Behav Neurosci. 2003 Jun;117(3):641-9.

Bivalent effects of MK-801 on ethanol-induced sensitization do not parallel its effects on ethanol-induced tolerance.

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Portland Alcohol Research Center, Oregon Health & Science University, Research Service, Veterans Affairs Medical Center, Portland, Oregon, USA.

Abstract

The relationship between the effects of the N-methyl-D-aspartate (NMDA) antagonist MK-801 on acute responses to ethanol and its ability to block ethanol sensitization and tolerance was examined in DBA/2J mice. Cross-sensitization between these drugs was also studied. Repeated administration of 0.1 mg/kg MK-801 with ethanol potentiated, whereas 0.25 mg/kg attenuated, sensitization to ethanol's locomotor stimulant effects; rearing was similarly affected. There was evidence for cross-sensitization between ethanol and 0.25 mg/kg MK-801. MK-801 potentiated ethanol's ataxic effects in the grid test, but had no effect on tolerance to this effect. MK-801's effects on ethanol sensitization appeared to be related to its own behavioral effects, rather than NMDA receptor blockade per se. Further, these studies demonstrate dissociation between ethanol sensitization and tolerance.

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