Changes in Expression of Prolactin- and Cortisol-receptor Genes during Early-life Stages of Euryhaline Tilapia (Oreochromis mossambicus) in Fresh Water and Seawater
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概要
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Expression of prolactin receptor (PRLR) and cortisol receptor (CR) mRNAs was examined during early-life stages of euryhaline Mozambique tilapia (Oreochromis mossambicus) by competitive reverse transcription-polymerase chain reaction (cRT-PCR). Concentration of prolactin receptor mRNA was higher in the gills of mature fish reared in fresh water (FW) than in those reared in seawater (SW), whereas no difference was seen in CR mRNA. Whole eggs just after fertilization contained the receptor mRNAs for both prolactin and cortisol. The concentration of PRLR mRNA increased gradually as the embryo grows both in FW and in SW. On the other hand, the concentration of CR mRNA was highest in the egg just after fertilization, decreased rapidly toward hatching, and increased slightly thereafter. When embryos 3 days before hatching were transferred to SW, the levels of PRLR mRNA were significantly lower at the time of hatching and also 3 days after hatching than in the embryo and larvae maintained in FW. Environmental salinity did not affect CR mRNA content at any stage examined. Both PRLR and CR mRNAs were identified in the yolk-sac membrane and in the embryonic body. Significantly more PRLR gene was expressed in the embryonic body developing in FW than in SW, whereas no difference was seen in the yolk-sac membrane. The greater expression of PRLR gene in embryos and larvae developing in FW than in those in SW clearly indicates the presence of regulatory mechanisms of gene expression in early-life stages of tilapia.
- 社団法人日本動物学会の論文
- 1999-02-15
著者
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Mori Takao
Department Of Cardiology Miki City Hospital
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HIRANO Tetsuya
Ocean Research Institute, University of Tokyo
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Matsuda Manabu
Department of Biological Sciences, Graduate School of Sciences, University of Tokyo
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Matsuda Manabu
Department Of Biological Science Graduate School Of Science University Of Tokyo
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Hirano Tetsuya
Ocean Research Institute University Of Tokyo
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Shiraishi Kiyono
Department of Biological Science, Graduate School of Science, University of Tokyo
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Shiraishi Kiyono
Department Of Biological Science Graduate School Of Science University Of Tokyo:ocean Research Insti
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Mori Takao
Department Of Biological Science Graduate School Of Science University Of Tokyo
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Mori Takao
Department Of Applied Chemistry School Of Science And Engineering Waseda University
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Hirano Tetsuya
Ocean Research Institute University Of Tokyo:(present Address)hawaii Institute Of Marine Biology Uni
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Hirano Tetsuya
Ocean Research Institute University
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