Effect of Tranylcypromine on Adrenocortical Secretion in the Dog

Abstract
Tranylcypromine in doses of 2 mg/kg or more inhibits the output of 17-hydraxycorticoids from the adrenal following administration of ACTH in the dog. This drug, which has been used clinically as an antidepres-sant, does not interfere with the Porter-Silber method. The increase in 17-hydroxycorticoid secretion produced by angiotensin n is also inhibited. ACTH secretion is not inhibited. The drug reduces the output of cortisol and 11-deaxycortisol while increasing that of corticosterone, 11-deoxycorticosterone and aldosterone. This suggests that it acts by inhibiting adrenocortical 17[alpha]-hydroxylase.

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