AJP - Endocrinology and Metabolism, Vol 240, Issue 2 131-E135, Copyright © 1981 by American Physiological Society

ARTICLES

Corticosterone secretion after inhibition of prostaglandin synthesis by indomethacin

M. E. Thompson and G. A. Hedge

Systemic indomethacin (Ind) administration decreased prostaglandin F (PGF) content of the rat adrenal to less than 1.4 pg/mg. This was less than 5% of the adrenal PGF content in the gelatin-treated (Gel) control group (34 pg/mg). Basal plasma corticosterone levels were increased by the Ind treatment. Since the calculated metabolic clearance rate for corticosterone was unchanged, this increase was attributed to an enhanced adrenal secretion rate that was secondary to elevated plasma ACTH concentration. Ether exposure in the presence of Ind did not stimulate a normal rise in plasma corticosterone or adrenal corticosteroidogenesis. Adrenal responsiveness to exogenous ACTH was reduced after Ind treatment. There was a normal rise in plasma ACTH levels following ether exposure confirming the adrenal as the site of inhibition. Systemic Ind treatment thus appears to have two sites of action in altering plasma corticosterone levels: 1) a direct effect on the adrenal, inhibiting normal secretion in response to acute elevations of plasma ACTH, and 2) an action at the pituitary or hypothalamic level, eliciting an increase in basal ACTH secretion.

This article has been cited by other articles:

				S. G. Rhind, G. A. Gannon, M. Suzui, R. J. Shephard, and P. N. Shek Indomethacin inhibits circulating PGE2 and reverses postexercise suppression of natural killer cell activity Am J Physiol Regulatory Integrative Comp Physiol, May 1, 1999; 276(5): R1496 - R1505. [Abstract] [Full Text] [PDF]