Disturbance of Plasma Melatonin Profile by High Dose Melatonin Administration Inhibits Testicular Maturation of Precocious Male Masu Salmon(Endocrinology)
スポンサーリンク
概要
- 論文の詳細を見る
We have previously shown that the testicular development of underyearling male masu salmon Oncorhynchus masou reared under a long photoperiod was accelerated by oral melatonin treatment (0.5mg melatonin/kg body weight/day), suggesting that melatonin mediates photoperiodic signaling. In this study, we further examined the effects of a disturbance in the plasma melatonin profile on gonadal development in underyearling male masu salmon by administering a higher dose of melatonin. Fish randomly selected in June were devided into two groups. They were reared under a light:dark (LD) cycle of 16:8 (lights on 04:00-20:00 hr) and fed with pellets sprayed with melatonin or vehicle twice a day at 08:30 and at 15:30 hr (7.5mg melatonin/kg body weight/day) until October. Fish were sampled on Day 0, 25, 60, 90 and 120. The plasma melatonin levels were high in the dark phase and low in the light phase in the control group, while they were constantly high with no significant change in the melatonin-treated group. Melatonin treatment had inhibitory effects on the gonadosomatic index and plasma testosterone levels. Pituitary salmon gonadotropin-releasing hormone content and luteinizing hormone content were significantly lower in the melatonin-treated group on Day 60 and 90, respectively. These results indicate that the plasma melatonin profile is important for mediating photoperiodic signals that regulate brain-pituitary-gonadal axis in underyearling precocious male masu salmon.
- 社団法人日本動物学会の論文
- 2004-01-25
著者
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IIGO Masayuki
Department of Applied Biochemical Science, Faculty of Agriculture, Utsunomiya University
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Okuzawa Koichi
National Research Institute of Aquaculture, Fisheries Research Agency
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Iigo M
Department Of Applied Biochemistry Faculty Of Agriculture Utsunomiya University
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Iigo Masayuki
Utsunomiya Univ. Tochigi Jpn
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Ichikawa M
Mie Univ. Mie Jpn
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Iigo Masayuki
Department Of Applied Biochemistry Faculty Of Agriculture Utsunomiya University
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Iigo Masayuki
Department Of Anatomy St. Marianna University School Of Medicine
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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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Okubo K
Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of
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Okubo Kataaki
Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of
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Kitamura S
Japan International Research Center For Agricultural Sciences
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YAMAMORI Kunio
School of Fisheries Sciences, Kitasato University
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YAMADA HIDEAKI
School of Fisheries Sciences, Kitasato University
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Ikuta Kazumasa
Nikko Branch, National Research Institute of Aquaculture
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Kitamura Shoji
Nikko Branch, National Research Institute of Aquaculture
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Okuzawa K
National Research Institute Of Aquaculture
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Okuzawa Koichi
National Research Institute Of Aquaculture Fisheries Research Agency
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Ikuta Kazumasa
Nikko Branch National Research Lnstitute Of Aquaculture
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Ikuta Kazumasa
Nikko Branch National Research Institute Of Aquaculture Japan Fisheries Agency
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Yamamori K
School Of Marine Biosciences Kitasato University
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Yamamori Kunio
School Of Fisheries Science Kitasato University
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Ichikawa M
Department Of Applied Biochemistry Utsunomiya University
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Yamada Hideaki
School Of Fisheries Sciences Kitasato University
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Yamamori Kunio
School Of Fisheries Sciences Kitasato University
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Iigo Masayuki
Department Of Biotechnology United Graduate School Of Agricultural Science Tokyo University Of Agric
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