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One more reason to treat your depression rapidly with Ketamine:

 

Depression Linked to Increased Risk of Developing Atrial Fibrillation

NEW YORK—Depression appears to be a risk factor for atrial fibrillation, the most common arrhythmia in the U.S., according to new observational data from the national Multi-Ethnic Study of Atherosclerosis (MESA) study.

Considering that 20% of U.S. adults report depressive symptoms, “our findings identify a large portion of the U.S. population that is potentially at an increased risk of developing atrial fibrillation and who may benefit from more targeted efforts to prevent atrial fibrillation,” Dr. Parveen Garg, from the Keck School of Medicine at the University of Southern California in Los Angeles, told Reuters Health by email.

He presented the study March 22 at the American Heart Association’s Epidemiology and Prevention/Lifestyle and Cardiometabolic Health Scientific Sessions in New Orleans.

The analysis included 6,644 adults (mean age, 62; 53% women, 38% white, 28% black, 22% Hispanic, 12% Chinese-American) with no known heart disease at baseline who were followed for a median of 13 years as part of the MESA study.

In the fully adjusted model, individuals with a Centers for Epidemiologic Studies Depression Scale (CES-D) score of 16 or higher (indicating clinically relevant depressive symptoms) had a 34% (P=0.039) higher risk of developing atrial fibrillation during follow-up compared with those with a CES-D score of less than 2. Similarly, individuals reporting antidepressant use had a significant 36% increase in their risk of developing atrial fibrillation compared with those not on the drugs.

“An important next step is to confirm these results in other studies, especially those with more comprehensive and clinically validated assessments of depression. If confirmed, then it will be important to determine if treating individuals with depression actually reduces their risk of atrial fibrillation,” Dr. Garg said.

Several mechanisms have been proposed to explain a possible link between depression and atrial fibrillation, Dr. Garg explained. Depression can increase systemic inflammation and activate the autonomic nervous system, which increases catecholamine levels, and the hypothalamic-pituitary-adrenal axis, which increases cortisol levels. Depression may also activate the renin-angiotensin-aldosterone system.

“Taken together, these changes may induce atrial fibrillation susceptibility either directly by disrupting the electrophysiologic properties of the atria or indirectly by promoting atrial fibrosis, increasing the atrial pressure,” Dr. Garg said, adding that further research is needed to fully understand the mechanisms involved.

Dr. Gordon Tomaselli, a spokesman for the American Heart Association, said this study “affirms the association between depression and atrial fibrillation in a population that I think is important because it’s a mixed population and not just the standard Caucasian population.”

“There are some associated risk factors in people with depression that might increase their risk of atrial fibrillation, including an increased incidence of hypertension in some patients who have depression as well as other disorders that might be driven by activation of the sympathetic nervous system like anxiety disorder. So there are several reasons why people might have depression and atrial fibrillation,” Dr. Tomaselli, who was not involved in the research, told Reuters Health by phone.

“One question is what should we do about it, and I’m not sure we have an answer from this study except to make sure that we are looking for symptoms of depression,” he said. “We don’t know whether treatment of depression will reduce the incidence of atrial fibrillation. There is some reason to think that it might, but there are other reasons to think that antidepressant drugs actually have some effects on the heart, the ion channels that determine the rhythm of the heart.”

The study had no commercial funding and the authors have no relevant disclosures.

SOURCE: https://bit.ly/2pCdkOA

AHA Epidemiology and Prevention – Lifestyle and Cardiometabolic Health Scientific Sessions 2018.

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Ketamine Nasal Sprays for Depression

What is ketamine?

Ketamine Nasal Spray
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Ketamine is a drug currently approved by the FDA for use as a general anesthetic during minor surgical procedures such as biopsies. It is widely known as a recreational drug because of its ability to induce cognitive-dissociative, hallucinogenic, and euphoric states in humans. Recently, it has been implicated in research as a potential therapeutic agent in depression especially in patients who have failed previous standard therapies.

Why ketamine?

Standard pharmacologic therapies for depression take several weeks of treatment before patients experience relief. Ketamine is different in that it has been shown to reduce depression symptoms and suicidal ideation in as little as forty minutes. This is considered a potentially lifesaving breakthrough in the treatment of depression because ketamine can rapidly reduce symptoms especially in emergency situations.

How does it work?

The most common medications used in depression affect serotonin in the brain. Ketamine works by a different mechanism. It has been shown to block the glutamate receptors in the brain resulting in its famous hallucinogenic effects. Ketamine has been shown to act on several other receptors, but it is theorized that at low doses, blocking glutamate receptors in the brain may be the reason for its anti-depressive effects.

Who should (and shouldn’t) take ketamine?

Ketamine has not been approved by the FDA for treatment of depression. Although, because of new studies, psychiatrists have been prescribing ketamine “off-label” for patients who did not respond to selective serotonin reuptake inhibitors (SSRIs) such has Celexa (citalopram), Zoloft (sertraline), or Prozac (fluoxetine) for immediate treatment of symptoms.

Ketamine has been shown to transiently yet significantly increase blood pressure following administration. Patients with high blood pressure should use caution when using ketamine. Ketamine has also been shown to be associated with increases in psychosis or dissociative properties.

Ketamine nasal sprays offer a quick and convenient way to administer ketamine for patients who need immediate relief, although they are currently not available commercially, so you will not find them at your local community pharmacy. Compounding pharmacies have the proper experience, equipment, and personnel to safely compound and customize this medication for you.

References

  1. Ketalar [package insert]. Chestnut Ridge, NY 10977: Par pharmaceutical; 2017 https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/016812s043lbl.pdf
  2. Browne CA, Lucki I. Antidepresssant effects of ketamine: mechanisms underlying fast-acting novel antidepressants. Front Pharmacol December 2013.
  3. Lapidus K, Levitch CF, Perez AM, et al. A randomized controlled trial of intranasal ketamine in major depressive disorder. Biol Psychology 2014;76:970–976
  4. 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(4):399-405.

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From street drug to depression therapy

Ketamine offers a new option for people with stubborn depression that doesn’t respond to other medications.

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Many people know of ketamine as a hallucinogenic and addictive street drug, which, when abused, can put people in medical peril. But today, doctors are increasingly looking to ketamine as a potentially lifesaving treatment for people with severe, treatment-resistant depression, who may be at high risk for suicide.

“Ketamine has been shown to be effective in people who have not responded to antidepressant treatment,” says Dr. Cristina Cusin, an assistant professor of psychiatry at Harvard Medical School. The fast-acting treatment has shown promise — sometimes improving depressive symptoms within hours of the first intravenous treatment.

While ketamine can offer hope to some, it’s not for everyone. The use of ketamine to treat depression is still controversial in some circles. “Some prescribers would never consider the use of a controlled substance for this purpose, because of the potential for abuse,” says Dr. Cusin. “But as with opiates, a drug is not good or bad, per se.” Still, ketamine does need to be carefully matched to the right patient for the right use to avoid harm, and treatment should be closely monitored over time.

A variety of uses

The use of ketamine in medicine isn’t new. It’s routinely used in hospitals both for anesthesia and for pain relief.

Currently, the use of ketamine for depression is “off label.” This means that although ketamine is approved by the FDA for some medical purposes, it’s not approved specifically to treat depression. However, that may soon change. Under its “fast track” drug approval process, the FDA is reviewing the results of clinical trials of esketamine, a ketamine-based nasal spray, to treat depression, says Dr. Cusin.

For now, people who undergo ketamine treatment for depression typically receive the drug at specialized clinics, either intravenously or as a nasal spray. Effects from the nasal spray last for a single day or a few days, while the intravenous treatment may last for a few weeks to a month. In both instances the dose is significantly lower than would be used for anesthesia or when used illicitly.

How ketamine works

Studies have shown that ketamine is effective in treating people whose depression has not responded to other interventions, says Dr. Cusin. Such treatment-resistant depression is estimated to affect from 10% to 30% of people diagnosed with the condition.

Experts believe that ketamine works through a unique mechanism, directly modulating the activity of a brain chemical called glutamate. Glutamate is believed to play a role in stimulating the growth of new brain connections that may help alleviate depressive symptoms.

People who have taken ketamine to treat their depression experience varying success, depending on their personal history—how long they’ve been depressed, how severe their symptoms are, and how many drugs they’ve tried without seeing improvement, says Dr. Cusin.

For people with less severe depression, ketamine may be effective in as many as 60% of those who try it. Among those with more persistent and significant disease, a smaller number, 30% to 40%, may experience relief, says Dr. Cusin. “The expectation should not be that it will magically cure depression in everybody,” she says. “Ketamine is not a perfect fix. It’s like any other medication.” In other words, it works for some people, and it won’t work for others.

To be effective, treatment with ketamine must typically continue indefinitely and involve careful monitoring. Clinicians who prescribe ketamine for depression should screen patients carefully to ensure the drug is appropriate for the individual, says Dr. Cusin. “Not everybody who wishes to try ketamine will be a good candidate,” she says.

Among those who should not use ketamine are people with

  • a history of substance abuse
  • a history of psychosis
  • elevated blood pressure
  • an uncontrolled medical condition.

Who can benefit?

Because ketamine is a newer treatment, there are still a lot of questions surrounding its use, says Dr. Cusin. For instance:

  • Which people respond best to treatment?
  • How much should be given, and how often?
  • What are the long-term effects of treatment?

Because the medication is being used off label for depression, there are no clearly defined safety recommendations either for home use or for its use in specialized clinics, she says. This means that it’s up to individual providers to guide the patient in making informed decisions about treatment. Choosing a qualified provider is essential. JAMA Psychiatrypublished a statement in 2017 outlining best practices for doctors to follow in ketamine treatment, such as performing a comprehensive assessment, obtaining informed consent, and documenting the severity of depression before starting the medication. These guidelines are aimed at increasing the safe use of ketamine for depression, and providers can use them to help ensure that the treatment is a good match for your condition.

As with any other medical intervention, anyone considering ketamine should also consider the drawbacks of treatment along with the potential benefits. Ketamine’s drawbacks include these:

Cost. It’s expensive and not covered by insurance. “The cost ranges from $400 to $1,200 per dose for the intravenous drug, and you may need as many as 12 to 18 doses a year,” says Dr. Cusin.

Unknowns. Ketamine hasn’t been used to treat depression for long enough for doctors to know whether there are any harmful long-term consequences of taking the medication. More time and study are needed to truly understand how it affects people over the long term.

Treatment failure. Many people with treatment-resistant depression view ketamine treatment as their last option, so if this therapy fails to improve their depression, they can be emotionally devastated. Realistic expectations and follow-up support are essential.

Even if ketamine does produce results, it’s still important to understand what it can and can’t do. “-Ketamine isn’t going to eliminate all frustrations and stress from your life. While it may lift some symptoms of depression, the life stressors will still be there,” says Dr. Cusin. You’ll still need support to help you manage them.

Side effects. While ketamine is viewed as safe in a controlled setting, it can frequently increase blood pressure or produce psychotic-like behavior, which may result in delusions or hallucinations. Serious adverse events are rare because the drug is used at such low doses, says Dr. Cusin.

However, provided you are an appropriate candidate for the treatment and your doctor monitors you closely, you could find that it improves your mood. “Ketamine could make a huge difference in the quality and duration of life and can be very effective for people who are thinking about suicide,” says Dr. Cusin.

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Seasonal Affective Disorder and Ketamine Infusions as a rapid treatment

 

Do you find yourself getting depressed and sad in the fall and wintertime despite your best efforts? Seasonal affective disorder is common and can disrupt your lifestyle and happiness. Consider Ketamine infusions as an option for immediate relief with follow through intranasal ketamine. We can provide these solutions for people suffering from this disorder. A series of 2- 6 infusions can manage the majority of patients with rapid recover, almost within a few days. 

Seasonal Affective Disorder, or SAD, is a type of recurrent major depressive disorder in which episodes of depression occur during the same season each year. This condition is sometimes called the “winter blues.”

Definition

Seasonal affective disorder (also called SAD) is form of depression in which people experience depressive episodes during specific times of the year. The most common seasonal pattern is for depressive episodes to being in the fall or winter and diminish in the spring. A less common type of SAD, known as summer depression, usually begins in the late spring or early summer. SAD may be related to changes in the amount of daylight a person receives.

SAD is not considered as a separate disorder, but rather is a type of depression that has a recurring seasonal pattern. To be diagnosed with SAD, an individual must meet criteria for major depression coinciding with specific seasons for at least two years. The individual must experience seasonal depressions much more frequently than any non-seasonal depressions.

Seasonal affective disorder is estimated to affect 10 million Americans. Another 10 percent to 20 percent may have mild SAD. SAD is four times more common in women than in men. The age of onset is estimated to be between the age of 18 and 30. Some people experience symptoms severe enough to affect quality of life, and 6 percent require hospitalization. Many people with SAD report at least one close relative with a psychiatric disorder, most frequently a severe depressive disorder (55 percent) or alcohol abuse (34 percent).

Symptoms

Not everyone with SAD has the same symptoms, but symptoms commonly associated with the “winter blues” include the following:

  • Feelings of hopelessness and sadness
  • Thoughts of suicide
  • Hypersomnia or a tendency to oversleep
  • A change in appetite, especially a craving for sweet or starchy foods
  • Weight gain
  • A heavy feeling in the arms or legs
  • A drop in energy level
  • Decreased physical activity
  • Fatigue
  • Difficulty concentrating
  • Irritability
  • Increased sensitivity to social rejection
  • Avoidance of social situations

Symptoms of summer SAD are:

  • Poor appetite
  • Weight loss
  • Insomnia
  • Agitation and anxiety

Either type of SAD may also include some of the symptoms that are present in major depression, such as feelings of guilt, a loss of interest or pleasure in activities previously enjoyed, ongoing feelings of hopelessness or helplessness, or physical problems such as headaches and stomach aches.

Symptoms of SAD tend to reoccur at about the same time every year. To be diagnosed with SAD, the changes in mood should not be a direct result of obvious seasonal stressors (like being regularly unemployed during the winter). Usually, this form of depression is mild or moderate. However, some people experience severe symptoms that leave them unable to function in their daily lives.

Seasonal affective disorder can be misdiagnosed as hypothyroidyism, hypoglycemia, or a viral infection such as mononucleosis.

Causes

The cause for SAD is unknown. One theory is that it is related to the amount of melatonin in the body, a hormone secreted by the pineal gland. Darkness increases the body’s production of melatonin, which regulates sleep. As the winter days get shorter and darker, melatonin production in the body increases and people tend to feel sleepier and more lethargic.

Another theory is that people with SAD may have trouble regulating their levels of serotonin, which is a major neurotransmitter involved in mood. Finally, research has suggested that people with SAD also may produce less Vitamin D, which is believed to play a role in serotonin activity. Vitamin D insufficiency may be associated with clinically significant depression symptoms.

There are several known risk factors that increase an individuals chance of developing SAD. For example, SAD is more frequent in people who live far north or south of the equator. Additionally, people with a family history of other types of depression are more likely to develop SAD than people who do not have this family history.

Treatments

Treatment approaches to alleviate the symptoms of SAD typically include combinations of antidepressant medication, light therapy, Vitamin D, and counseling.

Because winter depression may be caused by a reaction to a lack of sunlight, broad-band light therapy is frequently used as a treatment option. This therapy requires a light box or a light visor worn on the head like a cap. The individual either sits in front of the light box or wears light visor for a certain length of time each day. Generally, light therapy takes between 30 and 60 minutes each day throughout the fall and winter. The amount of time required varies with each individual. When light therapy is sufficient to reduce symptoms and to increase energy level, the individual continues to use it until enough daylight is available, typically in the springtime. Stopping light therapy too soon can result in a return of symptoms.

When used properly, light therapy seems to have few side effects. The side effects that do arise include eyestrain, headache, fatigue, irritability, and inability to sleep (when light therapy is used too late in the day). People with manic depressive disorders, skin that is sensitive to light, or medical conditions that make their eyes vulnerable to light damage may not be good candidates for light therapy.

When light therapy does not improve symptoms within a few days, then medication and behavioral therapies such as CBT should be introduced. In some cases, light therapy can be used in combination with one or all of these therapies.

Self-Care

  • Monitor your mood and energy level
  • Take advantage of available sunlight
  • Plan pleasurable activities for the winter season
  • Plan physical activities
  • Approach the winter season with a positive attitude
  • When symptoms develop seek help sooner rather than later
  • Light therapy and lamps for SAD
  • IV Vitamin Therapy for rapid recovery including Vitamin D injections

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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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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

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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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The IV Medical Center – IV Vitamin Drips for wellness and recovery

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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.

Ketamine Therapy | Ketamine Doctors | 703-844-0184 | Fairfax, Virginia | Depression causes RAPID AGING due to Oxidative stress | NOVA Health Recovery, Alexandria, Va 22306

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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 Consultants Blog
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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.

 

Ketamine Therapy | Ketamine Doctors | 703-844-0184 | Fairfax, Virginia | Ketamine and Psychedelic drugs – for depression and neuroplasticity | NOVA Health Recovery, Alexandria, Va 22306

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
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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.

Fairfax | NOVA Ketamine IV Ketamine for depression | Fairfax, Va 22306 | 703-844-0184
Fairfax | NOVA Ketamine IV Ketamine for depression | Fairfax, Va 22306 | 703-844-0184

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