Abstract
The effects of various mammalian gonadotropins (ovine-LH, ovine-FSH, HCG) and a fish gonadotropin (partially purified chinook salmon gonadotropin; SG-G100) on in vitro estradiol-17β production by oocytes surrounded by follicle layers (follicles) of amago salmon are examined. The accumulation of estradiol-17β in both tissues and media is stimulated by SG-G100 in a dose-dependent fashion. Estradiol-17β release into the medium after the addition of SG-G100 is observed after 1.5 hr and reaches maximal levels by 12 hr. Ovine-LH (100 μg, 10 μg/ml) is effective in stimulating estradiol-17β production. A dose of 100 μg/ml LH is approximately equivalent to 0.1–1 μg SG-G100. HCG (100 IU, 10 IU/ml) slightly but significantly increases estradiol-17β production, while estradiol-17β production is not significantly stimulated by ovine-FSH (0.1–10 μg/ml). These results provide evidence that gonadotropin directly controls estradiol-17β production in amago salmon follicles.
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