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Effect of adrenalectomy and exposure to corticosterone on alcohol intake in alcohol-preferring and alcohol-avoiding rat lines.

The daily fluid intake of male rats of the alcohol-preferring (AA) and alcohol-avoiding (ANA) lines with simultaneous access to 10% (v/v) ethanol and water was determined during a baseline period (2 weeks), following adrenalectomy (1 week), and for 2 weeks following corticosterone treatment. The results showed that adrenalectomized AA rats decreased their ethanol intake compared to the sham-operated AA controls and that treatment with corticosterone restored the intake of ethanol to that observed during the baseline period. In contrast to the AA rats, there were no alterations in ethanol intake after adrenalectomy and following corticosterone replacement in the ANA rats. These results suggest that corticosterone stimulates ethanol intake in animals with pronounced high preference for ethanol.