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Influence of androgen on the GnRH-stimulated secretion and biosynthesis of gonadotropins in the pituitary of juvenile female bullfrogs, Rana catesbeiana.

The influence of androgen on pituitary sensitivity to gonadotropin-releasing hormone (GnRH) was investigated in juvenile female bullfrogs. Newly metamorphosed bullfrogs were treated in vivo for 7 days or their pituitaries were treated in vitro for 24 hr with 5 alpha-dihydrotestosterone (DHT). Pituitary sensitivity to GnRH was assessed by incubating glands with 100 ng/ml GnRH. The secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) was quantified by separate radioimmunoassays. Gth biosynthesis was quantified using immunoprecipitation to measure the incorporation of [35S]methionine. Prior exposure to DHT, in vitro or in vivo, significantly elevated the GnRH-induced secretion of LH and FSH. However, DHT had a differential influence on the two gonadotropins; both the basal and the GnRH-induced secretion of LH was enhanced, whereas only the GnRH-induced secretion of FSH was elevated. DHT did not significantly alter Gth biosynthesis. Treating older frogs (5 months postmetamorphic) in vivo with DHT (for 7 days) combined with a GnRH agonist (GnRHa) for 3 days enhanced the GnRH-stimulated Gth biosynthesis compared to treatment with either DHT or GnRHa alone. Therefore, while DHT may act on the pituitary to enhance gonadotropin secretion in response to GnRH, this action does not result in a concomitant increase in Gth biosynthesis. Juvenile female bullfrogs may require an increase in both GnRH and DHT in order to stimulate Gth biosynthesis.