An Increase in Extracellular Ca^<2+> Concentration Induces Pigment Aggregation in Teleostean Melanophores(Physiology)
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概要
- 論文の詳細を見る
An increase in the concentration of Ca^<2+> ions in the external medium ([Ca^<2+>]_o) induced pigment aggregation in melanophores of three species of freshwater teleosts examined. Denervated melanophores were refractory to elevations of [Ca^<2+>]_o. The pigment-aggregating action was inhibited by the sympathetic blocking agents, phentolamine, prazosin and yohimbine. Bretylium, an agent known to block the release of the neurotransmitter, interfered with the response effectively. Ca^<2+> blockers, such as Mn^<2+>, verapamil and gallopamil, also inhibited the response, possibly by inhibiting Ca^<2+> entry into the presynaptic elements of melanosome-aggregating fibers. The conclusion is that the increase in [Ca^<2+>]_o may induce membrane depolarization of presynaptic nervous elements around the melanophores, which open the voltage-dependent Ca^<2+> channels there. The liberation of adrenergic neurotransmitter follows, which induces the aggregation of pigment in melanophores.
- 社団法人日本動物学会の論文
- 2002-08-25
著者
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Yamada Takashi
Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima Uni
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Fujii Ryozo
Department of Biomolecular Science, Faculty of Science, Toho University
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Fujii Ryozo
Department Of Biology Faculty Of Science Toho University
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Yamada Takashi
Department Of Animal Science Graduate School Of Agricultural Science Kobe University
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Yamada Takashi
Department Of Biomolecular Science Faculty Of Science Toho University:(present Address)diagnostics Research Laboratories Fujirebio Inc.
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