Abstract
Male Wistar rats with continuous access to 6% ethanol solution and water in their home cages were subjected to food restriction (FR). Reduction of body weight to 80% of normal was associated with a significant increase in ethanol drinking. It is known that the stress of FR gives rise to increased corticosterone secretion, and in line with these findings it was found that the weight of the thymus (whose size is inversely related to corticosterone levels) was reduced to 55% of normal in the present FR rats. Two subsequent experiments indicated that this adrenal activation contributed to the FR-induced enhancement of alcohol drinking. Firstly, adrenalectomized rats showed no evidence of enhanced alcohol drinking during food restriction, suggesting that adrenal corticosterone hypersecretion contributes to the enhanced ethanol consumption during FR. Secondly, treatment of FR rats with the enzyme inhibitor cyanoketone, which blocks stress-induced but not basal corticosterone secretion, at least partly prevented the FR-induced increase in ethanol drinking. These results add further evidence that sustained exposure to corticosterone facilitates ethanol consumption in the rat.
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Hansen, S., Fahlke, C., Söderpalm, A.H.V. et al. Significance of adrenal corticosteroid secretion for the food restriction-induced enhancement of alcohol drinking in the rat. Psychopharmacology 121, 213–221 (1995). https://doi.org/10.1007/BF02245632
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DOI: https://doi.org/10.1007/BF02245632