A scientific first: How psychedelics bind to key brain cell receptor

September 17, 2020

Science Daily/University of North Carolina Health Care

For the first time, scientists solved the high-resolution structure of these compounds when they are actively bound to the 5-HT2A serotonin receptor on the surface of brain cells. This discovery is already leading to the exploration of more precise compounds that could eliminate hallucinations but still have strong therapeutic effects. Psilocybin - the psychedelic compound in mushrooms - has already been granted breakthrough status by the FDA to treat depression.

Psychedelic drugs such as LSD, psilocybin, and mescaline cause severe and often long-lasting hallucinations, but they show great potential in treating serious psychiatric conditions, such as major depressive disorder. To fully investigate this potential, scientists need to know how these drugs interact with brain cells at the molecular level to cause their dramatic biological effects. Scientists at UNC-Chapel Hill and Stanford have just taken a big step in that direction.

For the first time, scientists in the UNC lab of Bryan L. Roth, MD, PhD, and the Stanford lab of Georgios Skiniotis, PhD, solved the high-resolution structure of these compounds when they are actively bound to the 5-HT2A serotonin receptor (HTR2A) on the surface of brain cells.

This discovery, published in Cell, is already leading to the exploration of more precise compounds that could eliminate hallucinations but still have strong therapeutic effects. Also, scientists could effectively alter the chemical composition of drugs such as LSD and psilocybin -- the psychedelic compound in mushrooms that has been granted breakthrough status by the FDA to treat depression.

"Millions of people have taken these drugs recreationally, and now they are emerging as therapeutic agents," said co-senior author Bryan L. Roth, MD, PhD, the Michael Hooker Distinguished Professor of Pharmacology at the University of North Carolina School of Medicine. "Gaining this first glimpse of how they act at the molecular level is really important, a key to understanding how they work. Given the remarkable efficacy of psilocybin for depression (in Phase II trials), we are confident our findings will accelerate the discovery of fast-acting antidepressants and potentially new drugs to treat other conditions, such as severe anxiety and substance use disorder."

Scientists believe that activation of HTR2A, which is expressed at very high levels in the human cerebral cortex, is key to the effects of hallucinogenic drugs. "When activated, the receptors cause neurons to fire in an asynchronous and disorganized fashion, putting noise into the brain's system," said Roth, who holds a joint faculty appointment at the UNC Eshelman School of Pharmacy. "We think this is the reason these drugs cause a psychedelic experience. But it isn't at all clear how these drugs exert their therapeutic actions."

In the current study, Roth's lab collaborated with Skiniotis, a structural biologist at the Stanford University School of Medicine. "A combination of several different advances allowed us to do this research," Skiniotis said. "One of these is better, more homogeneous preparations of the receptor proteins. Another is the evolution of cryo-electron microscopy technology, which allows us to view very large complexes without having to crystalize them."

Roth credits co-first author Kuglae Kim, PhD, a postdoctoral fellow in his lab, for steadfastly exploring various experimental methods to purify and stabilize the very delicate serotonin receptors.

"Kuglae was amazing," Roth said. "I'm not exaggerating when I say what he accomplished is among the most difficult things to do. Over three years in a deliberate, iterative, creative process, he was able to modify the serotonin protein slightly so that we could get sufficient quantities of a stable protein to study."

The research team used Kim's work to reveal the first X-ray crystallography structure of LSD bound to HTR2A. Importantly, Stanford investigators then used cryo-EM to uncover images of a prototypical hallucinogen, called 25-CN-NBOH, bound together with the entire receptor complex, including the effector protein Gαq. In the brain, this complex controls the release of neurotransmitters and influences many biological and neurological processes.

The cryo-EM image is like a map of the complex, which Kim used to illustrate the exact structure of HTR2A at the level of amino acids -- the basic building blocks of proteins such as serotonin receptors.

Roth, a psychiatrist and biochemist, leads the Psychoactive Drug Screening Program, funded by the National Institute of Mental Health. This gives his lab access to hallucinogenic drugs for research purposes. Normally, these compounds are difficult to study in the lab because they are regulated by the Drug Enforcement Agency as Schedule 1 drugs.

Roth and colleagues are now applying their findings to structure-based drug discovery for new therapeutics. One of the goals is to discover potential candidates that may be able offer therapeutic benefit without the psychedelic effects.

"The more we understand about how these drugs bind to the receptors, the better we'll understand their signaling properties," Skiniotis says. "This work doesn't give us the whole picture yet, but it's a fairly large piece of the puzzle."

https://www.sciencedaily.com/releases/2020/09/200917181259.htm

Why are some mushrooms 'magic?'

Study offers evolutionary explanation, could pave way for neurological treatments

February 27, 2018

Science Daily/Ohio State University

The work helps explain a biological mystery and could open scientific doors to studies of novel treatments for neurological disease, said lead researcher Jason Slot, an assistant professor of fungal evolutionary genomics at The Ohio State University.

Mushrooms that contain the brain-altering compound psilocybin vary widely in terms of their biological lineage and, on the surface, don't appear to have a whole lot in common, he said.

From an evolutionary biology perspective, that is intriguing and points to a phenomenon in which genetic material hops from one species to another -- a process called horizontal gene transfer, Slot said. When it happens in nature, it's typically in response to stressors or opportunities in the environment.

He and his co-authors examined three species of psychedelic mushrooms -- and related fungi that don't cause hallucinations -- and found a cluster of five genes that seem to explain what the psychedelic mushrooms have in common.

"But our main question is, 'How did it evolve?'" Slot said. "What is the role of psilocybin in nature?"

Slot and his co-authors found an evolutionary clue to why the mushrooms gained the ability to send human users into a state of altered consciousness. The genes responsible for making psilocybin appear to have been exchanged in an environment with a lot of fungus-eating insects, namely animal manure.

Psilocybin allows fungi to interfere with a neurotransmitter in humans and also insects, which are probably their bigger foe. In flies, suppression of this neurotransmitter is known to decrease appetite.

"We speculate that mushrooms evolved to be hallucinogenic because it lowered the chances of the fungi getting eaten by insects," Slot said. The study appears online in the journal Evolution Letters.

"The psilocybin probably doesn't just poison predators or taste bad. These mushrooms are altering the insects' 'mind' -- if they have minds -- to meet their own needs."

And the reason that unrelated species have the same genetic protection probably comes down to the fact that they commonly grow in the same insect-rich mediums: animal feces and rotten wood.

This work could guide medical science by pointing researchers in the direction of other molecules that could be used to treat disorders of the brain, Slot said.

Psilocybin has been studied for the treatment of a variety of mental disorders, including treatment-resistant depression, addiction and end-of-life anxiety. A handful of researchers in the U.S. are looking at potential treatment applications, and much of the work is happening abroad. Strict drug laws have delayed those types of studies for decades, Slot said.

https://www.sciencedaily.com/releases/2018/02/180227115548.htm