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Effect of calcium antagonists on light response of cultured melanophores of Oryzias latipes

Effect of calcium antagonists on light response of cultured melanophores of Oryzias latipes

Journal of Experimental Zoology, 2402: 183-189

Dispersion of melanosomes in Oryzias melanophores, induced by illumination, was completely inhibited by the Ca2+ antagonists lanthanum (0.2 mM), verapamil (0.3 mM), and papaverine (0.3 mM), but only slightly inhibited by ruthenium red (4 mM). The inhibitory effect of lanthanum or verapamil depended on the extracellular concentration of calcium ions, suggesting the competition between binding of Ca2+ and binding of lanthanum or verapamil. Theophylline induced full dispersion of melanosomes, even in the presence of the Ca2+ antagonists. This fact suggests that Ca2+ is not specifically required for the dispersion of melanosomes per se but, rather, that calcium ions are required for the transduction of light stimulation into cytoplasm. The Ca2+ antagonists affected neither the dark-induced aggregation of melanosomes nor the aggregation induced by melanophore concentrating hormone.

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Accession: 017870946

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