Ethanol-like discriminative stimulus effects of non-competitive n-methyl-d-aspartate antagonists - PubMed (original) (raw)

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• PMID: 11224052

Ethanol-like discriminative stimulus effects of non-competitive n-methyl-d-aspartate antagonists

K.A. Grant et al. Behav Pharmacol. 1991 Apr.

Abstract

The discriminative stimulus effects of noncompetitive N-methyl-D-aspartate (NMDA) receptor antagonists were investigated in animals trained to discriminate 1.5g/kg (pigeons) or 1.25g/kg (mice) ethanol from vehicle. Key-pecking of pigeons and lever responding of mice were maintained under fixed ratio schedules of mixed grain or milk reinforcement, respectively. Phencyclidine (PCP) and ketamine dose-dependently substituted for the ethanol stimulus in both species, with PCP being about 10-fold more potent than ketamine. In pigeons, PCP and ketamine fully substituted for ethanol at doses that did not significantly alter rates of responding; with mice, complete substitution was accompanied by response rate-decreasing effects. In pigeons, the highly selective NMDA receptor/ionophore antagonist MK-801 also substituted for ethanol at a dose that was accompanied by reduced response rates. Compounds that did not substitute for the ethanol stimulus were cocaine (both species), the 5-HT(1B) receptor agonist TFMPP (pigeon), the H(1) receptor antagonist hydroxyzine (mice), and the anticonconvulsants phenytoin and ethosuximide (mice). The present data show that PCP-like drugs that are antagonists of NMDA receptor-mediated neurotransmission share common discriminative stimulus effects with ethanol.

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