Changes in Salmon GnRH and Chicken GnRH-II Contents in the Brain and Pituitary, and GTH Contents in the Pituitary in Female Masu Salmon, Oncorhynchus masou, from Hatching through Ovulation(Endocrinology)
スポンサーリンク
概要
- 論文の詳細を見る
Changes in salmon gonadotropin-releasing hormone (sGnRH) and chicken GnRH-II (cGnRH-II) contents in the brain and pituitary, and gonadotropin (GTH) subunits GTH Iβ and GTH Iiβ contents in the pituitary of female masu salmon (Oncorhynchus masou) were investigated from hatching through ovulation. Gonadosomatic index (GSI) showed a gradual increase until the second summer (two year-olds), and thereafter a rapid increase was observed in accordance with vitellogenesis. Ovulation occurred in autumn. Brain sGnRH was already measurable at hatching, whereas cGnRH-II was first detected two months later. Both GnRHs contents increased during the underyearling phase, and fluctuated thereafter. Pituitary sGnRH contents showed a stepwise increase every summer for three years. sGnRH concentrations in each discrete brain area showed seasonal changes: high during autumn-winter and low in summer. sGnRH concentrations in the olfactory bulbs and telencephalon, and pituitary contents of sGnRH, GTH Iβ and GTH Iiβ significantly increased prior to ovulation. Pituitary GTH Iβ contents showed clear seasonal changes for three years-high in autumn and low in winter-regardless of the state of ovarian maturity. Brain cGnRH-II contents were lower than sGnRH contents. Moreover, pituitary cGnRH-II contents were undetectable and no significant changes in concentration in discrete brain areas were observed during vitellogenesis and ovulation. These results suggest that sGnRH is involved in ovarian maturation via the regulation of GTH synthesis and release in this species, whereas cGnRH-II has little or no involvement in reproduction.
- 社団法人日本動物学会の論文
- 1992-04-15
著者
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Aida Katsumi
Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University
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Hasegawa Yoshihisa
Department Of Animal Science Faculty Of Agriculture Tohoku University:(present Address) Department O
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Amano M
School Of Marine Biosciences Kitasato University
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Amano Masafumi
School Of Fisheries Sciences Kitasato University Sanriku
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Aida Katsumi
Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of
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Aida Katsumi
Department Of Aquatic Bioscience Graduate School Of Agricultural And Sciences The University Of Toky
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Hasegawa Yoshihisa
Department Of Obstetrics And Gynecology Gunma University School Of Medicine
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OKUMOTO Naoto
Nikko Branch, National Research Institute of Aquaculture
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AMANO MASAFUMI
Department of Fisheries, Faculty of Agriculture, The University of Tokyo
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Okumoto N
Nikko Branch National Research Institute Of Aquaculture
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Amano Masafumi
Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of
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Okumoto Naoto
Nikko Branch National Research Institute Of Aquaculture
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