Abstract
The FAST and SLOW lines of mice are being selectively bred in replicate for differential sensitivities to the locomotor activating effects of ethanol. Whereas FAST-1 and FAST-2 mice are stimulated by 2.0 g/kg ethanol, SLOW-1 and SLOW-2 mice are not stimulated, and are often depressed, by this dose. The dopamine antagonists, SCH-23390 (D1) and raclopride (D2), produced dose-dependent decreases in the locomotor activity of EtOH-naive mice of both lines and replicates; however, FAST and SLOW mice were not differentially sensitive to these effects. The absence of a line difference in activity response to the dopamine antagonists suggests that dopamine receptor function has not been altered by selective breeding for differences in sensitivity to the stimulant effects of ethanol. The ethanol-stimulated activity of FAST-1 and FAST-2 mice was decreased by administration of the dopamine antagonists, haloperidol and raclopride, at doses that had no effect on basal locomotor activity. SCH-23390 decreased ethanol-stimulated activity of FAST-1, but not FAST-2 mice. The ethanol-induced activity changes of SLOW mice were generally unaffected by antagonist administration. These results suggest a role for dopaminergic systems in mediating ethanol-stimulated activity in selectively bred FAST mice. Coadministration of SCH-23390 and raclopride decreased ethanol-induced activation to a greater degree than either drug alone, further suggesting that both D1 and D2 receptor systems contribute to the full expression of the ethanol stimulant response.
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This work was supported by the Department of Veterans Affairs, by NIAAA grants AA06498 and AA08621 (J.C.C. and T.J.P.), and by an N. L. Tartar Research Fellowship from the Medical Research Foundation of Oregon (E.H.S.). A portion of this work was completed in partial fulfillment of the requirements for Master of Science degree, Department of Medical Psychology, Oregon Health Sciences University (E.H.S.).
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Shen, E.H., Crabbe, J.C. & Phillips, T.J. Dopamine antagonist effects on locomotor activity in naive and ethanol-treated FAST and SLOW selected lines of mice. Psychopharmacology 118, 28–36 (1995). https://doi.org/10.1007/BF02245246
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DOI: https://doi.org/10.1007/BF02245246