Discriminative stimulus effects of 1-(2,5-dimethoxy-4-methylphenyl)-2-aminopropane in rhesus monkeys: antagonism and apparent pA2 analyses.
Jun-Xu Li, Kenner C Rice, Charles P France
The Journal of pharmacology and experimental therapeutics March 1, 2009 DOI: 10.1124/jpet.108.145458 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Discriminative stimulus paradigm with Schild analysis Peer reviewed |
|---|---|
| Sample size | 4 |
| Population | Adult rhesus monkeys |
| Interventions | DOM 2C-T-7 DPT MDL100907 ketanserin ritanserin |
| Dose | 0.32 mg/kg s.c. DOM |
| Topics | Serotonin |
| Keywords | Serotonin receptor 5-HT Receptor Receptor subtype 5-ht2a receptor affinity Receptor mediation Psychoactive effects Psychoactive compounds Discriminative stimulus effects Distinct sensations Perception Neuropharmacology Brain Receptor pharmacology Antagonists Schild analysis Primate research Rhesus monkeys Animal research Animal model |
| Citations | 16 |
| Key points | The 5-HT₂A receptor predominantly mediates the discriminative stimulus effects of DOM, 2C-T-7, and DPT in rhesus monkeys. |
Abstract
Discriminative stimulus effects of the serotonin (5-HT) receptor agonist 1-(2,5-dimethoxy-4-methylphenyl)-2-aminopropane (DOM) have been studied in rats and, more recently, in rhesus monkeys. This study examined DOM, 2,5-dimethoxy-4-(n)-propylthiophenethylamine (2C-T-7), and dipropyltryptamine hydrochloride (DPT) alone and in combination with three antagonists, MDL100907 [(+/-)2,3-dimethoxyphenyl-1-[2-(4-piperidine)-methanol]], ketanserin [3-[2-[4-(4-fluorobenzoyl)piperidin-1-yl]ethyl]-1H-quinazoline-2,4-dione], and ritanserin [6-[2-[4-[bis(4-fluorophenyl)methylidene]piperidin-1-yl]ethyl]-7-methyl-[1,3]thiazolo[2,3-b]pyrimidin-5-one], to identify the 5-HT receptor subtype(s) that mediates the discriminative stimulus effects of these 5-HT receptor agonists. Four adult rhesus monkeys discriminated between 0.32 mg/kg s.c. DOM and vehicle while responding under a fixed ratio 5 schedule of stimulus shock termination. DOM, 2C-T-7, and DPT dose-dependently increased responding on the DOM-associated lever. MDL100907 (0.001-0.01 mg/kg), ketanserin (0.01-0.1 mg/kg), and ritanserin (0.01-0.1 mg/kg) each shifted the dose-response curves of DOM, 2C-T-7, and DPT rightward in a parallel manner. Schild analysis of each drug combination was consistent with a simple, competitive, and reversible interaction. Similar apparent affinity (pA(2)) values were obtained for MDL100907 in combination with DOM (8.61), 2C-T-7 (8.58), or DPT (8.50), for ketanserin with DOM (7.67), 2C-T-7 (7.75), or DPT (7.71), and for ritanserin with DOM (7.65), 2C-T-7 (7.75), or DPT (7.65). Potency of antagonists in this study was correlated with binding affinity at 5-HT(2A) receptors and not at 5-HT(2C) or alpha(1) adrenergic receptors. This study used Schild analysis to examine receptor mechanisms mediating the discriminative stimulus effects of hallucinogenic drugs acting at 5-HT receptors; results provide quantitative evidence for the predominant, if not exclusive, role of 5-HT(2A) receptors in the discriminative stimulus effects of DOM, 2C-T-7, and DPT in rhesus monkeys.