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Alterations of ovarian 4-pregnen-20 -ol-3-one and adrenal corticosterone at various times after hypophysectomy, and the ovarian response to exogenous pituitary gonadotropin.

Time interval studies of ovarian 4-pregnen-20-alpha-o1-3-one (20-alpha-hydrozy-P) after hypophysectomy in rats indicates that endogenous synthesis of 20-alpha-hydroxy-P in the ovary lasts at least 4 days after hypophysectomy. Carticoidogenesis in the adrenal gland may decline within 1 hour after hypophysectomy. Ovarian function and steroidogenesis did not seem to depend on the pituitary. Time interval studies of ovarian 20-alpha-hydroxy-P after injection of FSH or LH 6 days after hypophysectomy showed that FSH alone could increase the steroid content (20-alpha-hydroxy-P) up to the levels of intact animals. The combinations of FSH plus LH caused marked elevation of 20-alpha-hydroxy-P. Ovarian response to exogenous gonadotropins took place within 5 minutes. Both LH and FSH may be indispensable for progestin brosynthesis in the rat ovary.(Authors modified)