The NMDA receptor antagonist MK-801 produces ethanol-like discrimination in the rat.

The NMDA receptor antagonist MK-801 produces ethanol-like discrimination in the rat.

Schechter M D; Meehan S M; Gordon T L; McBurney D M

Alcohol (Fayetteville, N.Y.)

1993

1993-06

Two groups of rats, one derived from N/Nih stock and the second from the (putatively) serotonin-compromised Fawn-Hooded line, were trained to discriminate ethanol from its vehicle in a drug discrimination paradigm. Once each of the two groups attained discrimination criterion, dose-response relationships with lower doses of ethanol indicated that the Fawn-Hooded rats were less sensitive (ED50 value = 579.5 mg/kg) than the N/Nih rats (ED50 = 371.4 mg/kg). Testing of various doses of the NMDA (N-methyl-D-aspartate) receptor antagonist MK-801 produced complete generalization in each group of animals, with a similar difference in ED50 values between N/Nih and Fawn-Hooded lines. These results extend previous ethanol-to-MK-801 generalization reported in pigeon, and are discussed in light of a possible NMDA-mediated contribution to the ethanol-induced discriminative stimulus cues.

Animals; Discrimination Learning/*drug effects; Dizocilpine Maleate/*pharmacology; Ethanol/*pharmacology; N-Methyl-D-Aspartate/physiology; Rats; Receptors

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197–201

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