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Masayuki M. Iigo Shoji S. Kitamurai Kazumasa K. Ikuta F. Javier F.J. Sánchez-Vázquezi Ritsuko R. Ohtani-Kanekoi Masayuki M. Hara 《Biological Rhythm Research》2013,44(1):86-97
The pineal organ of masu salmon Oncorhynchus masou was maintained in a flow-through, whole-organ culture (superfusion) system and melatonin secretory profiles were determined at 15 °C under light-dark cycles of 12:12 h (LD 12:12) or the same in combination with constant darkness (DD) for 72 h. Under LD 12:12, superfused pineal organs showed a rhythmic melatonin secretion with high and low rates during the dark phase and the light phase, respectively. When the pineal organs maintained under LD 12:12 for 24 h were transferred to DD, melatonin secretion was consistently activated and no endogenous component was evident. When the pineal organs maintained under DD for 48 h were transferred to LD 12:12, melatonin secretion was reduced only during the light phase. These results indicate that melatonin secretion from the superfused pineal organ of masu salmon is regulated not by an intra-pineal circadian oscillator but by the environmental LD cycles, via local photoreceptors. 相似文献
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Masayuki M. Iigo Shoji S. Kitamurai Kazumasa K. Ikuta F. Javier F. J. S nchez-V zquezi Ritsuko R. Ohtani-Kanekoi Masayuki M. Hara Kazuaki K. Hirata Mitsuo M. Tabata Katsumi K. Aida 《Biological Rhythm Research》1998,29(1):86-97
The pineal organ of masu salmon Oncorhynchus masou was maintained in a flow-through, whole-organ culture (superfusion) system and melatonin secretory profiles were determined at 15 °C under light-dark cycles of 12:12 h (LD 12:12) or the same in combination with constant darkness (DD) for 72 h. Under LD 12:12, superfused pineal organs showed a rhythmic melatonin secretion with high and low rates during the dark phase and the light phase, respectively. When the pineal organs maintained under LD 12:12 for 24 h were transferred to DD, melatonin secretion was consistently activated and no endogenous component was evident. When the pineal organs maintained under DD for 48 h were transferred to LD 12:12, melatonin secretion was reduced only during the light phase. These results indicate that melatonin secretion from the superfused pineal organ of masu salmon is regulated not by an intra-pineal circadian oscillator but by the environmental LD cycles, via local photoreceptors. 相似文献
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