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How LSD, psilocybin reduce depression discovered

Posted by Hugh on June 7, 2023, at 12:14:26

For several years, mental health specialists have known that psychedelic drugs like magic mushrooms and LSD can reduce symptoms in patients with chronic depression. But until now, it was not known how such compounds function. While most in the field suspected it was a chemical present in both kinds of compounds, others insisted it was the hallucinogenic trips associated with such drugs that brought relief. The researchers with this new effort have found that it is the former.

The research team added psilocin or LSD to cells in a petri dish in their lab and then looked at what occurred under a microscope. More specifically, they watched the interactions between chemicals in the compounds and receptor cells to see which might bind. After a trial-and-error process, they finally discovered that some of the chemicals were binding to the receptor TrkB -- the same receptor targeted by drugs developed to treat depression -- only they were creating bonds that were 1,000 times stronger. They also found that the result of such strong bonding was an increase in neuroplastic activity -- the mechanism believed to be responsible for the reduction of depression symptoms.

Intrigued by their findings, the researchers gave doses of LSD or psilocin to mice driven to depression by exposure to stressful situations. They then dissected their brains and found the same type of binding they had observed in the petri dishes. They also found that the antidepressant effects from the binding were independent of the effects of chemicals in the drugs that altered serotonin receptors, which are responsible for inducing psychedelic experiences and hallucinations. And that means that the team may have found a way to treat patients without inducing such experiences.

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