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posted by mrpg on Wednesday January 30 2019, @04:16PM   Printer-friendly
from the the-chicken-crossed-the-road-to-do-LSD dept.

Study shows how LSD interferes with brain's signalling

A group of volunteers who took a trip in the name of science have helped researchers uncover how LSD messes with activity in the brain to induce an altered state of consciousness.

Brain scans of individuals high on the drug revealed that the chemical allows parts of the cortex to become flooded with signals that are normally filtered out to prevent information overload.

The drug allowed more information to flow from the thalamus, a kind of neural gatekeeper, to a region called the posterior cingulate cortex, and it stemmed the flow of information to another part known as the temporal cortex. [...] The scientists wanted to test a hypothesis first put forward more than a decade ago. It states LSD causes the thalamus to stop filtering information it relays to other parts of the brain. It is the breakdown of this filter that gives rise to the weird effects the drug induces, or so the thinking goes.

Effective connectivity changes in LSD-induced altered states of consciousness in humans (open, DOI: 10.1073/pnas.1815129116) (DX)

Related: Research into Psychedelics, Shut Down for Decades, is Now Yielding Exciting Results
Research Into Psychedelics Continues
Lucy in the Sky With Protein: Key to LSD's Psychoactive Potency Possibly Found
From 'problem Child' to 'prodigy'? LSD Turns 75


Original Submission

Related Stories

Research into Psychedelics, Shut Down for Decades, is Now Yielding Exciting Results 40 comments

Beginning in the nineteen-fifties, psychedelics had been used to treat a wide variety of conditions, including alcoholism and end-of-life anxiety. The American Psychiatric Association held meetings centered on LSD. Some of the best minds in psychiatry had seriously studied these compounds in therapeutic models, with government funding.

Between 1953 and 1973, the federal government spent four million dollars to fund a hundred and sixteen studies of LSD, involving more than seventeen hundred subjects. Through the mid-nineteen-sixties, psilocybin and LSD were legal and remarkably easy to obtain. Sandoz, the Swiss chemical company, gave away large quantities of Delysid—LSD—to any researcher who requested it, in the hope that someone would discover a marketable application.

Now, forty years after the Nixon Administration effectively shut down most psychedelic research, the government is gingerly allowing a small number of scientists to resume working with these powerful and still somewhat mysterious molecules.

Research Into Psychedelics Continues 7 comments

The clinical trials at N.Y.U.—a second one, using psilocybin to treat alcohol addiction, is now getting under way—are part of a renaissance of psychedelic research taking place at several universities in the United States, including Johns Hopkins, the Harbor-U.C.L.A. Medical Center, and the University of New Mexico, as well as at Imperial College, in London, and the University of Zurich. As the drug war subsides, scientists are eager to reconsider the therapeutic potential of these drugs, beginning with psilocybin. (Last month The Lancet, the United Kingdom's most prominent medical journal, published a guest editorial in support of such research.) The effects of psilocybin resemble those of LSD, but, as one researcher explained, "it carries none of the political and cultural baggage of those three letters." LSD is also stronger and longer-lasting in its effects, and is considered more likely to produce adverse reactions. Researchers are using or planning to use psilocybin not only to treat anxiety, addiction (to smoking and alcohol), and depression but also to study the neurobiology of mystical experience, which the drug, at high doses, can reliably occasion. Forty years after the Nixon Administration effectively shut down most psychedelic research, the government is gingerly allowing a small number of scientists to resume working with these powerful and still somewhat mysterious molecules.

As I chatted with Tony Bossis and Stephen Ross in the treatment room at N.Y.U., their excitement about the results was evident. According to Ross, cancer patients receiving just a single dose of psilocybin experienced immediate and dramatic reductions in anxiety and depression, improvements that were sustained for at least six months. The data are still being analyzed and have not yet been submitted to a journal for peer review, but the researchers expect to publish later this year.

The results taste orange.

takyon: Michael Pollan's article was published in 2015 (covered by us here) and is now featured in The Best American Nonrequired Reading 2016. Here is some fresher material:

Tripping up addiction: the use of psychedelic drugs in the treatment of problematic drug and alcohol use (DOI: 10.1016/j.cobeha.2016.10.009) (DX)

Psychedelics not linked to mental health problems or suicidal behavior: A population study (open, DOI: 10.1177/0269881114568039) (DX)

MDMA could be on the market legally by 2021:

In small studies around the country, a handful of researchers have been investigating how MDMA-assisted psychotherapy can help heal the psychological and emotional damage caused by sexual assault, war, violent crime, and other traumas. Now, federal regulators have approved the drug for use in large-scale clinical trials too—a move that could set the stage for making "ecstasy" legally available as a new medicine. The Phase III trials will involve at least 230 patients, and will be sponsored by the Multidisciplinary Association for Psychedelic Studies (MAPS), an organization that advocates for the medical use of various psychedelics, including MDMA (otherwise known as ecstasy or Molly or millennial aspirin). The organization funded early safety and efficacy trials of the drug in the past. And in one pilot study involving 19 PTSD patients, more than half experienced decreased symptoms for up to six years after receiving three doses of MDMA.


Original Submission

Lucy in the Sky With Protein: Key to LSD's Psychoactive Potency Possibly Found 12 comments

Scientists may have found why a LSD trip lasts so long:

By freezing an LSD molecule bound to a single brain cell receptor as a crystal in a lab, researchers were able to get a 3-D x-ray image of the drug and the protein locked together. "My lab has been trying to do this since the early 1990s," says Bryan Roth, a pharmacologist at the University of North Carolina at Chapel Hill and senior author on the paper. "I remember Dan Wacker [a co-author, also at U.N.C.] showing the image. It was basically a moment of silence. I started to fight back tears of gratitude that we had finally gotten it." It is the first 3-D image of a psychedelic bound to a brain receptor, Roth says.

The image showed Roth and his co-authors something strange about the way LSD fit inside this receptor. Drugs typically come and go from receptor proteins like ships pulling in and out of a port. But when an LSD molecule lands on the receptor, the molecule snags onto a portion of the protein and folds it over itself as the molecule binds to the receptor. "There was this lid that came over the molecule. It looked like it trapped LSD in the receptor," Roth says. "That immediately suggested to us why LSD lasts so long."

LSD seems to stimulate the receptor for the entire time it is trapped underneath the protein "lid," Roth says. Proteins are in constant motion, so he thinks the lid eventually flops open, allowing the drug to fly out and the effects to wear off. But the team ran computer models that suggest it could take hours for that to happen. Until then, the trip goes on.

Other articles on the topic:
Popular Science
LiveScience


Original Submission

From 'problem Child' to 'prodigy'? LSD Turns 75 46 comments

Submitted via IRC for chromas

From 'problem child' to 'prodigy'? LSD turns 75

Lysergic acid diethylamide was labelled a "problem child" by the man who discovered its hallucinogenic properties in 1943: as it turns 75, the drug known as LSD may now be changing its image.

The late Swiss chemist Albert Hofmann famously learned of LSD's psychedelic effects when he inadvertently took a small dose while doing lab work for pharmaceutical company Sandoz.

He wanted the drug to be medically researched, convinced it could be a valuable psychiatric tool and lead to a deeper understanding of human consciousness.

But through the 1960s, LSD became synonymous with counterculture and anti-authority protests.

By the early 1970s, it had been widely criminalised in the West, prompting Hofmann to publish his 1979 memoir, "LSD: My Problem Child".


Original Submission

Groundbreaking Ketamine-Derived Treatment for Depression Approved by the U.S. FDA 24 comments

Fast-Acting Depression Drug, Newly Approved, Could Help Millions

Of the 16 million American adults who live with depression, as many as one-quarter gain little or no benefit from available treatments, whether drugs or talk therapy. They represent perhaps the greatest unmet need in psychiatry. On Tuesday, the Food and Drug Administration approved a prescription treatment intended to help them, a fast-acting drug derived from an old and widely used anesthetic, ketamine.

The move heralds a shift from the Prozac era of antidepressant drugs. The newly approved treatment, called esketamine, is a nasal spray developed by Janssen Pharmaceuticals Inc., a branch of Johnson & Johnson, that will be marketed under the name Spravato. It contains an active portion of the ketamine molecule, whose antidepressant properties are not well understood yet. "Thank goodness we now have something with a different mechanism of action than previous antidepressants," said Dr. Erick Turner, a former F.D.A. reviewer and an associate professor of psychiatry at Oregon Health & Science University. "But I'm skeptical of the hype, because in this world it's like Lucy holding the football for Charlie Brown: Each time we get our hopes up, the football gets pulled away."

[...] Esketamine, like ketamine, has the potential for abuse, and both drugs can induce psychotic episodes in people who are at high risk for them. The safety monitoring will require doctors to find space for treated patients, which could present a logistical challenge, some psychiatrists said.

The wholesale cost for a course of treatment will be between $2,360 and $3,540, said Janssen, and experts said it will give the company a foothold in the $12 billion global antidepressant market, where most drugs now are generic.

[...] One question that will need to be answered is how well esketamine performs in comparison to intravenous ketamine.

Also at STAT News, Reuters, and NPR.

Previously: Ketamine Reduces Suicidal Thoughts in Depressed Patients
Studies Identify How Ketamine Can Reverse Symptoms of Depression
Ketamine Shows Promise as a Fast-Acting Treatment for Depression

Related:


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  • (Score: 3, Informative) by Thexalon on Wednesday January 30 2019, @06:09PM (8 children)

    by Thexalon (636) Subscriber Badge on Wednesday January 30 2019, @06:09PM (#794162)

    The reason LSD is illegal is because conservatives wanted to stick it to those anti-war hippie types in 1968, and they couldn't make it illegal to be an anti-war hippie but they could go after the mostly harmless stuff the hippies were doing. This was in the face of research that both psychologists and the CIA had done that suggested it had a lot of beneficial effects. It's still illegal for basically the same reason.

    I've never tried it, but I know people who very occasionally take hits and find the experience really wonderful. Then again, some of those people hung around with Dr. Timothy Leary back in the day, so their viewpoint is likely biased a bit.

    --
    The only thing that stops a bad guy with a compiler is a good guy with a compiler.
    • (Score: 3, Informative) by DeathMonkey on Wednesday January 30 2019, @06:26PM (7 children)

      by DeathMonkey (1380) on Wednesday January 30 2019, @06:26PM (#794166) Journal

      Conservatives don't believe the Constitution applies to anyone that looks different from them or thinks different from them.

      You can see a lot of evidence for this claim right here on this very website.

      • (Score: 3, Insightful) by Farkus888 on Wednesday January 30 2019, @07:11PM (5 children)

        by Farkus888 (5159) on Wednesday January 30 2019, @07:11PM (#794185)

        True, but the liberals don't think much of the conservatives favorite part of the constitution either. Both sides are at least as interested in hurting the other as getting the thing they claim to want.

        • (Score: 1, Insightful) by Anonymous Coward on Wednesday January 30 2019, @07:30PM

          by Anonymous Coward on Wednesday January 30 2019, @07:30PM (#794198)

          Republicrats is one party... I can't believe people still think otherwise. They are both on the side of distracting you about pointless crap like a 5 billion dollar wall or abortion while taking away your rights and scamming you. DO NOT VOTE FOR THEM.

        • (Score: 4, Insightful) by DeathMonkey on Wednesday January 30 2019, @07:53PM (2 children)

          by DeathMonkey (1380) on Wednesday January 30 2019, @07:53PM (#794216) Journal

          Any gun restrictions that the Supreme Court agrees don't violate the 2nd amendment would be applied equally to all citizens.

          So, no, your equivalency is false.

          • (Score: 3, Insightful) by Farkus888 on Thursday January 31 2019, @01:40AM

            by Farkus888 (5159) on Thursday January 31 2019, @01:40AM (#794329)

            First of all, I meant to use the plural parts. You singled out the second amendment not me. I'll bite anyway. Statistically speaking I agree that Republicans are more likely to like guns. A ban on tampons affects men and women equally by your logic though.

          • (Score: 2) by deimtee on Thursday January 31 2019, @07:00AM

            by deimtee (3272) on Thursday January 31 2019, @07:00AM (#794437) Journal

            Any gun restrictions that the Supreme Court agrees don't violate the 2nd amendment would be applied equally to all citizens.

            You can fix that statement by removing some words : "Any gun restrictions violate the 2nd amendment."
            I am not in the USA but any reading of the second amendment makes it quite plain that any law that restricts weapons at all is unconstitutional, regardless of what excuses the SC may make to allow them. They should strike down every arms control law until 'the people' amend the constitution, and update the 2nd to fit a modern society.

            --
            No problem is insoluble, but at Ksp = 2.943×10−25 Mercury Sulphide comes close.
        • (Score: 2) by Thexalon on Wednesday January 30 2019, @11:47PM

          by Thexalon (636) Subscriber Badge on Wednesday January 30 2019, @11:47PM (#794289)

          the conservatives favorite part of the constitution either.

          Which part is that? A sibling poster assumed it was the 2nd Amendment, but as far as I can tell their actual favorite part of the Constitution is Article 2, Section 2, which enumerates the powers of the presidency, including their favorite part naming him Commander-in-Chief of the armed forces. Because it's one thing to be manly with your own AR-15, it's another thing to be manly with a whole army with tanks and planes and such.

          Libertarians seem to like the 2nd Amendment, but if you look at what the last few Republican presidents have actually done you'll see nothing that suggests they care about it all that much. After all, why use your own guns when you can order 2 million other people to use theirs?

          --
          The only thing that stops a bad guy with a compiler is a good guy with a compiler.
      • (Score: 2) by takyon on Wednesday January 30 2019, @07:31PM

        by takyon (881) <reversethis-{gro ... s} {ta} {noykat}> on Wednesday January 30 2019, @07:31PM (#794201) Journal
  • (Score: 2, Funny) by Rupert Pupnick on Wednesday January 30 2019, @07:57PM

    by Rupert Pupnick (7277) on Wednesday January 30 2019, @07:57PM (#794219) Journal

    How do I sign up for the next study?

  • (Score: 4, Interesting) by Rich on Wednesday January 30 2019, @08:13PM (2 children)

    by Rich (945) on Wednesday January 30 2019, @08:13PM (#794225) Journal

    Just yesterday I happened to stumble across the simulated annealing algorithm for NP-hard optimizations. The idea is that at the beginning of the search (and then with decreasing likelihood) random steps into a seemingly wrong direction of the problem space are taken. This avoids getting stuck at local maxima. I guess there are similar schemes for training neural networks. It looks like the described mechanism causes a such an effect in the brain. Through the "overload", the brain reaches associative patterns it could otherwise not get to, because it is stuck in a "local maximum". As the effect decreases, the function gets back to normal, but by this time, the newly seen patterns can be applied to the normal function - but with an increased repertoire of "ideas" to apply to problems.

    Or so. Interesting.

    • (Score: 1) by Marvin on Thursday January 31 2019, @06:41AM (1 child)

      by Marvin (3019) on Thursday January 31 2019, @06:41AM (#794430)

      Wow! I don‘t have any knowledge in neuroscience or psychology, but this sounds damn cool!

      • (Score: 2) by Rich on Thursday January 31 2019, @03:03PM

        by Rich (945) on Thursday January 31 2019, @03:03PM (#794544) Journal

        I don‘t have any knowledge in neuroscience or psychology, but this sounds damn cool!

        Cool, until you get stuck on the wrong local maximum on "return". That would result in what they call "psychosis".

        But then, I don‘t have any knowledge in neuroscience or psychology either. I was just making some naive guesses. Haha.

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