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There is considerable evidence that CRH can suppress food intake. As hypothalamic CRH, a main site of CRH expression, is also negatively regulated by glucocorticoids, it is unclear whether anorexia and weight loss in adrenal insufficiency are attributable to elevated CRH or to decreased glucocorticoid levels. To distinguish these possibilities, we have measured food intake and body weight in wild-type and CRH-deficient mice after sham adrenalectomy (Sham ADX) or adrenalectomy (ADX) with and without corticosterone (B) replacement. CRH deficiency neither increased basal food intake and body weight nor attenuated decreases in food intake after ADX or Sham ADX. B replacement producing plasma levels above the circadian peak completely blocked ADX-induced decreases in feeding and body weight in all mice and frequently stimulated food intake in CRH-deficient mice. Plasma levels of insulin and leptin, two other hormones involved in appetite regulation, did not differ between genotypes; however, the relationship between food intake and circulating leptin was significantly less negative at B doses that preserved appetite. B replacement levels slightly below circadian peak concentrations did not prevent hypophagia after ADX. We conclude that factors other than or in addition to CRH are more important in mediating appetite responses to adrenalectomy.

endocrinology

Glucocorticoid Replacement, but not Corticotropin-Releasing Hormone Deficiency, Prevents Adrenalectomy-Induced Anorexia in Mice**Portions of this work were presented at the 10th International Congress of Endocrinology, San Francisco, California, June 12–13, 1996. This work was supported in part by grants to the author from the NIH (DK-49333) and the National Alliance for Research on Schizophrenia and Depression.