Abstract
SUMMARY The effect of aspirin in reducing adrenal ascorbic acid in Sprague—Dawley rats was studied using each animal as its own control. The response to aspirin was blocked by lesions in the region of the median eminence and by hypophysectomy. Removal of the pars nervosa also resulted in depression of the response in the majority of cases. In normal animals the dose of aspirin which produced marked reduction of adrenal ascorbic acid failed to promote antidiuresis. It was concluded that pituitary-adrenal activation by aspirin is mediated via the hypothalamus and that release of the antidiuretic hormone is not essential for this effect.
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