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Endocrinology, Vol 103, 1924-1928, Copyright © 1978 by Endocrine Society

ARTICLES

Some effects of adrenalectomy in the fatty rat

Y Yukimura, GA Bray and AR Wolfsen

Function of the pituitary-adrenal axis was examined in lean and genetically obese fatty (Zucker) rats. The diurnal rhythms of plasma corticosterone and plasma ACTH were similar in both groups. The secretion of corticosterone by adrenal glands incubated in vitro with graded doses of ACTH was also comparable in lean and fatty rats. Adrenalectomy reduced food intake and weight gain in the fatty rats to levels similar to those in the lean animals and raised plasma ACTH to the same level. The injection of corticosterone (2 and 10 mg/day) increased food intake more in adrenalectomized fatty rats than in the corresponding lean ones. Progesterone increased food intake similarly in both groups. The enhanced responsiveness to corticosterone could account for many of the metabolical defects in the fatty rat.


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