5-HT1A receptor: nootropics and compounds | sci-wiki

Mescaline

Mescaline (3,4,5-trimethoxyphenethylamine) is a naturally occurring psychedelic alkaloid and the prototypical phenethylamine hallucinogen, isolated in 1897 from the peyote cactus (Lophophora williamsii) and also present in South American columnar cacti such as the San Pedro or wachuma (Trichocereus species). Archaeological evidence indicates ritual use of mescaline-bearing cacti for more than 6000 years, making it one of the oldest documented psychoactive substances. Its characteristic alterations of perception, mood, and cognition are attributed principally to agonist activity at the serotonin 5-HT2A receptor, though it binds within a similar concentration range to 5-HT2C and 5-HT1A sites. Compared with other classic psychedelics it has notably low potency, requiring gram-scale oral doses, and it is largely excreted unchanged in the urine. Renewed scientific interest in psychedelic therapeutics has returned mescaline to controlled human study after decades of neglect.

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Tryptamine

Psilocin

Psilocin (4-hydroxy-N,N-dimethyltryptamine) is the active tryptamine responsible for the effects of psilocybin mushrooms, formed in the body when psilocybin is dephosphorylated after ingestion. Structurally a close relative of serotonin, it acts as an agonist or partial agonist at serotonin 5-HT2A receptors, the defining target of the classic psychedelics, with additional activity at 5-HT2C and 5-HT1A subtypes. Its lipophilicity lets it cross the blood-brain barrier readily and reach the brain within minutes, producing a psychedelic experience lasting several hours. Beyond acute receptor signaling, psilocin promotes markers of neuronal plasticity, and a compelling recent finding is that lipophilic psychedelics like psilocin can reach intracellular 5-HT2A receptors that serotonin itself cannot access, a mechanism proposed to underlie their durable therapeutic effects. It is the molecule that ultimately mediates psilocybin's clinical antidepressant activity.

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Tryptamine

Psilocybin

Psilocybin (4-phosphoryloxy-N,N-dimethyltryptamine) is the principal psychoactive alkaloid of the Psilocybe genus of mushrooms and one of the most clinically researched classic psychedelics. It is itself essentially inactive and functions as a prodrug: after ingestion it is rapidly dephosphorylated by alkaline phosphatase to psilocin, the tryptamine that actually crosses into the brain and drives the experience through agonism at serotonin 5-HT2A receptors. In controlled clinical trials, psilocybin combined with psychological support has shown rapid and sometimes durable antidepressant effects, including a head-to-head study against the antidepressant escitalopram, alongside signals in anxiety, substance use disorders, and end-of-life distress. Neuroimaging suggests its antidepressant action may involve a transient global increase in brain network integration that outlasts the acute drug effect. It is generally physiologically well tolerated, with nausea and headache the most common adverse effects.

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Nootropic

Xaliproden

Xaliproden (SR57746A) is a synthetic 5-HT1A serotonin receptor agonist that also shows neurotrophic, NGF-like activity (nerve growth factor supports the survival and repair of neurons). It was investigated as a possible neuroprotective drug in amyotrophic lateral sclerosis (ALS), Alzheimer's disease, and chemotherapy-induced peripheral neuropathy. Trials showed modest signals but it was not approved for these uses.

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