2012; Christoffel
et al., 2011; Duman and Aghajanian, 2012; Duman et al.,
2016; Izquierdo et al., 2006; Pittenger and Duman, 2008;
Qiao et al., 2016; Russo and Nestler, 2013). These structural
changes, such as the retraction of neurites, loss of dendritic
spines, and elimination of synapses, can potentially be counteracted
by compounds capable of promoting structural and
functional neural plasticity in the PFC (Castre´ n and Antila,
2017; Cramer et al., 2011; Duman, 2002; Hayley and Litteljohn,
2013; Kolb and Muhammad, 2014; Krystal et al., 2009;
Mathew et al., 2008), providing a general solution to treating
all of these related diseases. However, only a relatively small
number of compounds capable of promoting plasticity in the
PFC have been identified so far, each with significant drawbacks
(Castre´ n and Antila, 2017). Of these, the dissociative
anesthetic ketamine has shown the most promise, revitalizing
the field of molecular psychiatry in recent years.
Ketamine has demonstrated remarkable clinical potential as a
fast-acting antidepressant (Berman et al., 2000; Ionescu et al.,
2016; Zarate et al., 2012), even exhibiting efficacy in treatmentresistant
populations (DiazGranados et al., 2010; Murrough
et al., 2013; Zarate et al., 2006). Additionally, it has shown promise
for treating PTSD (Feder et al., 2014) and heroin addiction
(Krupitsky et al., 2002). Animal models suggest that its therapeutic
effects stem from its ability to promote the growth of dendritic
spines, increase the synthesis of synaptic proteins, and
strengthen synaptic responses (Autry et al., 2011; Browne and
Lucki, 2013; Li et al., 2010).

Like ketamine, serotonergic psychedelics and entactogens
have demonstrated rapid and long-lasting antidepressant and
anxiolytic effects in the clinic after a single dose (Bouso et al.,
2008; Carhart-Harris and Goodwin, 2017; Grob et al., 2011;
Mithoefer et al., 2013, 2016; Nichols et al., 2017; Sanches
et al., 2016; Oso´ rio et al., 2015), including in treatment-resistant
populations (Carhart-Harris et al., 2016, 2017; Mithoefer et al.,
2011; Oehen et al., 2013; Rucker et al., 2016). In fact, there
have been numerous clinical trials in the past 30 years examining
the therapeutic effects of these drugs (Dos Santos et al., 2016),
with 3,4-methylenedioxymethamphetamine (MDMA) recently
receiving the ‘‘breakthrough therapy’’ designation by the Food
and Drug Administration for treating PTSD. Furthermore, classical
psychedelics and entactogens produce antidepressant
and anxiolytic responses in rodent behavioral tests, such as
the forced swim test (Cameron et al., 2018) and fear extinction
learning (Cameron et al., 2018; Catlow et al., 2013; Young
et al., 2015), paradigms for which ketamine has also been shown
to be effective (Autry et al., 2011; Girgenti et al., 2017; Li et al.,
2010). Despite the promising antidepressant, anxiolytic, and
anti-addictive properties of serotonergic psychedelics, their
therapeutic mechanism of action remains poorly understood,
and concerns about safety have severely limited their clinical
usefulness.
Because of the similarities between classical serotonergic
psychedelics and ketamine in both preclinical models and clinical
studies, we reasoned that their therapeutic effects might
result from a shared ability to promote structural and functional
neural plasticity in cortical neurons. Here, we report that serotonergic
psychedelics and entactogens from a variety of chemical
classes (e.g., amphetamine, tryptamine, and ergoline) display
plasticity-promoting properties comparable to or greater than
ketamine. Like ketamine, these compounds stimulate structural
plasticity by activating the mammalian target of rapamycin
(mTOR). To classify the growing number of compounds capable
of rapidly promoting induced plasticity (Castre´ n and Antila,
2017), we introduce the term ‘‘psychoplastogen,’’ from the
Greek roots psych- (mind), -plast (molded), and -gen (producing).
Our work strengthens the growing body of literature indicating
that psychoplastogens capable of promoting plasticity
in the PFC might have value as fast-acting antidepressants
and anxiolytics with efficacy in treatment-resistant populations
and suggests that it may be possible to use classical psychedelics
as lead structures for identifying safer alternatives.

DISCUSSION
Classical serotonergic psychedelics are known to cause
changes in mood (Griffiths et al., 2006, 2008, 2011) and brain
function (Carhart-Harris et al., 2017) that persist long after the
acute effects of the drugs have subsided. Moreover, several
psychedelics elevate glutamate levels in the cortex (Nichols,
2004, 2016) and increase gene expression in vivo of the neurotrophin
BDNF as well as immediate-early genes associated with
plasticity (Martin et al., 2014; Nichols and Sanders-Bush, 2002;
Vaidya et al., 1997). This indirect evidence has led to the
reasonable hypothesis that psychedelics promote structural
and functional neural plasticity, although this assumption had
never been rigorously tested (Bogenschutz and Pommy,
2012; Vollenweider and Kometer, 2010). The data presented
here provide direct evidence for this hypothesis, demonstrating
that psychedelics cause both structural and functional changes
in cortical neurons.

Prior to this study, two reports suggested
that psychedelics might be able
to produce changes in neuronal structure.
Jones et al. (2009) demonstrated that DOI
was capable of transiently increasing the
size of dendritic spines on cortical neurons,
but no change in spine density was
observed. The second study showed
that DOI promoted neurite extension in a
cell line of neuronal lineage (Marinova
et al., 2017). Both of these reports utilized
DOI, a psychedelic of the amphetamine
class. Here we demonstrate that the ability
to change neuronal structure is not a
unique property of amphetamines like
DOI because psychedelics from the ergoline,
tryptamine, and iboga classes of compounds also promote
structural plasticity. Additionally, D-amphetamine does not increase
the complexity of cortical dendritic arbors in culture,
and therefore, these morphological changes cannot be simply
attributed to an increase in monoamine neurotransmission.
The identification of psychoplastogens belonging to distinct
chemical families is an important aspect of this work because
it suggests that ketamine is not unique in its ability to promote
structural and functional plasticity. In addition to ketamine, the
prototypical psychoplastogen, only a relatively small number of
plasticity-promoting small molecules have been identified previously.
Such compounds include the N-methyl-D-aspartate
(NMDA) receptor ligand GLYX-13 (i.e., rapastinel), the mGlu2/3
antagonist LY341495, the TrkB agonist 7,8-DHF, and the muscarinic
receptor antagonist scopolamine (Lepack et al., 2016; Castello
et al., 2014; Zeng et al., 2012; Voleti et al., 2013). We
observe that hallucinogens from four distinct structural classes
(i.e., tryptamine, amphetamine, ergoline, and iboga) are also
potent psychoplastogens, providing additional lead scaffolds
for medicinal chemistry efforts aimed at identifying neurotherapeutics.
Furthermore, our cellular assays revealed that several
of these compounds were more efficacious (e.g., MDMA) or more potent (e.g., LSD) than ketamine. In fact, the plasticity-promoting
properties of psychedelics and entactogens rivaled that
of BDNF (Figures 3A–3C and S3). The extreme potency of LSD
in particular might be due to slow off kinetics, as recently proposed
following the disclosure of the LSD-bound 5-HT2B crystal
structure (Wacker et al., 2017).
Importantly, the psychoplastogenic effects of psychedelics in
cortical cultures were also observed in vivo using both vertebrate
and invertebrate models, demonstrating that they act through an
evolutionarily conserved mechanism. Furthermore, the concentrations
of psychedelics utilized in our in vitro cell culture assays
were consistent with those reached in the brain following systemic
administration of therapeutic doses in rodents (Yang
et al., 2018; Cohen and Vogel, 1972). This suggests that neuritogenesis,
spinogenesis, and/or synaptogenesis assays performed
using cortical cultures might have value for identifying
psychoplastogens and fast-acting antidepressants. It should
be noted that our structural plasticity studies performed in vitro
utilized neurons exposed to psychedelics for extended periods
of time. Because brain exposure to these compounds is often
of short duration due to rapid metabolism, it will be interesting
to assess the kinetics of psychedelic-induced plasticity.
A key question in the field of psychedelic medicine has been
whether or not psychedelics promote changes in the density of
dendritic spines (Kyzar et al., 2017). Using super-resolution
SIM, we clearly demonstrate that psychedelics do, in fact, increase
the density of dendritic spines on cortical neurons, an effect
that is not restricted to a particular structural class of compounds.
Using DMT, we verified that cortical neuron spine
density increases in vivo and that these changes in structural
plasticity are accompanied by functional effects such as
increased amplitude and frequency of spontaneous EPSCs.

We specifically designed these experiments
to mimic previous studies of ketamine
(Li et al., 2010) so that we might
directly compare these two compounds,
and, to a first approximation, they appear
to be remarkably similar. Not only do they
both increase spine density and neuronal
excitability in the cortex, they seem to
have similar behavioral effects. We have
shown previously that, like ketamine,
DMT promotes fear extinction learning
and has antidepressant effects in the
forced swim test (Cameron et al., 2018). These results, coupled
with the fact that ayahuasca, a DMT-containing concoction, has
potent antidepressant effects in humans (Oso´ rio et al., 2015;
Sanches et al., 2016; Santos et al., 2007), suggests that classical
psychedelics and ketamine might share a related therapeutic
mechanism.
Although the molecular targets of ketamine and psychedelics
are different (NMDA and 5-HT2A receptors, respectively), they
appear to cause similar downstream effects on structural plasticity
by activating mTOR. This finding is significant because ketamine is
known to be addictive whereas many classical psychedelics are
not (Nutt et al., 2007, 2010). The exact mechanisms by which these
compounds stimulate mTOR is still not entirely understood, but
our data suggest that, at least for classical psychedelics, TrkB
and 5-HT2A receptors are involved. Although most classical psychedelics
are not considered to be addictive, there are still significant
safety concerns with their use in medicine because they
cause profound perceptual disturbances and still have the potential
to be abused. Therefore, the identification of non-hallucinogenic
analogs capable of promoting plasticity in the PFC could
facilitate a paradigm shift in our approach to treating neuropsychiatric
diseases. Moreover, such compounds could be critical to
resolving the long-standing debate in the field concerning whether
the subjective effects of psychedelics are necessary for their therapeutic
effects (Majic et al., 2015  ). Although our group is actively
investigating the psychoplastogenic properties of non-hallucinogenic
analogs of psychedelics, others have reported the therapeutic
potential of safer structural and functional analogs of ketamine
(Moskal et al., 2017; Yang et al., 2015; Zanos et al., 2016).
Our data demonstrate that classical psychedelics from several
distinct chemical classes are capable of robustly promoting the
growth of both neurites and dendritic spines in vitro, in vivo, and across species. Importantly, our studies highlight the similarities
between the effects of ketamine and those of classical serotonergic
psychedelics, supporting the hypothesis that the clinical
antidepressant and anxiolytic effects of these molecules might
result from their ability to promote structural and functional plasticity
in prefrontal cortical neurons. We have demonstrated that
the plasticity-promoting properties of psychedelics require
TrkB, mTOR, and 5-HT2A signaling, suggesting that these key
signaling hubs may serve as potential targets for the development
of psychoplastogens, fast-acting antidepressants, and anxiolytics.
Taken together, our results suggest that psychedelics
may be used as lead structures to identify next-generation neurotherapeutics
with improved efficacy and safety profiles.

Also below is a great article on DMT and neuroplasticity:

 

Dark Classics in Chemical Neuroscience N,N-Dimethyltryptamine DMT

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Ketamine Consultants Blog

Ketamine is a dissociative anesthetic that acts on the central nervous system by antagonizing the n-methyl-d-aspartate (NMDA) receptors. It is a rapid acting anti-depressant, but there is a lot more attention being paid to it’s efficacy in alcohol and drug abuse treatment.

Ketamine has been shown in some studies to prolong abstinence from alcohol and drug use disorders. It also has been found to reduce cocaine craving and self-administration in untreated patients.

The mechanisms by which this works has been through the disruption of relevant neural networks which blocks reconciliation of drug-related memories, neuroplasticity and neurogenesis, and enhancing psychological therapy.

We know that addiction is a chronic relapsing disorder with cravings, drug seeking, and unpleasant withdrawal symptoms upon cessation of the drug. Relapse rates with current therapies are between 40-80%.

Pre-clinical research on Ketamine has shown effectiveness in alcohol intake in a rat model:

Alcohol-preferring rats could self-administer
0.08% weight/volume saccharin, 10% weight/volume ethanol or
water. After intraperitoneal administration of either ketamine or
memantine, operant responding and motor activity were assessed.
A dose of 20 mg/kg of ketamine reduced ethanol administration
significantly (33.3% less than vehicle-treated rats) without affecting
motor activity and water consumption. Importantly, coadministration
of rapamycin blocked ketamine-mediated reduction
of alcohol intake, but not that of memantine (Sabino et al.,
2013). Similarly, ketamine’s antidepressant effects are suppressed
by rapamycin. mTOR activation is required for the anti-alcohol effect of ketamine, but not memantine, in alcohol-preferring rats

Also:

Both ketamine and NBQX attenuate alcohol drinking in male Wistar rats.

The devastating consequences of alcohol-use disorder (AUD) on the individual and the society are well established. Current treatments of AUD encompass various strategies, all of which have only modest effectiveness. Hence, there is a critical need to develop more efficacious therapies. Recently, specific glutamatergic receptors have been identified as potential novel targets for intervention in AUD. Thus, the current study was designed to evaluate the effects of acute administration of sub-anesthetic doses of ketamine, an NMDA receptor antagonist, as well as NBQX, an AMPA/kainate receptor antagonist on alcohol intake and its possible behavioural consequences. Adult male Wistar rats were trained in drinking in dark paradigm (3 weeks), and following stable alcohol intake, ketamine, NBQX as well as their combination were injected prior to a 90 min drinking session. In addition to alcohol intake, sucrose preference (overnight), and locomotor activity and forced swim test (FST) were also evaluated before and following alcohol intake. Both doses of ketamine (5 and 10 mg/kg) and NBQX (5 and 10 mg/kg) significantly attenuated percent alcohol intake. The combination of the higher dose of ketamine and NBQX, however, did not significantly affect percent alcohol intake. Moreover, animals exposed to alcohol showed decreased sucrose intake (reflective of anhedonia), decreased locomotor activity and swimming in the FST (reflective of helplessness), that were not affected by ketamine and/or NBQX. These results suggest that selective antagonism of the NMDA or AMPA/kainate receptors may be of therapeutic potential in AUD.

Addiction is characterised by disruptions in learning and memory. Addicts develop cue-specific responses to drug-related
cues. One preclinical study examined the effects of ketamine administration on reconsolidation
where memories are rendered more labile following reactivation. After morphine CPP ( conditioned place preference) was induced, rats were intraperitoneally administered 60 mg/kg of ketamine after being reexposed to the conditioned context or while they were in their home cages. After ketamine administration, preference for morphine decreased significantly in the first retest.  This has been interpreted as evidence that ketamine successfully disrupted reconsolidation of the environment-drug memory.

Effects of scopolamine and ketamine on reconsolidation of morphine conditioned place preference in rats

Persistent memory associated with addictive drugs contributes to the relapse of drug abuse. The current study was conducted to examine the effects of scopolamine and ketamine on reconsolidation of morphine-induced conditioned place preference (CPP). In experiment 1, after morphine CPP was acquired, rats were injected with ketamine (60 mg/kg, intraperitoneally) and scopolamine (2 mg/kg, intraperitoneally), respectively, after reexposure to an earlier morphine-paired context or in their home cages. The CPP was reassessed 24 and 48 h after reexposure. An additional group of rats received saline following reexposure to the earlier morphine-paired context. In experiment 2, two groups of rats were only given saline during the CPP training and subsequent administration of ketamine or scopolamine during the reexposure. In experiment 1, rats failed to exhibit morphine CPP when ketamine and scopolamine were administered only after reexposure to a morphine-paired context. CPP was not abolished by ketamine or scopolamine administration in the animals’ home cages. Also, the animals receiving only saline injections showed strong morphine CPP 24 h after a short exposure to the morphine-paired context. In experiment 2, ketamine or scopolamine treatment alone did not induce CPP or aversion. Administration of scopolamine and ketamine, after reexposure to a drug-paired context, resulted in the disruption of morphine CPP, suggesting the potential effects of scopolamine and ketamine in disrupting memory associated with environmental cues and addictive drugs.

The capacity of ketamine to treat addiction was not investigated scientifically until decades later when Krupitsky and
Grinenko (1997), published work that reported the use of ketamineto reduce relapse in recently detoxified alcoholics. These
published results were a review of 10 years of previous research.The procedure that was investigated was referred to as Ketamine Psychedelic Therapy (KPT) and had been applied since the mid-80sin the former Soviet Union, until ketamine was banned in Russia 1998.  Ten Year Study of Ketamine Psychedelic Therapy (KPT) of Alcohol Dependence [

KPT consisted of three stages. The first step was the preparation,during which patients underwent a preliminary psychotherapy session where a psychotherapist discussed with them the content of the psychedelic experience. They were told that under the influence of ketamine, they would view the world symbolically, realise about the negative aspects of alcohol dependence and see the positive sides of sobriety. They were also told that they would become aware of unconscious mental concepts about the negative aspects of their addiction, such as their personal problems and their self-identity. These insights would help them to accept new life values, purposes and meaning of life and in turn e to overcome
their alcoholism. The second stage was the ketamine session in which ketamine was intramuscularly injected and the psychotherapist interacted with the patient. The psychotherapist verbally guided the patient, with the aim of creating new meaning and purpose in life. At moments of highly intense psychedelic experience, the smell of alcohol was introduced to the individuals. The idea was to enhance the negative emotional valence of the thoughts related to alcohol during the session. Finally, group psychotherapy was performed after the session. The aim of this session was to help patients integrate
insights of psychedelic experience into their lives. It is reported that this procedure was used in
over 1000 alcoholics with no reported complications.In Krupitsky and Grinenko, 1997 report, relapse rates in a group
of recently detoxified alcohol dependent patients undergoing KPT (n ¼ 111) were compared with another group of alcohol dependent patients who were treated with treatment as usual (n ¼ 100). Both groups underwent alcohol detoxification before treatment. After these sessions, the KPT group received an intramuscular injection of ketamine (2.5 mg/kg) along with the corresponding preparation. The control group received ‘conventional, standard methods of treatment’ in the same hospital. Only 24% of the control group remained abstinent after a year, whereas 66% of the KPT group did not relapse during the same period (p < .01).

In a further study, 70 detoxified heroin-dependent patients were randomised into two KPT groups, who were injected different doses of ketamine, in a double-blind manner (Krupitsky et al., 2002). One group (n ¼ 35) received 0.2 mg/kg i.m. of ketamine, which was considered an active placebo, whereas the experimental group (n ¼ 35) received 2.0 mg/kg i.m. After two years, the higher dose of ketamine resulted in a greater rate of abstinence (17% vs 2% abstinent subjects, p < .05). Additionally, the experimental group had a larger positive change in nonverbal unconscious emotional attitudes and a greater and longer-lasting reduction in craving for heroin. The authors therefore concluded that effectiveness of ketamine
was dose dependent. Ketamine psychotherapy for heroin addiction: immediate effects and two-year follow-up

In 2007, Krupitsky’s lab compared the impact of a single vs three KPT sessions (dose: 2.0 mg/kg, i.m.) (Krupitsky et al., 2007). Fifty nine detoxified heroin dependent patients first received a KPT session. After this, 6 participants relapsed and abandoned the treatment. The remaining participants were randomised into two groups: one received a further two KPT sessions (n ¼ 26) in monthly intervals, whereas the other underwent two counseling sessions (n ¼ 27) also in monthly intervals. After a year, 50% in the 3-session KPT group remained abstinent compared to 22% in the single KPT (p < .05) (Krupitsky et al., 2007). This clearly demonstrates the superior efficacy of three KPT sessions in comparison to
one KPT session, which indicates that the KPT sessions are beneficial.  Single Versus Repeated Sessions of Ketamine-Assisted Psychotherapy for People with Heroin Dependence 

In a private psychiatric practice in the US, another psychiatrist has successfully conducted KPT since 1994. He has not only treated patients with drug addiction, but also individuals with other types of addictions (e.g. food addiction) and other psychological disorders. His reported anecdotal, clinical findings are positive, having adhered strictly to the original protocol.  Ketamine Enhanced Psychotherapy: Preliminary Clinical Observations on Its Effectiveness in Treating Alcoholism. Kolp, Eli,Friedman, Harris L.,Young, M. Scott,Krupitsky, Evgeny The Humanistic Psychologist, Vol 34(4), 2006, 399-422

Abstract:

Ketamine is a dissociative anesthetic widely used by physicians in the United States and also a psychedelic drug that physicians can legally prescribe off-label within the United States for other therapeutic purposes. It has been used in Russia and elsewhere to successfully treat alcoholism and other psychological or psychiatric problems, but has not been researched for this purpose in the United States. Results of a series of clinical trials using ketamine for treating alcoholism in the United States are retrospectively reported, along with 2 case studies of how psychotherapy facilitated by this substance helped two individuals achieve abstinence through ketamine’s transpersonal effects. Considering the massive problems caused by alcoholism, the need to begin formal research studies on ketamine psychotherapy for alcoholism is emphasized.

In 2014, 8 cocaine dependent males disinterested in treatment received 3 infusions in a double-blind, cross-over design: 0.41 mg/ kg ketamine, 0.71 mg/kg ketamine, and 2 mg lorazepam (an active benzodiazepine control, which induces mild subjective and anxiolytic effects) (Dakwar et al., 2014b). Infusions lasted 52 min and were separated by 48 h. Before and after each infusion, motivation to quit cocaine and cue-induced craving were assessed. Relative to the lorazepam, motivation to quit cocaine was enhanced and cueinduced craving for cocaine was reduced by the 0.4 mg/kg ketamine (both ps ¼ 0.012), and this latter effect was augmented by the 0.71 mg/kg ketamine dose. During the psychedelic experience,
dissociation and mystical-type effects were assessed. As predicted, the higher dose of ketamine led to greater mystical experiences. Strikingly, these mystical-type experiences, but not the dissociative effects, were found to mediate motivation to quit. However, the small non-treatment-seeking sample, the absence of an inactive placebo and the cross-over design, limit the results.Having said that, the participants showed a significant reduction in the frequency and amount of cocaine
consumed in normal life in the 4 weeks following the experiment, compared to baseline. Dakwar, E., Levin, F., Foltin, R.W., Nunes, E.V., Hart, C.L., 2014b. The effects of subanesthetic ketamine infusions on motivation to quit and cue-induced craving in cocaine-dependent research volunteers. Biol. Psychiatry 76, 40e46. https://doi. org/10.1016/j.biopsych.2013.08.009.

Also, more cocaine research from the same group is here:

Cocaine self-administration disrupted by the N-methyl-D-aspartate receptor antagonist ketamine: a randomized, crossover trial E DakwarMolecular Psychiatry volume22pages76–81 (2017) |

Abstract:

Repeated drug consumption may progress to problematic use by triggering neuroplastic adaptations that attenuate sensitivity to natural rewards while increasing reactivity to craving and drug cues. Converging evidence suggests a single sub-anesthetic dose of the N-methyl-D-aspartate receptor antagonist ketamine may work to correct these neuroadaptations and restore motivation for non-drug rewards. Using an established laboratory model aimed at evaluating behavioral shifts in the salience of cocaine now vs money later, we found that ketamine, as compared to the control, significantly decreased cocaine self-administration by 67% relative to baseline at greater than 24 h post-infusion, the most robust reduction observed to date in human cocaine users and the first to involve mechanisms other than stimulant or dopamine agonist effects. These findings signal new directions in medication development for substance use disorders.

Neural plasticity is defined as the cellular and structural reorganisation
of the brain. Synaptogenesis is a crucial mechanism for
plasticity, since for change to happen within brain circuitry new
synapses between neurons must be formed. Surface expression of
AMPARs and upregulation of other synaptic proteins are involved in
the process of synaptogenesis. Diminished glutamatergic synaptic
transmission and reduced plasticity are thought to be associated
with addiction. Existing models suggest that ketamine’s blockade of NMDA receptors
increases synaptogenesis by stimulating protein synthesis
and the insertion of AMPA receptors. Hence, ketamine’s
effects help to reverse the glutamatergic changes associated
with depression and addiction. 

Animal models of addiction, depression and other psychiatric disorders
have been linked to a reduction in adult neurogenesis . It has been suggested that in addiction
the loss of neurogenesis, especially in cortical and hippocampal
regions, may contribute to levels of self-administration and the
vulnerability of relapsing. The reduction of neurogenesis in addiction is supported in
humans by the reduction in BDNF serum levels. In a study, 37
subjects with diagnosis of alcohol dependence showed significantly
reduced BDNF serum levels compared to healthy individuals
. Similarly, cocaine- and heroin-dependentpatients have significantly lower serum BDNF levels and these
seem to recover during withdrawal. Rapid and transient up-regulation of the neuroplasticity marker
BDNF is implicated as a critical component of the antidepressant
mechanism of ketamine . BDNF knock-out mice do not show anti-depressant response to
ketamine in animal models of depression.

Recent research has
demonstrated that ketamine increases peripheral plasma BDNF in
depressed people who respond to treatment but not in treatment
non-responders or patients receiving an active placebo. These BDNF increases in depressed people given ketamine
are robustly correlated with the drug’s antidepressant effects.

It has been found there is a dispersion in normal brain connectivity and the disruption of the usual pattern of communication  in depression and addictions. . The integrity of functional networks decreased, being the
change maximal in functional hubs such as the thalamus, putamen
and high-level association cortices. In particular, connectivity
within the Default Mode Network was reduced between the posterior
cingulate cortex and the mPFC .
The connectivity between the parahippocampal and the retrosplenial
cortex also decreased as well as the segregation between
other major functional networks such as the salience, attention and
different visual networks Infusions of ketamine have shown to decrease connectivity
between and within resting-state consciousness networks.
Connectivity between the mPFC and the rest of the Default
Mode Network (via the posterior cingulate cortex) has been found
to be reduced, along with the integrity and activity of the salience
and visual networks are also affected. Since it is known
that connectivity with the mPFC is elevated in depression , the reduction of connectivity in the Default Mode
Network observed during the psychedelic experience might be a
mechanism that helps treat depressive states, which are very
common in addicts and predictive of relapse.

Given addiction is highly co-morbid with depression   and ketamine’s role within psychiatry changed
dramatically when it was discovered to be an anti-depressant, we
now briefly describe the research concerning ketamine and
depression. In 2000, the first clinical trial hinted at the potential of
ketamine as a treatment for depression. Four subjects diagnosed
with depression were intravenously administered 0.5 mg/kg of
ketamine in a randomised, double-blind design. The results were
compared to the injection of saline solutions in 3 subjects with an
equivalent diagnosis. Comparison on the Hamilton Rating Scale for
Depression (HAM-D) showed moderate evidence for a greater
reduction in scores after ketamine infusion compared to saline
(Berman et al., 2000). The reduction was rapid and outlasted the
subjective effects of ketamine, lasting for 3 days after infusion.
Despite the small sample size and the limited follow-up, this result
and anti-depressant effects observed in animal models of depression
encouraged researchers in the field to perform more studies in humans . Since then, over 30 studies have
examined the antidepressants effects of ketamine in patients with
treatment-resistant major depressive and bipolar disorders.

Ketamine has shown a 65-70% response rate in treating
depression within 24 h, which contrasts with the ~47% response
rate of conventional monoaminergic antidepressants after weeks
or months . Furthermore,
ketamine’s antidepressant actions are almost immediate and last
for approximately a week ,
whereas conventional antidepressive medications take weeks to
have an effect, are given daily and most of them fail to exert long lasting
effects . Furthermore, studies
have consistently shown that after a ketamine infusion there is a
significant reduction in suicidal ideation which also lasts for several
days.Depression and addiction’s co-expression is almost ubiquitous
People with alcohol, opioids, cannabis and
cocaine use disorders show notably higher rates of depression than
the average of the general population. Furthermore, high levels of depression and anxiety
may predispose relapse to: heroin, alcohol, cannabis and cocaine.

Memories and their creation and alteration is felt to be at the heart of cues and triggers and relapse in addiction. Once consolidated, memories are thought to be stored in a
stabilised state after initial acquisition. Shortly after reactivation
(i.e. remembered) of consolidated memories, these are rendered
transiently unstable and labile, before they then re-stabilise. This
process has been named reconsolidation . After reconsolidation,
the memories are stored again, but they may have been slightly
altered or updated. Each time memories are reactivated the latest
version is retrieved and they are again susceptible to change. During reconsolidation memories may be vulnerable to
manipulation and disruption. This was first demonstrated in animals
using fear conditioning. Rodents were trained to associate a
neutral stimulus with a shock such that the neutral stimulus elicited
a fear response. Researchers eliminated this fear response by
pharmacologically disrupting the reconsolidation process . Reward memories can also be disrupted such that a
neutral stimulus that once elicited appetitive behaviour no longer
does so. Therefore, non-pharmacological and drug therapies that
aim at weakening drug-cue memories via manipulation of reconsolidation
are of interest. Preclinical studies have shown that ketamine affects reconsolidation
of drug memories. . A recent review has suggested that ketamine (along with other psychedelics)
may be able to disrupt maladaptive appetitive memories
(Fattore et al., 2017).  Psychedelics and reconsolidation of traumatic and appetitive maladaptive memories: focus on cannabinoids and ketamine

Article ABSTRACT:

Rationale

Clinical data with 3,4-methylenedioxymethamphetamine (MDMA) in post-traumatic stress disorder (PTSD) patients recently stimulated interest on the potential therapeutic use of psychedelics in disorders characterized by maladaptive memories, including substance use disorders (SUD). The rationale for the use of MDMA in PTSD and SUD is being extended to a broader beneficial “psychedelic effect,” which is supporting further clinical investigations, in spite of the lack of mechanistic hypothesis. Considering that the retrieval of emotional memories reactivates specific brain mechanisms vulnerable to inhibition, interference, or strengthening (i.e., the reconsolidation process), it was proposed that the ability to retrieve and change these maladaptive memories might be a novel intervention for PTSD and SUD. The mechanisms underlying MDMA effects indicate memory reconsolidation modulation as a hypothetical process underlying its efficacy.

Objective

Mechanistic and clinical studies with other two classes of psychedelic substances, namely cannabinoids and ketamine, are providing data in support of a potential use in PTSD and SUD based on the modulation of traumatic and appetitive memory reconsolidation, respectively. Here, we review preclinical and clinical data on cannabinoids and ketamine effects on biobehavioral processes related to the reconsolidation of maladaptive memories.

Results

We report the findings supporting (or not) the working hypothesis linking the potential therapeutic effect of these substances to the underlying reconsolidation process. We also proposed possible approaches for testing the use of these two classes of drugs within the current paradigm of reconsolidation memory inhibition.

Furthermore, a meta-analysis of pre-clinical
studies found evidence suggesting that NMDAR antagonists can
be used to target reward memory reconsolidation, and more successfully
than adrenergic antagonists such as propranolol (Das
et al., 2013)  Das, R.K., Freeman, T.P., Kamboj, S.K., 2013. The effects of N-methyl d-aspartate and B-adrenergic receptor antagonists on the reconsolidation of reward memory: a meta-analysis. Neurosci. Biobehav. Rev. 37, 240-255.:

Abstract

Pharmacological memory reconsolidation blockade provides a potential mechanism for ameliorating the maladaptive reward memories underlying relapse in addiction. Two of the most promising classes of drug that interfere with reconsolidation and have translational potential for human use are N-methyl-d-aspartate receptor (NMDAR) and B-Adrenergic receptor (B-AR) antagonists. We used meta-analysis and meta-regression to assess the effects of these drugs on the reconsolidation of reward memory in preclinical models of addiction. Pharmacokinetic, mnemonic and methodological factors were assessed for their moderating impact on effect sizes. An analysis of 52 independent effect sizes (NMDAR = 30, B-AR = 22) found robust effects of both classes of drug on memory reconsolidation, but a far greater overall effect of NMDAR antagonism than B-AR antagonism. Significant moderating effects of drug dose, relapse process and primary reinforcer were found. The findings suggest that reward memory reconsolidation can be robustly targeted by NMDAR antagonists and to a lesser extent, by B-AR antagonists. Implications for future clinical work are discussed.

Highlights

► Meta-analysis of NMDAR and B-adrenergic antagonists in preclinical reward reconsolidation. ► Larger effects of NMDAR (r = .613) than B-adrenergic (r = .24) antagonists were found. ► ‘Relapse process’, trace type, reinforcer and drug dose moderated effect sizes. ► NMDAR antagonists particularly might be of clinical use in treating addiction.

 

.

                           Mystical experiences and psychedelic effects

Mystical experiences and psychedelic effects provoked by
classic psychedelic drugs have been shown to be psychologically
beneficial in long-term studies.They have not only been linked with positive
outcomes in various treatments, but also to ‘life-changing’,
‘spiritually meaningful’ and ‘eye opening’ events.In the ketamine studies described
above, anecdotal and qualitative reports suggest that the subjective
psychedelic experience seemed to help patients. For example, to
help them: undergo a cathartic process, improve relationships with
the world and other people, maintain positive psychological
changes and enhance self-awareness and personal growth.During KPT, patients reported a feeling of ‘resolution’ and
‘catharsis’ of some psychological problems, mainly those related to
alcohol. Furthermore, the degree of mystical experience was also
linked to the insight and impact of KPT reported by patients
. Interestingly, the intensity of the negative experiences (experiences associated
with negative emotions, fear and horror) during the
ketamine session was associated with longer remission. This was
blindly and quantitatively assessed by analysing patient’s selfreports.
Moreover, spirituality, self-concept, emotional attitudes
to other people and positive changes in life values and purposes
were improved after the ketamine experience.

Notably, ketamine’s mystical experiences, but not dissociative
effects, were found to mediate ketamine’s increase motivation to
quit 24 h after the infusion in cocaine addicts .
Moreover, consistent with previous studies, it was also observed
that mystical experiences were positively dose-dependent. This
study therefore provides evidence that the mystical experience
induced by ketamine is important in its therapeutic mechanism
. Speculatively, mystical experiences may help
to rapidly shift patients’ mindsets towards the integration and
acceptance of a sober lifestyle.

The acute disruptions of the functional networks, especially the
alterations to the default mode network, are related to the psychedelic
experience. In fact, the degree of network dissolution in
LSD and psilocybin is correlated with the intensity of the psychedelic
experience . The disruption to the default mode network may engender a reduction
in rumination and maladaptive repetitive thoughts. Psychological
therapies for addiction often aim to help the patient consider
different ways of life, especially those without the drug, and a
pharmacological agent such as ketamine which expedites that
process may be useful in treating addiction.

Speculatively, ketamine can
provide a unique mental state during and after acute drug effects
that facilitates and enriches therapeutic experiences, which in turn
may improve efficacy and lengthen treatment effects. Furthermore, synaptogenesis
and neurogenesis are putatively critical in learning new
information . The uptake of psychological therapy may
therefore be facilitated after ketamine infusions due increases in
synaptogenesis and neurogenesis, and thus improved learning of
relapse-reducing strategies, such as those used in relapseprevention
based cognitive behavioural therapy (CBT). In fact, the
idea that neurogenesis and synaptogenesis work synergistically
with psychological therapies is becoming recognised as a new
approach in the treatment of mental disorders . Theoretically, the administration of ketamine (which can
produce a ‘psychedelic’ experience) may open people’s minds so
they are more able to embrace what is presented during therapy as
well as enhancing the uptake of new therapeutic content.

The promise of ketamine in the treatment of addiction is supported
by research with large treatment effect sizes, especially in
comparison to existing treatments. In recently detoxified alcoholics,
ketamine treatment increased one-year abstinence rates in
alcoholics from 24% in the control to 66% in the ketamine group
(Krupitsky and Grinenko, 1997) and reduced cocaine self administration
by 67% relative to baseline in non-treatment
seeking cocaine users (Dakwar et al., 2016). These results clearly
demonstrate profound effects of ketamine administration (with
and without therapy) on drug and alcohol use, of an order of
magnitude which is 2 or 3 times more effective than existing
pharmacotherapies.

Ketamine for the treatment of addiction Evidence and potential mechanisms

 

Area Codes Near NOVA Health Recovery (703-844-0184)::
Maryland (MD): Bethesda 20814 – Bethesda 20816 – Bethesda 20817 – Chevy Chase 20815 – Colesville 20904 – Cabin John 20815 – Glen Echo 20812 – Gaithersburg 20855 – Gaithersburg 20877- Gaithersburg 20878 – Gaithersburg 20879 – Garrett Park 20896 – Kensington 20895 – Montgomery Village 20886 – Olney 20830 – Olney 20832 – Potomac 20854 – Potomac 20859 – Rockville 20850 – Rockville 20852 – Rockville 20853 – Silver Spring 20903 – Silver Spring 20905 – Silver Spring 20906 – Silver Spring 20910 – Takoma Park 20912 – Wheaton 20902 Washington DC: Crestwood 20011- North Capitol Hill 20002 – Cathedral Heights 20016 – American University Park 20016 – Columbia Heights 20010 – Mount Pleasant 20010 – Downtown 20036 – Dupont Circle 20009 – Logan Circle 20005- Adams Morgan 20009 – Chevy Chase 20015 – Georgetown 20007 – Cleveland Park 20008 – Foggy Bottom 20037 – Rock Creek Park – Woodley Park 20008 – Tenleytown 20016 Northern Virginia: McLean 22101- McLean 22102 – McLean 22106 – Great Falls 22066 – Arlington 22201 – Arlington 22202 – Arlington 22203 – Arlington 22205 – Falls Church 22041 – Vienna 22181 – Alexandria 22314 – 22308 -22306 -22305 -22304 Fairfax – 20191 – Reston – 22009 – Springfield – 22152 22015 Lorton 22199 Fairfax, Va 2303 – 22307 – 22306 – 22309 – 22308 22311 – 22310 – 22312 22315 -22003 – 20120 – 22015 – 22027 20121 – 22031 – 20124 22030 – 22033 – 22032 – 22035 – 22039 22041 – 22043 22042 – 22046 – 22044 – 22060 – 22066 20151 – 22079 – 20153 – 22101 22102 – 20171 – 20170 – 22124 – 22151 22150 – 22153 22152 – 20191 – 20190 – 22181- 20192 22180 – 20194 – 22182 Woodbridge – 22191 – 22192 -22193 -22194 – 22195 Springfield – 22150 – 22151 -22152-22153-22154-22155 -22156 – 22157 -22158 -22159 -22160

 

 

 

 

 

 

 

 

 

 

 

Ketamine IV reduces depression in Adolescents |703-844-0184 | Ketamine therapy for Anxiety and Depression| IV Ketamine for depression, PTSD, bipolar disorder, and others | Ketamine therapy for depression | 703-844-0184 | Fairfax, Va 22304 |

NOVA Health Recovery  <<< Ketamine Treatment Center Fairfax, Virginia

CAll 703-844-0184 for an immediate appointment to evaluate you for a Ketamine infusion:

Ketaminealexandria.com    703-844-0184 Call for an infusion to treat your depression. PTSD, Anxiety, CRPS, or other pain disorder today.

email@novahealthrecovery.com  << Email for questions to the doctor

Ketamine center in Fairfax, Virginia    << Ketamine infusions

Ketamine – NOVA Ketamine facebook page – ketamine treatment for depression

facebook Ketamine page

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Ketamine Consultants Blog
Ketamine doctors in Fairfax, Va | 703-844-0184

Below is a recent study regarding the treatment of adolescents with Ketamine for refractory depression. There seems to be good success and longer lasting results:

Intravenous Ketamine for Adolescents with Treatment-Resistant Depression: An Open-Label Study

The average response rate in published studies testing ketamine for adult TRD is 67% (Wan et al. 2015), which is considerably higher than TRD interventions (e.g., the average response rate for transcranial magnetic stimulation is 45%
(Conelea et al. 2017).

Background: Novel interventions for treatment-resistant depression (TRD) in adolescents are urgently needed. Ketamine has been studied in adults with TRD, but little information is available for adolescents. This study investigated efficacy and tolerability of intravenous ketamine in adolescents with TRD, and explored clinical response predictors.

Methods: Adolescents, 12–18 years of age, with TRD (failure to respond to two previous antidepressant trials) were administered six ketamine (0.5 mg/kg) infusions over 2 weeks. Clinical response was defined as a 50% decrease in Children’s Depression Rating Scale-Revised (CDRS-R); remission was CDRS-R score ≤28. Tolerability assessment included monitoring vital signs and dissociative symptoms using the Clinician-Administered Dissociative States Scale (CADSS).

Results: Thirteen participants (mean age 16.9 years, range 14.5–18.8 years, eight biologically male) completed the protocol. Average decrease in CDRS-R was 42.5% (p = 0.0004). Five (38%) adolescents met criteria for clinical response. Three responders showed sustained remission at 6-week follow-up; relapse occurred within 2 weeks for the other two responders. Ketamine infusions were generally well tolerated; dissociative symptoms and hemodynamic symptoms were transient. Higher dose was a significant predictor of treatment response.

Conclusions: These results demonstrate the potential role for ketamine in treating adolescents with TRD. Limitations include the open-label design and small sample; future research addressing these issues are needed to confirm these results. Additionally, evidence suggested a dose–response relationship; future studies are needed to optimize dose. Finally, questions remain regarding the long-term safety of ketamine as a depression treatment; more information is needed before broader clinical use.

Intravenous Ketamine for Adolescents – PDF

___________________________________________

Area Codes Near Us::
Maryland (MD): Bethesda 20814 – Bethesda 20816 – Bethesda 20817 – Chevy Chase 20815 – Colesville 20904 – Cabin John 20815 – Glen Echo 20812 – Gaithersburg 20855 – Gaithersburg 20877- Gaithersburg 20878 – Gaithersburg 20879 – Garrett Park 20896 – Kensington 20895 – Montgomery Village 20886 – Olney 20830 – Olney 20832 – Potomac 20854 – Potomac 20859 – Rockville 20850 – Rockville 20852 – Rockville 20853 – Silver Spring 20903 – Silver Spring 20905 – Silver Spring 20906 – Silver Spring 20910 – Takoma Park 20912 – Wheaton 20902 Washington DC: Crestwood 20011- North Capitol Hill 20002 – Cathedral Heights 20016 – American University Park 20016 – Columbia Heights 20010 – Mount Pleasant 20010 – Downtown 20036 – Dupont Circle 20009 – Logan Circle 20005- Adams Morgan 20009 – Chevy Chase 20015 – Georgetown 20007 – Cleveland Park 20008 – Foggy Bottom 20037 – Rock Creek Park – Woodley Park 20008 – Tenleytown 20016 Northern Virginia: McLean 22101- McLean 22102 – McLean 22106 – Great Falls 22066 – Arlington 22201 – Arlington 22202 – Arlington 22203 – Arlington 22205 – Falls Church 22041 – Vienna 22181 – Alexandria 22314 – 22308 -22306 -22305 -22304 Fairfax – 20191 – Reston – 22009 – Springfield – 22152 22015 Lorton 22199 Fairfax, Va 2303 – 22307 – 22306 – 22309 – 22308 22311 – 22310 – 22312 22315 -22003 – 20120 – 22015 – 22027 20121 – 22031 – 20124 22030 – 22033 – 22032 – 22035 – 22039 22041 – 22043 22042 – 22046 – 22044 – 22060 – 22066 20151 – 22079 – 20153 – 22101 22102 – 20171 – 20170 – 22124 – 22151 22150 – 22153 22152 – 20191 – 20190 – 22181- 20192 22180 – 20194 – 22182 Woodbridge – 22191 – 22192 -22193 -22194 – 22195 Springfield – 22150 – 22151 -22152-22153-22154-22155 -22156 – 22157 -22158 -22159 -22160 – 22161 Front Royal 22630

Ketamine IV reduces suicidal thinking in depressed patients |703-844-0184 | Ketamine therapy for Anxiety and Depression| IV Ketamine for depression, PTSD, bipolar disorder, and others | Ketamine therapy for depression | 703-844-0184 | Fairfax, Va 22304 |

NOVA Health Recovery  <<< Ketamine Treatment Center Fairfax, Virginia

CAll 703-844-0184 for an immediate appointment to evaluate you for a Ketamine infusion:

Ketaminealexandria.com    703-844-0184 Call for an infusion to treat your depression. PTSD, Anxiety, CRPS, or other pain disorder today.

email@novahealthrecovery.com  << Email for questions to the doctor

Ketamine center in Fairfax, Virginia    << Ketamine infusions

Ketamine – NOVA Ketamine facebook page – ketamine treatment for depression

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Ketamine has much support in the use of hard-to-treat depression and suicidal behaviors. Below are studies and their links, including a meta-analysis, which demonstrate the effect of Ketamine. Also a recent trial by Carlos Zarate shows the heterogenous nature of response to Ketamine . It is difficult to say who is going to be lifted from their depression completely or partially respond, but in the study, Dr. Zarate showed that patients with a long history of suicidal thinking and self-harm will have less of a response in some cases.

NOVA Health Recovery | 703-844-0184 | Fairfax, Virginia 22304
NOVA Health Recovery | 703-844-0184 | Fairfax, Virginia 22304

Intravenous ketamine may rapidly reduce suicidal thinking in depressed patients << Article link 

Intravenous ketamine may rapidly reduce suicidal thinking in depressed patients

Repeat intravenous treatment with low doses of the anesthetic drug ketamine quickly reduced suicidal thoughts in a small group of patients with treatment-resistant depression. In their report receiving Online First publication in the Journal of Clinical Psychiatry, a team of Massachusetts General Hospital (MGH) investigators report the results of their study in depressed outpatients who had been experiencing suicidal thought for three months or longer.

“Our finding that low doses of ketamine, when added on to current antidepressant medications, quickly decreased suicidal thinking in depressed patients is critically important because we don’t have many safe, effective, and easily available treatments for these patients,” says Dawn Ionescu, MD, of the Depression Clinical and Research Program in the MGH Department of Psychiatry, lead and corresponding author of the paper. “While several previous studies have shown that ketamine quickly decreases symptoms of depression in patients with treatment-resistant depression, many of them excluded patients with current suicidal thinking.”

It is well known that having suicidal thoughts increases the risk that patients will attempt suicide, and the risk for suicide attempts is 20 times higher in patients with depression than the general population. The medications currently used to treat patients with suicidal thinking — including lithium and clozapine — can have serious side effects, requiring careful monitoring of blood levels; and while electroconvulsive therapy also can reduce suicidal thinking, its availability is limited and it can have significant side effects, including memory loss.

Primarily used as a general anesthetic, ketamine has been shown in several studies to provide rapid relief of symptoms of depression. In addition to excluding patients who reported current suicidal thinking, many of those studies involved only a single ketamine dose. The current study was designed not only to examine the antidepressant and antisuicidal effects of repeat, low-dose ketamine infusions in depressed outpatients with suicidal thinking that persisted in spite of antidepressant treatment, but also to examine the safety of increased ketamine dosage.

The study enrolled 14 patients with moderate to severe treatment-resistant depression who had suicidal thoughts for three months or longer. After meeting with the research team three times to insure that they met study criteria and were receiving stable antidepressant treatment, participants received two weekly ketamine infusions over a three-week period. The initial dosage administered was 0.5 mg/kg over a 45 minute period — about five times less than a typical anesthetic dose — and after the first three doses, it was increased to 0.75 mg/kg. During the three-month follow-up phase after the ketamine infusions, participants were assessed every other week.

The same assessment tools were used at each visit before, during and after the active treatment phase. At the treatment visits they were administered about 4 hours after the infusions were completed. The assessments included validated measures of suicidal thinking, in which patients were directly asked to rank whether they had specific suicide-related thoughts, their frequency and intensity.

While only 12 of the 14 enrolled participants completed all treatment visits — one dropped out because of ketamine side effects and one had a scheduling conflict — most of them experienced a decrease in suicidal thinking, and seven achieved complete remission of suicidal thoughts at the end of the treatment period. Of those seven participants, two maintained remission from both suicidal thinking and depression symptoms throughout the follow-up period. While there were no serious adverse events at either dose and no major differences in side effects between the two dosage levels, additional studies in larger groups of patients are required before any conclusions can be drawn.

“In order to qualify for this study, patients had to have suicidal thinking for at least three months, along with persistent depression, so the fact that they experienced any reduction in suicidal thinking, let alone remission, is very exciting,” says Ionescu, who is an instructor in Psychiatry at Harvard Medical School. “We only studied intravenous ketamine, but this result opens the possibility for studying oral and intranasal doses, which may ease administration for patients in suicidal crises.”

She adds, “One main limitation of our study was that all participants knew they were receiving ketamine. We are now finishing up a placebo-controlled study that we hope to have results for soon. Looking towards the future, studies that aim to understand the mechanism by which ketamine and its metabolites work for people with suicidal thinking and depression may help us discover areas of the brain to target with new, even better therapeutic drugs.”

 

Rapid and Sustained Reductions in Current Suicidal Ideation Following Repeated Doses of Intravenous Ketamine: Secondary Analysis of an Open-Label Study  << Article in Clinical Psychiatry

Ketamine for Rapid Reduction of Suicidal Thoughts in Major Depression: A Midazolam-Controlled Randomized Clinical Trial Article link for below:

Ketamine was significantly more effective than a commonly used sedative in reducing suicidal thoughts in depressed patients, according to researchers at Columbia University Medical Center (CUMC). They also found that ketamine’s anti-suicidal effects occurred within hours after its administration.

The findings were published online last week in the American Journal of Psychiatry.

According to the Centers for Disease Control and Prevention, suicide rates in the U.S. increased by 26.5 percent between 1999 and 2015.

“There is a critical window in which depressed patients who are suicidal need rapid relief to prevent self-harm,” said Michael Grunebaum, MD, a research psychiatrist at CUMC, who led the study. “Currently available antidepressants can be effective in reducing suicidal thoughts in patients with depression, but they can take weeks to have an effect. Suicidal, depressed patients need treatments that are rapidly effective in reducing suicidal thoughts when they are at highest risk. Currently, there is no such treatment for rapid relief of suicidal thoughts in depressed patients.”

Most antidepressant trials have excluded patients with suicidal thoughts and behavior, limiting data on the effectiveness of antidepressants in this population. However, previous studies have shown that low doses of ketamine, an anesthetic drug, causes a rapid reduction in depression symptoms and may be accompanied by a decrease in suicidal thoughts.

The 80 depressed adults with clinically significant suicidal thoughts who enrolled in this study were randomly assigned to receive an infusion of low-dose ketamine or midazolam, a sedative. Within 24 hours, the ketamine group had a clinically significant reduction in suicidal thoughts that was greater than with the midazolam group. The improvement in suicidal thoughts and depression in the ketamine group appeared to persist for up to six weeks.

Those in the ketamine group also had greater improvement in overall mood, depression, and fatigue compared with the midazolam group. Ketamine’s effect on depression accounted for approximately one-third of its effect on suicidal thoughts, suggesting the treatment has a specific anti-suicidal effect.

Side effects, mainly dissociation (feeling spacey) and an increase in blood pressure during the infusion, were mild to moderate and typically resolved within minutes to hours after receiving ketamine.

“This study shows that ketamine offers promise as a rapidly acting treatment for reducing suicidal thoughts in patients with depression,” said Dr. Grunebaum. “Additional research to evaluate ketamine’s antidepressant and anti-suicidal effects may pave the way for the development of new antidepressant medications that are faster acting and have the potential to help individuals who do not respond to currently available treatments.”

Ketamine for Rapid Reduction of Suicidal Thoughts in major depression – A midazolam controlled trial PDF article

Ketamine for depression | PTSD | 703-844-0184 | NOVA Health Recovery | Fairfax, Virginia 22304
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Ketamine as a Potential Treatment for Suicidal Ideation A Systematic Review of the Literature 2015

Abstract
Objective To review the published literature on the efficacy
of ketamine for the treatment of suicidal ideation (SI).
Methods The PubMed and Cochrane databases were
searched up to January 2015 for clinical trials and case
reports describing therapeutic ketamine administration to
patients presenting with SI/suicidality. Searches were also
conducted for relevant background material regarding the
pharmacological function of ketamine.
Results Nine publications (six studies and three case
reports) met the search criteria for assessing SI after
administration of subanesthetic ketamine. There were no
studies examining the effect on suicide attempts or death
by suicide. Each study demonstrated a rapid and clinically
significant reduction in SI, with results similar to previously
described data on ketamine and treatment-resistant
depression. A total of 137 patients with SI have been
reported in the literature as receiving therapeutic ketamine.
Seven studies delivered a dose of 0.5 mg/kg intravenously
over 40 min, while one study administered a 0.2 mg/kg
intravenous bolus and another study administered a liquid
suspension. The earliest significant results were seen after
40 min, and the longest results were observed up to
10 days postinfusion.
Conclusion Consistent with clinical research on ketamine
as a rapid and effective treatment for depression, ketamine
has shown early preliminary evidence of a reduction in
depressive symptoms, as well as reducing SI, with minimal
short-term side effects. Additional studies are needed to
further investigate its mechanism of action, long-term
outcomes, and long-term adverse effects (including abuse)
and benefits. In addition, ketamine could potentially be
used as a prototype for further development of rapid-acting
antisuicidal medication with a practical route of administration
and the most favorable risk/benefit ratio.
Key Points
Preliminary data from randomized controlled trials
have demonstrated that ketamine may rapidly and
effectively control treatment-resistant depression,
though the effects are transient.
A small subset of studies has demonstrated similar
results in the effects of ketamine on suicidal ideation.
Ketamine has potential as a rapid treatment for
suicidal ideation and/or a possible model compound
for future drug development.

4 Discussion
With an estimated prevalence of mood disorders ranging
from 3.3 to 21.4 % and the substantially increased risk of
suicide among patients with mood disorders, treatment is
certainly warranted [19]. Current treatment options for
suicidality are limited. They include brain stimulation
therapeutics, such as ECT, and pharmacological intervention
(lithium, clozapine). The efficacy of lithium in treating
suicidality has been documented [20, 21] and has recently been reviewed and pooled in a recent meta-analysis of 48
studies [22]. Clozapine has also been shown to reduce
suicide risk in patients with schizophrenia [23, 24]. The
limitations of both lithium and clozapine include a longer
time to efficacy in this psychiatric emergency/urgency,
compared with the early response to ketamine [25]. Ketamine
seems to be gaining substantial evidence as a pharmacological
option for depression with a fast onset of
action, but its long-term effects need further investigation.
In addition, ketamine probably offers a faster onset of
action in terms of SI, but further work is certainly needed
in this area. Given the risk of suicide and even the
increasing rates of suicide in certain subgroups, such as
soldiers and veterans [26, 27], there is an urgent need for
faster therapeutics for SI and TRD. Importantly, suicidality
and suicide pose a high global burden of patient suffering
to families and society. Although several small-to-moderate
sized studies, in addition to several reviews, have been
published that have examined the efficacy of ketamine in
TRD, there are considerably fewer published data
specifically examining ketamine in patients presenting with
SI. Notably, only three studies have directly examined SI
as the primary outcome [11, 16, 17], while the rest
examined SI as the secondary outcome [4, 15, 18], not
including case reports. This review summarizes the current
published literature regarding ketamine as a treatment for
SI. The data so far show promising trends of ketamine
being an effective and rapid treatment with minimal side
effects.
Pharmacologically, ketamine is an N-methyl-D-aspartate
(NMDA) receptor antagonist. It has been used for anesthesia
in the USA since the 1970s. At subanesthetic doses,
ketamine has been shown to increase glutamate levels [3].
This mechanism is relevant, as glutamate regulation and
expression are altered in patients with major depressive
disorder (MDD). Studies have also demonstrated an
abnormal glutamate–glutamine–gamma-aminobutyric acid
cycle in patients with suicidality [28]. Furthermore, ketamine
has also been shown to work on nicotinic and opioid
receptors [29]. No other class of antidepressant medication
works to modulate the glutamatergic system, and research
continues into this, with the goal of characterizing the full
mechanism of action of ketamine and perhaps developing
other compounds that would have similar effects. Thus,
even if the approval and marketing of ketamine as a rapidacting
antisuicidal and antidepressant medication is not
realized, it could well be a prototype for development of
other medication(s) that retain the mechanism of action
with more favorable qualities and a lesser adverse effect
profile (such as a longer duration of action or less or no
addictive potential). Although the mechanisms explaining
the antisuicidal effect and the NMDA receptor antagonism
of ketamine are still unclear, some of the initial evidence
points to an anti-inflammatory action via the kynurenic
acid pathway. Strong suggestions as to the causal relationship
between inflammation and depression/suicidality
has come from studies demonstrating that cytokines [30,
31] and interferon-b [32] induce depression and suicidality.
Other recent studies have added to the notion of implicating
brain immune activation in the pathogenesis of suicidality.
For instance, one study showed microglial
activation of postmortem brain tissue in suicide victims
[33]. Another study found increased levels of the cytokine
interleukin-6 in cerebrospinal fluid from patients who had
attempted suicide [34]. Higher levels of inflammatory
markers have been shown in suicidal patients than in nonsuicidal
depressed patients [33, 35]. Inflammation leads to
production of both quinolinic acid (an NMDA agonist) and
kynurenic acid (a NMDA antagonist). An increased
quinolinic acid to kynurenic acid ratio leads to NMDA
receptor stimulation. The correlation between quinolinic
acid and Suicide Intent Scale scores indicates that changes
in glutamatergic neurotransmission could be specifically
linked to suicidality [36].
Small randomized controlled trials have demonstrated
the efficacy of ketamine in rapidly treating patients with
both TRD and/or bipolar depression [4, 8, 9, 11, 16–18].
Some studies have also examined suicide items as a secondary
measure in their depression rating scales [4, 7]. In
total, the studies examining ketamine and TRD have nearly
consistently demonstrated that ketamine provides relief
from depressive and suicidal symptoms, starting at 40 min
and lasting for as long as 5 days. Questions still remain as
to the long-term effects of this treatment, how much should
be administered and how often, any serious adverse effects,
and the mechanism of action.
Pharmacologically, ketamine has poor bioavailability
and is best administered via injection [37]. In their landmark
study, Berman et al. [4] found that a subanesthetic
dose (0.5 mg/kg) rapidly improved depressive symptoms.
Most of the subsequent studies have delivered ketamine as
a constant infusion for 40 min at a rate of 0.5 mg/kg.
Others have examined its efficacy after multiple infusions
and observed similar results [8, 13, 16, 38]. Currently, it is
recommended that ketamine be administered in a hospital
setting [39].

______________________________________

Characterizing the course of suicidal ideation response to ketamine

Characterizing the course of suicidal ideation response to ketamine PDF

2018 article from Carlos Zarate discussing the variable course outcomes with Ketamine for suicidality and correlations to serum markers and behavior and longevity of self-harm prior to treatment:

 

Background: : No pharmacological treatments exist for active suicidal ideation (SI), but the glutamatergic
modulator ketamine elicits rapid changes in SI. We developed data-driven subgroups of SI trajectories after
ketamine administration, then evaluated clinical, demographic, and neurobiological factors that might predict SI
response to ketamine.
Methods: : Data were pooled from five clinical ketamine trials. Treatment-resistant inpatients (n = 128) with
DSM-IV-TR-diagnosed major depressive disorder (MDD) or bipolar depression received one subanesthetic
(0.5 mg/kg) ketamine infusion over 40 min. Composite SI variable scores were analyzed using growth mixture
modeling to generate SI response classes, and class membership predictors were evaluated using multinomial
logistic regressions. Putative predictors included demographic variables and various peripheral plasma markers.
Results: : The best-fitting growth mixture model comprised three classes: Non-Responders (29%), Responders
(44%), and Remitters (27%). For Responders and Remitters, maximal improvements were achieved by Day 1.
Improvements in SI occurred independently of improvements in a composite Depressed Mood variable for
Responders, and partially independently for Remitters. Indicators of chronic SI and self-injury were associated
with belonging to the Non-Responder group. Higher levels of baseline plasma interleukin-5 (IL-5) were linked to
Remitters rather than Responders.
Limitations: : Subjects were not selected for active suicidal thoughts; findings only extend to Day 3; and plasma,
rather than CSF, markers were used.
Conclusion: : The results underscore the heterogeneity of SI response to ketamine and its potential independence
from changes in Depressed Mood. Individuals reporting symptoms suggesting a longstanding history of chronic
SI were less likely to respond or remit post-ketamine.

1. Introduction
Suicide poses a serious threat to public health. Worldwide, suicide
accounts for approximately 1 million deaths, and 10 million suicide
attempts are reported annually (World Health Organization, 2014). In
the United States, the national suicide rate has increased by approximately
28% over the last 15 years (Curtin et al., 2016). At the same
time, relatively few interventions for suicide risk exist. While treatments
such as clozapine and lithium have demonstrated effects on
suicidal behavior over weeks to months, these effects may be limited to
specific diagnoses (Cipriani et al., 2005; Griffiths et al., 2014). Currently,
no FDA-approved medications exist to treat suicidal ideation
(SI), leaving those who experience a suicidal crisis with limited options
for a reprieve of symptoms. Consequently, a critical need exists for
rapid-acting treatments that can be used in emergency settings.
A promising off-label agent for this purpose is the rapid-acting antidepressant
ketamine, which past studies have suggested reduces suicidal
thoughts (Diazgranados et al., 2010a; Murrough et al., 2015; Price
et al., 2009). A recent meta-analysis of 167 patients with a range of
mood disorder diagnoses found that ketamine reduced suicidal
thoughts compared to placebo as rapidly as within a few hours, with
effects lasting as long as seven days (Wilkinson et al., 2017). These
results are reinforced by newer findings of reduced active suicidal
ideation post-ketamine compared to a midazolam control(Grunebaum et al., 2018). As the efficacy literature develops in the era
of personalized medicine, two important issues must be addressed.
First, little is known about the acute course of SI following ketamine.
The speed with which antidepressant response occurs, and how much
improvement can be expected on average, has been documented for
single administrations of ketamine (Mathew et al., 2012; Sanacora
et al., 2017); in the limited available literature, researchers have
emulated previous studies examining antidepressant effect, where a
cutoff of 50% improvement demarcated response (Nierenberg and
DeCecco, 2001). Nevertheless, it remains unknown whether this categorization
accurately reflects the phenomenon of suicidal thoughts.
Empirically-derived approaches to the description of SI trajectory after
ketamine may be useful in operationalizing “response” in future clinical
trials.
Second, identifying demographic, clinical, or biological predictors
of SI response to ketamine would allow researchers and clinicians to
determine who is most likely to exhibit an SI response to ketamine. A
broad literature describes clinical and demographic predictors for suicide
risk (Franklin et al., 2017), and a smaller literature connects suicidal
thoughts and behaviors to plasma markers such as brain-derived
neurotrophic factor (BDNF) and cytokines (Bay-Richter et al., 2015;
Falcone et al., 2010; Isung et al., 2012; Serafini et al., 2017; Serafini
et al., 2013). However, no biomarkers have been shown to predict SI/
behavior response to intervention, a finding reinforced by the National
Action Alliance for Suicide Prevention’s Research Prioritization Task
Force’s Portfolio Analysis (National Action Alliance for Suicide
Prevention: Research Prioritization Task Force, 2015). Notably, predictor
analyses have the potential to reveal insights into personalized
treatments for suicidal individuals, as well as the neurobiology of SI
response. With respect to antidepressant response, for example, this
approach yielded the observation that individuals with a family history
of alcohol dependence may be more likely to exhibit an antidepressant
response to ketamine (Krystal et al., 2003; Niciu et al., 2014; PermodaOsip
et al., 2014).
The goals of this study were to elucidate trajectories of SI response
and identify predictors of that response, with the ultimate goal of
adding to the growing literature surrounding ketamine’s specific effects
on SI. In particular, we sought to determine whether the heterogeneous
patterns of change in SI after ketamine administration were better explained
by a model with two or more latent groups of trajectories rather
than a single average trajectory, using secondary analyses from previously
published clinical trials. These classes were then used to evaluate
potential clinical, demographic, and plasma biomarker predictors
of SI response to ketamine in order to generate hypotheses.. Discussion
This analysis used a data-driven approach to characterize SI response
to ketamine. The data were best explained by three trajectory
classes: one with severe average baseline SI and little to no response to
ketamine (Non-Responders), one with moderate average baseline levels
of SI and significant response to ketamine (Responders), and a third
with moderate average baseline levels of SI and complete remission of
SI by two days post-ketamine (Remitters). These findings suggest a
diversity of post-ketamine changes in SI that may not be captured under
traditional methods of categorizing response to treatment.
Furthermore, we found evidence that SI response and antidepressant
response could be distinguished from each other; one subset of participants
experienced improvement in SI that was partially explained by
improvements in Depressed Mood, while the other group’s improvements
in SI occurred independently of antidepressant response. With
regard to predictors of SI response trajectory, preliminary results suggest
the individuals least likely to experience improvement in SI postketamine
were those with the most severe SI and a history of self-injury.
Few plasma markers emerged as predictors of SI response in this study,
highlighting the limitations of connecting SI ratings of response with
biological markers.
The growth mixture modeling approach used here underscored the
heterogeneity of SI response to ketamine, which would not have been
captured by simply calculating the average trajectory. The class assignment
from this approach also differed from the definition of response
(50% reduction in symptoms) traditionally used in the antidepressant
literature, which often focuses on a specific timepoint rather
than the entire symptom trajectory. In comparing classification using a
50% response at Day 1 and Day 3 with the latent trajectory classes, we
found representation of almost every SI class across each responder
group, highlighting the potential limitations of the 50% response approach.
Further study is needed to determine which of these approaches
will prove more fruitful. Complete remission of SI has previously been
used as an outcome measure in clinical trials and in a meta-analysis of
ketamine’s efficacy (Grunebaum et al., 2017; Grunebaum et al., 2018;
Wilkinson et al., 2017), as well as in a study examining the relationship
between SI response to ketamine and changes in nocturnal wakefulness
(Vande Voort et al., 2017). One strength of the present study is that this
data-driven approach provides classifications that directly reflect the
phenomena under study as they are, as opposed to what they should be.
Especially when used in larger samples than the current study, this
approach is particularly promising in its ability to provide a more
nuanced understanding of the nature of SI response to ketamine.
Our results also support the idea that SI response in particular can target. First, it should be noted here that SI classes were not distinguishable
by baseline Depressed Mood scores; patients with the most
severe SI did not differ meaningfully in Depressed Mood scores from
those with the mildest SI. Second, while previous analyses of these data
documented that BMI and family history of alcohol dependence predicted
antidepressant response (Niciu et al., 2014), SI response was not
associated with these variables in the current analysis. Third, the antidepressant
response profiles of the SI classes suggest that SI response
and antidepressant response are not wholly redundant. This aligns with
previous clinical trials and meta-analytic reviews of the literature suggesting
that SI response to ketamine occurs partially independently of
antidepressant response (Grunebaum et al., 2018; Wilkinson et al.,
2017). Nevertheless, this independence did not hold true across both SI
response groups. Specifically, antidepressant and SI response were
clearly linked in Remitters, with depression accounting for half of the
changes in SI; however, in Responders, improvements in SI occurred
independently from improvements in Depressed Mood. These discrepancies
could be related to ketamine’s complex neurobiological
mechanisms or to the potentially low levels of clinical severity observed
in the Remitters.
Interestingly, the current analyses found no baseline demographic
variables that reliably distinguished Responders from Remitters. Some
phenotypic characteristics were uniquely associated with belonging to
the Non-Responder group, suggesting that a long-standing history of
self-injury or SI may indicate resistance to rapid changes in SI.
Relatedly, a recent, randomized clinical trial of repeat-dose ketamine
compared to placebo found that ketamine had no effect on SI in a
sample of patients selected for their longstanding, chronic history of SI
(Ionescu, 2017). These results highlight the importance of patient selection,
particularly for suicide risk. It should be stressed, however, that
SI does not necessarily translate to suicidal attempts or deaths; to our
knowledge, no study has yet linked ketamine with reduced risk of
suicidal behavior. Indeed, in the present study the SI Non-Responders
experienced limited antidepressant effects in response to ketamine, but
may nevertheless have improved on other, unmeasured symptoms that
could provide important benefit and relief. As the ketamine literature
develops, it will be important to identify which clinical symptom profiles
are most likely to have a robust anti-SI and anti-suicidal behavior
response to ketamine and which ones may benefit from other interventions.
While we evaluated a range of potential plasma markers previously
linked to suicidal ideation and behavior, in the present analysis only IL5
was associated with the SI Responder subgroup. Ketamine is known to
have anti-inflammatory effects (Zunszain et al., 2013), but the relationship
between antidepressant response and change in cytokine
levels remains unclear (Park et al., 2017). Cytokines have been linked
to suicidal behavior in the past; a recent meta-analysis found that lower
levels of IL-2 and IL-4, and higher levels of TGFbeta, were associated
with suicidal thoughts and behaviors (Serafini et al., 2013); however, toour knowledge IL-5 has not previously been linked to SI. Given the large
number of comparisons and lack of precedent in the literature, this
result may have been spurious and should be interpreted with caution.
A number of other results may reflect meaningful relationships, but the
high degree of variability—and the associated wide confidence intervals—suggests
that larger sample sizes are needed to better elucidate
the nature of any such relationships (e.g. baseline VEGF: χ2 = 6.13,
p = .05, but OR (95% CI) 13.33 (0.93–200.00)). Somewhat surprisingly,
plasma BDNF levels were not associated with responder class.
Previous studies of bipolar, but not MDD, samples found that plasma
BDNF levels were associated with SI response after ketamine
(Grunebaum, 2017; Grunebaum et al., 2017), suggesting that the mixed
diagnostic composition of this study may explain differences from
previous work. Studies exploring the relationship between BDNF and
antidepressant response to ketamine have also yielded mixed findings
(Haile et al., 2014; Machado-Vieira et al., 2009). Other data-driven
approaches have considered both biological and behavioral variables in
characterizing depression (Drysdale et al., 2017); a similar approach
might prove useful for predicting SI response.
The present study is associated with several strengths as well as
limitations. Strengths include the relatively large sample size of participants
who received ketamine, the use of composite SI scores from
previous exploratory factor analyses as opposed to individual items,
and the combination of clinical and biological markers as potential
predictors of class membership. Limitations include patient selection
methods, as these patients were part of an antidepressant trial and were
not selected for active suicidal thoughts, as well as the exploratory
nature of the analysis. As stated above, suicidal thoughts do not necessarily
equate to suicidal behavior, and class membership would thus
not necessarily correspond with an overall reduction in suicide risk.
Another limitation is that results were collapsed across several clinical
trials with slight variations in study design, and findings were thus only
extended to Day 3 rather than a week after ketamine administration. As
a result, only a subset of the sample could be used for predictive analyses.
In addition, plasma—rather than CSF—markers were used, and
the latter might better indicate underlying biology due to proximity to
the brain, though certain markers such as plasma BDNF may be related
to platelet storage, rather than the brain (Chacón-Fernández et al.,
2016). Comparison of results to trajectories of suicide-specific measures,
such as the Scale for Suicide Ideation (Beck et al., 1979), may also
give further insight into specific SI content. Finally, many clinical
predictors were collected upon hospital admission; future analyses
could use formal assessments, such as the Childhood Traumatic Questionnaire
(Bernstein et al., 1994), assessment of personality disorders,
or diagnoses such as post-traumatic stress disorder (PTSD) as potential
indicators of response.
Despite these limitations, the study demonstrates the utility of a
data-driven approach for characterizing the heterogeneity of SI response
to a rapid-acting intervention. This allows for a more finegrained
analysis of symptoms than would be permitted by traditionalapproaches, such as overall average response or dichotomization at
50% reduction in symptoms. This study identified several findings of
note. These included distinguishing at least three patterns of SI response
to ketamine and finding that subjects who exhibited more severe SI at
baseline were not likely to experience an SI response to ketamine.

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Ketamine offers a rapid solution for many when their other treatments for depression have failed. Most patients studied for Ketamine treatment have failed standard therapies. Sanjay Gupta discusses this below in the link:

 

KETAMINE as a rapid antidepressant – CNN article Sanjay Gupta

Suicide in the United States

 

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