ACS Pharmacology & Translational Science
November 2, 2022
Eline Pottie, Marilyn Naeem, Vamshikrishna Reddy Sammeta et al.
91 citations
Psilocybin is a prodrug for psilocin, which produces psychedelic effects by activating serotonin 5-HT2A receptors. This study examined three naturally occurring compounds from psilocybin-containing mushrooms—psilocybin, baeocystin, and aeruginascin—along with their synthetic 4-acetoxy and 4-hydroxy analogues. In cell-based assays, secondary and tertiary tryptamines with 4-acetoxy or 4-hydroxy substitutions showed nanomolar affinity for several human serotonin receptor subtypes, including 5-HT2A and 5-HT1A. In mice, only the tertiary amines psilocin, psilocybin, and psilacetin induced head twitch responses (ED50 0.11–0.29 mg/kg), indicating psychedelic-like activity, which was blocked by a 5-HT2A antagonist.
IUCrData
November 27, 2020
Vamshikrishna Reddy Sammeta, Sivappa Rasapalli, Andrew R. Chadeayne et al.
4 citations
The crystal structure of the compound 4-hydroxy-N,N-di-n-propyltryptammonium (4-HO-DPT) chloride was determined. The asymmetric unit contains one protonated tryptammonium cation and one chloride anion. The ions are linked by N—H...Cl and O—H...Cl hydrogen bonds, forming ladder chains along the [010] direction.
Journal of Analytical Toxicology
May 26, 2025
Malik Schoffner, Vamshikrishna Reddy Sammeta, Marilyn Naeem et al.
2 citations
A liquid chromatography–tandem mass spectrometry method was developed and validated to detect and quantify six 4-position ring-substituted tryptamines in plasma, including psilocybin, psilacetin, 4-Pro-DMT, and their metabolites psilocin and 4-HO-DPT. The method showed linearity from 0.5 to 100 ng/mL for most analytes (psilocybin from 5 to 100 ng/mL), with acceptable bias and imprecision. Matrix effects were minimal except for ion enhancement of psilocin and psilocybin. Extraction efficiency was about 50%. Applied to plasma from male rats given psilacetin, psilacetin was not detected, and psilocin concentrations ranged up to 32.7 ng/mL. The method provides a robust tool for future research and clinical applications.
Acta Crystallographica Section E: Crystallographic Communications
March 19, 2021
Duyen N. K. Pham, Vamshikrishna Reddy Sammeta, Andrew R Chadeayne et al.
The synthesis and solid-state structure of the fumarate salt of the synthetic psychedelic 5-methoxy-N,N-diallyltryptamine (5-MeO-DALT) is reported. This work describes the chemical preparation and crystallographic characterization of this compound, providing structural details of its salt form.