Hepatic Estrogen Receptors in the Japanese Eel, Anguilla japonica : Characterization and Changes in Binding Capacity during Artificially-induced Sexual Maturation
スポンサーリンク
概要
- 論文の詳細を見る
Estrogen receptors were identified in cytosolic and nuclear extracts of livers of female Japanese eel, Anguilla japonica. A single class of high affinity binding sites was found, with a Kd=0.97 nM for the cytosolic estrogen receptor (cER) and Kd=0.85 nM for the nuclear estrogen receptor (nER). Binding of both the cER and the nER was specific for estrogens (diethylstilbestrol : DES>estradiol-17β : E2> >estriol : E_3>estrone : E_1). These binding characteristics of ERs were quite different from those of the serum estrogen-binding component ; [^3H]_E_2 binding to serum was not saturable, and was displaced by testosterone but not by DES, E_1 on E_3. The relationships between the levels of hepatic ERs, circulating E_2 and vitellogenin (VTG) during artificial maturation of cultivated female eels were examined, using eels injected weekly with chum salmon pituitary homogenate at a dose of 20/μg/g-body weight. Serum E_2 levels were constantly low during pre- to midvitellogenesis, and dramatically increased in the migratory nucleus stage. However, VTG levels gradually increased from early to midvitellogenesis, and were greatly elevated in the migratory nucleus stage. Hepatic cER levels slightly increased in early vitellogenesis, and then increased significantly from midvitellogenesis to the migratory nucleus stage. In contrast, nER levels did not change significantly, although nER levels in the migratory nucleus stage were higher than those at other stages. The changes in cER levels represent increased hepatic responsiveness to estrogenic stimuli during artificial maturation. Lack of change in nER levels may be a feature of artificial maturation compared to sexual maturation in nature.
- 社団法人日本動物学会の論文
- 1995-12-15
著者
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YAMAUCHI Kohei
Graduate School of Fisheries Sciences, Hokkaido University
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Yamauchi K
Hokkaido Univ. Hokkaido Jpn
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Todo T
Division Of Marine Biosciences Graduate School Of Fisheries Sciences Hokkaido University
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Adachi S
Graduate School Of Fisheries Sciences Hokkaido University
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Adachi Shinji
Department Of Biology Faculty Of Fisheries Hokkaido University
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Yamauchi Kohei
Department Of Biology Faculty Of Fisheries Hokkaido University
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SAEKI Fumihiro
Division of Marine Biosciences, Graduate School of Fisheries Sciences, Hokkaido University
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Todo Takashi
Department of Biology, Faculty of Fisheries, Hokkaido University
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Saeki Fumihiro
Department of Biology, Faculty of Fisheries, Hokkaido University
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Adachi S
Graduate School Of Fisheries Science Hokkaido University
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Saeki Fumihiro
Division Of Marine Biosciences Graduate School Of Fisheries Sciences Hokkaido University
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Adachi Shinzi
Department of Biology, Faculty of Fisheries, Hokkaido University
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Yamauchi Kohei
Department of Biological Science, Faculty of Science, Shizuoka University
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