Daily and Circadian Variations of the Pineal and Ocular Melatonin Contents and their Contributions to the Circulating Melatonin in the Japanese Newt, Cynops pyrrhogaster(Endocrinology)
スポンサーリンク
概要
- 論文の詳細を見る
Daily and circadian variations of melatonin contents in the diencephalic region containing the pineal organ, the lateral eyes, and plasma were studied in a urodele amphibian, the Japanese newt (Cynops pyrrhogaster), to investigate the possible roles of melatonin in the circadian system. Melatonin levels in the pineal region and lateral eyes exhibited daily variations with higher levels during the dark phase than during the light phase under a light-dark cycle of 12 h light and 12 h darkness (LD12:12). These rhythms persisted even under constant darkness but the phase of the rhythm was different from each other. Melatonin levels in the plasma also exhibited significant day-night changes with higher values at mid-dark than at mid-light under LD 12:12. The day-night changes in plasma melatonin levels were abolished in the pinealectomized (Px), ophthalmectomized (Ex), and Px+Ex newts but not in the sham-operated newts. These results indicate that in the Japanese newts, melatonin production in the pineal organ and the lateral eyes were regulated by both environmental light-dark cycles and endogenous circadian clocks, probably located in the pineal organ and the retina, respectively, and that both the pineal organ and the lateral eyes are required to maintain the daily variations of circulating melatonin levels.
- 2005-01-25
著者
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IIGO Masayuki
Department of Applied Biochemical Science, Faculty of Agriculture, Utsunomiya University
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HATTORI Atsuhiko
Department of Biology, College of Liberal Arts and Sciences, Tokyo Medical and Dental University
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Iigo M
Department Of Applied Biochemistry Faculty Of Agriculture Utsunomiya University
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Hattori A
Tokyo Medical And Dental Univ. Chiba Jpn
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Hattori Atsuhiko
College Of Liberal Arts And Sciences Tokyo Medical And Dental 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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CHIBA Atsuhiko
Life Sciemce Institute, Sophia University
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Chiba Atsuhiko
Life Science Institute Sophia University
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Chiba Atsuhiko
Life Sciemce Institute Sophia University
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Hattori Atsuhiko
Tokyo Medical And Dental Univ. Chiba Jpn
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Ichikawa M
Department Of Applied Biochemistry Utsunomiya University
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Iigo Masayuki
Department Of Biotechnology United Graduate School Of Agricultural Science Tokyo University Of Agric
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