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Regulation of 21-hydroxylase activity by steroids in cultured bovine adrenocortical cells: possible significance for adrenocortical androgen synthesis.

When primary bovine adrenocortical cells were cultured in a serum- and lipoprotein-free medium, the pattern of steroids synthesized from pregnenolone precursor was altered by prior treatment with ACTH and by prior exposure to pregnenolone. As evidenced by the high performance liquid chromatographic profile of steroids synthesized from pregnenolone, ACTH induced 17-hydroxylase activity, whereas, regardless of ACTH treatment, prior exposure to pregnenolone reduced 21-hydroxylase activity. Direct addition of possible secreted products of pregnenolone—androstenedione, progesterone, and 17-hydroxyprogesterone (17-hydroxypregn-4-ene-3,20-dione)—was found to cause loss of 21-hydroxylase activity measured as 21-deoxycortisol (llβ,17-dihydroxypregn-4-ene-3,20-dione) conversion to cortisol. Several steroids that caused loss of 11β-hydroxylase activity did not affect 21-hydroxylase. Androstenedione suppressed both 21- and llβ-hydroxylase but did not affect 17-hydroxylase or C17,20-lyase activities. The time course o...