Effects of N-Methyl- d-Aspartate Receptor Antagonists on Reinforced and Nonreinforced Responding for Ethanol in Rats

Results of several recent studies indicate that the discriminative stimulus effects of ethanol are related, at least partially, to ethanol-induced decrease in the N-Methyl- d-aspartate (NMDA) receptor function. The role of NMDA receptors in ethanol reinforcement remains still unclear. The aim of the...

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Veröffentlicht in:Alcohol (Fayetteville, N.Y.) N.Y.), 1999-06, Vol.18 (2), p.131-137
Hauptverfasser: Bienkowski, Przemyslaw, Koros, Eliza, Kostowski, Wojciech, Danysz, Wojciech
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Koros, Eliza
Kostowski, Wojciech
Danysz, Wojciech
description Results of several recent studies indicate that the discriminative stimulus effects of ethanol are related, at least partially, to ethanol-induced decrease in the N-Methyl- d-aspartate (NMDA) receptor function. The role of NMDA receptors in ethanol reinforcement remains still unclear. The aim of the present study was to evaluate the effects of two novel NMDA receptor antagonists in rats lever pressing for 8% ethanol in the oral self-administration procedure. In addition, the effects of the drugs on intensity of nonreinforced responding for ethanol (i.e., “experimental craving”) were examined in the extinction procedure. To assess selectivity of the drugs' actions the same range of doses was tested in rats lever pressing for water (control experiments). A low-affinity, uncompetitive NMDA receptor antagonist, MRZ 2/579 (2.5–7.5 mg/kg) selectively and dose-dependently decreased ethanol self-administration. This compound exerted also selective effects on nonreinforced responding for ethanol with lower dose (2.5 mg/kg) increasing and higher dose (5 mg/kg) suppressing operant behavior in the extinction procedure. MRZ 2/579 (5 mg/kg) did not alter open field activity when given in combination with either saline or ethanol (0.5–1 g/kg). In contrast, a glycine B site antagonist, MRZ 2/576 (2.5–7.5 mg/kg) did not produce any selective effects on either reinforced or nonreinforced lever pressing for ethanol. The present results suggest that MRZ 2/579 may selectively suppress both ethanol self-administration and experimental ethanol craving.
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ispartof Alcohol (Fayetteville, N.Y.), 1999-06, Vol.18 (2), p.131-137
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source MEDLINE; ScienceDirect Journals (5 years ago - present)
subjects Alcoholism and acute alcohol poisoning
Animals
Behavior, Animal - drug effects
Biological and medical sciences
Central Nervous System Depressants - pharmacology
Cyclopentanes - pharmacology
Drinking - drug effects
Ethanol - pharmacology
Ethanol craving
Ethanol self-administration
Glycine B site antagonists MRZ 2/579
Male
Medical sciences
Motor Activity - drug effects
MRZ 2/576
Phthalazines - pharmacology
Rat
Rats
Rats, Wistar
Receptors, N-Methyl-D-Aspartate - antagonists & inhibitors
Reinforcement (Psychology)
Toxicology
Uncompetitive NMDA receptor antagonists
title Effects of N-Methyl- d-Aspartate Receptor Antagonists on Reinforced and Nonreinforced Responding for Ethanol in Rats
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