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- W2004990513 abstract "Adult female catfish received an im injection of 454 IU hCG in 0.2 ml saline. Sixteen hours later, the ovarian tissue from the hCG-treated or control fish was aerobically incubated in vitro with 4-[14C]progesterone or 17α-hydroxyprogesterone at 30° for 60 min. When progesterone was employed as the substrate, significant production of androstenedione and testosterone was observed in the control group. However, after the hCG injection, a markedly higher amount of 20β-hydroxy-4-pregnen-3-one was produced. Furthermore, the androgen production was diminished, and the production of 5β-reduced C21 metabolites such as 5β-pregnane-3,20-dione and 3α-hydroxy-5β-pregnan-20-one was also reduced in the hCG-treated group. From 17α-hydroxyprogesterone as a substrate, considerable amounts of androstenedione and testosterone were obtained as the metabolites in the control group. However, after the hCG treatment, production of 17α,20β-dihydroxy-4-pregnen-3-one (17α,20β-diOHprog) and its 5β-reduced metabolite was markedly stimulated, while the androgen production was reduced drastically. By evaluating the yield of each product, it was suggested that the tentatively calculated activity of 17α-hydroxylase and C-17-C-20 lyase was diminished by the hCG treatment and that 20β-hydroxysteroid dehydrogenase was activated. It indicates that hCG changed the ovarian steroidogenic pathway from androgen production to formation of 17α,20β-diOHprog, an inducer of germinal vesicle breakdown." @default.
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- W2004990513 date "1989-11-01" @default.
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- W2004990513 title "Change of steroidogenic pathways in the ovary of a tropical catfish, Clarias macrocephalus, Gunther, after hCG treatment" @default.
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- W2004990513 doi "https://doi.org/10.1016/0016-6480(89)90153-6" @default.
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