Abstract
Polycystic ovaries were induced in thyroidectomized rabbits by the administration of either 25 IU human chorionic gonadotrophin or 10 IU pregnant mare serum daily for a period of 20 days. Cystic ovaries in rabbits exhibited subnormal (P < 0.01) ovarian delta 5-3 beta-hydroxysteroid dehydrogenase (3 beta-HSD) concentration and specific activity. Since weight of cystic ovaries was markedly elevated, however, total capacity for delta 4-3-ketosteroid production was enhanced. Concomitant administration of chorionic gonadotrophin and aminoglutethimide phosphate to thyroidectomized rabbits prevented the formation of cystic ovaries indicating that a steroid, or steroids formed beyond cholesterol in the biosynthesis pathway is necessary for the experimental induction of cystic ovaries in this laboratory animal.
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