Developmental Changes in Heart Photosensitivity of the Isopod Crustacean Ligia exotica
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概要
- 論文の詳細を見る
During juvenile development, the cardiac pacemaker of the isopod crustacean Ligia exotica is transferred from the myocardium to the cardiac ganglion of the neurogenic heart. In adult, light stimulus decreases the beat frequency of the heart. To elucidate developmental changes in the photosensitivity of the juvenile Ligia heart, we examined the effect of a light stimulus on the semi-isolated heart of juveniles at various developmental stages by the recording membrane potential of the myocardium. We also examined the effect of hyperpolarizing current injection into the myocardium, because this causes different effects on the beat frequency between myogenic and neurogenic hearts. In newly hatched juveniles, beat frequency decreased upon current injection but exhibited no response to white light. In contrast, 10 days after hatching, beat frequency did not change upon current injection, but decreased in response to white light. The heart photoresponse of juveniles was reversibly eliminated by application of tetrodotoxin, which changes the heartbeat from neurogenic to myogenic by suppressing cardiac ganglion activity. The proportion of juveniles exhibiting a heart photoresponse increased gradually up to 100% during the period between 3 and 10 days after hatching. The results suggest that the heart photoresponse of L. exotica appears in association with transfer of the cardiac pacemaker from the myocardium to the cardiac ganglion during juvenile development.
- 社団法人 日本動物学会の論文
著者
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HARIYAMA Takahiko
Laboratory of Biology, Hamamatsu University School of Medicine
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HORIGUCHI Hiroko
Laboratory of Biology, Hamamatsu University School of Medicine
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Hariyama T
Department Of Biology Faculty Of Medicine Hamamatsu University School Of Medicine
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Miyamoto Hiroshi
Graduate School of Life and Environmental Sciences, University of Tsukuba
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Yamagishi Hiroshi
Graduate School of Life and Environmental Sciences, University of Tsukuba
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