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JOURNAL ARTICLE
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
MK-801 administration during ethanol withdrawal in neonatal rat pups attenuates ethanol-induced behavioral deficits.
Alcoholism, Clinical and Experimental Research 1997 October
Alcohol exposure during development can produce central nervous system dysfunction, resulting in a wide range of behavioral alterations. The various mechanisms by which alcohol causes these behavioral changes, however, remain unknown. One mechanism that has been suggested is NMDA receptor-mediated excitotoxic cell death produced by ethanol withdrawal. The present study examined whether MK-801, an antagonist of the NMDA receptor that has been shown to protect against NMDA receptor-mediated excitotoxicity, could block alcohol's adverse effects on behavior. Sprague-Dawley rat pups were exposed to alcohol (6.0 g/kg) in a binge-like manner on postnatal day 6 using an artificial rearing procedure. Subjects then received an injection of MK-801 (0.1 mg/kg) or vehicle during withdrawal, 21 hr after ethanol exposure. At postnatal day 40, all subjects were tested on a serial spatial discrimination reversal task. Ethanol-exposed subjects were impaired in both discrimination and reversal learning, and committed a significantly greater number of perseverative-type errors, compared with controls. MK-801 administration during ethanol withdrawal significantly attenuated ethanol-induced deficits in reversal learning and increases in perseverative-type errors, whereas MK-801 exposure by itself had no significant effect on performance. Thus, exposure to MK-801 during ethanol withdrawal partially protected against alcohol-related disruptions in spatial reversal learning. These results support the suggestion that NMDA receptor-mediated excitotoxicity may be one mechanism by which alcohol induces behavioral teratogenicity.
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