Mechanisms Controlling Motile Responses of Amelanotic Melanophores in the Medaka, Oryzias latipes(Physiology)

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Using light-colored varieties of the medaka, Oryzias latipes, we have studied the mechanisms by which the aggregation and dispersion of premelanosomes within amelanotic melanophores are controlled. An alpha-adrenergic agonist (norepinephrine), melatonin, melaninconcentrating hormone (MCH), and K ions gave rise to the aggregation of the cellular inclusions, while a beta-agonist (isoxsuprine), adenosine, alpha-melanophore-stimulating hormone (alpha-MSH) and atropine were effective in dispersing them. Acetylcholine was without effects. Pharmacological analyses on the mode of action of these agents indicate that, like other usual motile chromatophores, the amelanotic melanophores are motile, and further that they are regulated in the same way as the chromatophores of common teleosts, comprizing the melanophores of the wild-type specimens of the present species, Oryzias latipes. Implication of the presence of the sound but purposeless controlling system for those colorless chromatophores was discussed.
社団法人日本動物学会の論文
1985-06-15