Circadian Changes in Serum Concentrations of Steroids in Japanese Char Salvelinus leucomaenis at the Stage of Final Maturation(Reproductive Biology)
スポンサーリンク
概要
- 論文の詳細を見る
Circadian changes in serum concentrations of testosterone (T), 11-ketotestosterone (11KT), estradiol-17β (E2), 17α, 20β-dihydroxy-4-pregnen-3-one (DHP), 17α-hydroxyprogesterone (OHP), cortisol (F) and progesterone (P) were investigated in the spermiated/ovulated Japanese char Salvelinus leucomaenis for over three days using newly developed time-resolved fluoroimmunoassays. Testosterone and DHP in both sex and 11 KT in male showed significantly (P<0.05) higher serum levels just before/after onset of darkness (15 : 00 or 18:00), and the levels during night and daytime were significantly (P<0.05) lower than those of the peak levels. Serum F levels in both sex during dark phase were significantly (P<0.05) higher than those levels during daytime. A surge of serum OHP concentrations in both sexes was observed at the time of twilight (03 : 00). The peak time of serum T, 11KT and DHP levels were approximately 6 hours prior to those of serum F and OHP levels. Serum E2 in female and P in both sex fluctuated intensely during sampling period, and did not show remarkable changes. These results strongly suggest the existence of circadian-like diel changes in serum T, DHP, F and OHP levels in both sex and 11KT in male, and no variations in serum E2 in female and P in both sex in spermiated/ovulated Japanese char under the stage of final maturation. Furthermore, relationship between circadian rhythms of steroid hormones and spawning behaviors are discussed in the present study.
- 2002-08-25
著者
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Yamada H
Fisheries Res. Inst. Mie Mie Jpn
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YAMADA HIDEAKI
School of Fisheries Sciences, Kitasato University
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IWATA MUNEHICO
School of Fisheries Sciences, Kitasato University
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KAMBEGAWA Akira
The Kambegawa Laboratory
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Chiba Hiroaki
School of Fisheries Sciences, Kitasato University
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Satoh Ryohei
Department Of Physiology Kitasato University Graduate School Of Medical Science
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Chiba H
B.p. Bishop Museum Honolulu Hawaii U.s.a.
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Hakuba Takeshi
School Of Fisheries Sciences Kitasato University
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Iwata M
School Of Fisheries Sciences Kitasato University
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Iwata Munehico
School Of Fisheries Sciences Kitasato University
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Yamada H
Laboratory Of Mineral Nutrition Division Of Human Nutrition Incorporated Administrative Agency Of He
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Kambegawa A
Kambegawa Laboratory
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Satoh Ri-ichi
School of Fisheries Sciences, Kitasato University
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Ogoh Masashi
School of Fisheries Sciences, Kitasato University
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Takaji Keigo
School of Fisheries Sciences, Kitasato University
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Fujimoto Yasufumi
School of Fisheries Sciences, Kitasato University
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Satoh R
Department Of Physiology Kitasato University Graduate School Of Medical Science
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Chiba Hiroaki
School Of Fisheries Sciences Kitasato University
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Ogoh Masashi
School Of Fisheries Sciences Kitasato University
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Takaji Keigo
School Of Fisheries Sciences Kitasato University
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Fujimoto Yasufumi
School Of Fisheries Sciences Kitasato University
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Yamada Hideaki
School Of Fisheries Sciences Kitasato University
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