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Abstract
Acute intraperitoneal administration of ethanol to rats causes a dose-dependent transient hypothermia. On repeated exposure, however, rats develop tolerance to hypothermic effects of ethanol. Cyclo(His-Pro), an endogenous brain peptide, modifies both acute and chronic themomodulatory effects of alcohol. For example, a) acute pretreatment of rats with increasing amounts of cyclo(His-Pro) produces a progressive decrease in ethanol hypothermia, and b) chronic cyclo(His-Pro) administration augments the development of tolerance to hypothermic effects of alcohol. While the mechanism of cyclo(His-Pro) action is not clear, these data are interpreted to suggest that this peptide may play important roles in ethanol intoxication, preference, tolerance, and/or addiction.
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