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Am J Physiol Regul Integr Comp Physiol 255: R806-R811, 1988;
0363-6119/88 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 255, Issue 5 806-R811, Copyright © 1988 by American Physiological Society

ARTICLES

Effect of vasopressin on adrenal steroidogenesis

E. G. Schneider
Department of Physiology and Biophysics, University of Tennessee, Memphis 38163.

The direct effect of vasopressin on adrenal steroidogenesis and its effect on angiotensin II- and adrenocorticotropic hormone (ACTH)-stimulated steroidogenesis was evaluated by using an isolated perfused canine adrenal gland preparation. Infusions of vasopressin alone (50, 100, or 250 pg/ml perfusate) had no significant effect on the secretion of either aldosterone or cortisol. Infusions of vasopressin at 75 or 250 pg/ml perfusate during stimulation of steroidogenesis by angiotensin II or by ACTH did not cause a consistent increase in aldosterone secretion. In contrast, infusion of 250 but not 75 pg vasopressin/ml perfusate caused a consistent enhancement of ACTH-stimulated cortisol secretion. The infusion of a vasopressin V1-receptor agonist, but not of either a vasopressin V2-receptor agonist or oxytocin, also caused a significant enhancement of ACTH-stimulated cortisol secretion. These results suggest that the sensitivity of fasciculata cells to vasopressin is greater than that of glomerulosa cells. Finally, levels of vasopressin reported to occur in plasma during severe hemorrhage appear to be capable of enhancing cortisol secretion by a direct action on the adrenal gland via a V1-receptor mechanism.


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