Serum 17,20β-dihydroxy-4-pregnen-3-one Levels in Pregnant and Non-pregnant Female Rockfish, Sebastes schlegeli, Viviparous Teleost, and its Production by Post-ovulatory Follicles(Reproductive Biology)
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概要
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Changes in serum 17α,20β-dihydroxy-4-pregnen-3-one (17,20β-DP) levels around the gestation time of normal pregnant and experimentally non-pregnant females were investigated in the black rockfish, Sebastes schlegeli, a viviparous teleost. The serum 17,20β-DP in both females showed similar changes and levels, increasing from the early to late gestation periods and declining just before parturition in pregnant females and egg-release in non-pregnant females, respectively. These results suggest that the maintenance of high serum levels of 17,20β-DP after oocyte maturation is not correlated with gestation or parturition, but occurs spontaneously in this species. The decline of 17,20β-DP levels prior to egg-release in non-pregnant females tended to occur one week earlier than those prior to parturition in pregnant females, suggesting that both a decline in 17,20β-DP levels in mothers and some response from embryos are needed for a smooth parturition. The post-ovulatory follicles were maintained throughout the gestation period and produced a considerable amount of 17,20β-DP in vitro (3.44-6.96 pg/ml/mg tissue), but little estradiol-17β (0.92-1.66 pg/ml/mg tissue). The production of 17,20β-DP tended to be enhanced by the addition of a precursor steroid, pregnenolone, in the pre-, early and mid-gestation periods. These results strongly suggest that the follicle cells in black rockfish have the ability to synthesize 17,20β-DP during the post-ovulatory period, and high serum 17,20β-DP during gestation is supplied by the post-ovulatory follicles, which in Sebastes are considered to be functionally homologous to the mammalian corpus luteum.
- 社団法人日本動物学会の論文
- 2004-05-25
著者
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Nakagawa M
Graduate School Of Life Science University Of Hyogo
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Koya Y
Gifu Univ. Gifu Jpn
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Koya Yasunori
Department Of Biol. Gifu University
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Mori Hajime
Department Of Biology Graduate School Of Science Tokyo Metropolitan University Hachioji-shi
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Mori Hisanari
Department of Biology, Faculty of Education, Gifu University
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Nakagawa Masahiro
National Center for Stock Enhancement, Fisheries Research Agency
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Nakagawa Masahiro
National Center For Stock Enhancement Fisheries Research Agency
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Mori Hisanari
Department of Biology Graduate School of Science, Tokyo Metropolitan University Hachioji-shi
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