Effects of Potassium Ions on Motile Iridophores of Blue Damselfish(Physiology)

概要

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Mechanism of action of K^+ on damsel fish motile iridophores, whose motility has lately been shown to be of an entirely new type was studied. The ion brought the cells to become reflective to longer wave-length light-rays, i.e., from near ultraviolet up to green region. The so-called "coloring response" was blocked by alpha adrenolytic agents. Denervation of the cells or the withdrawal of Ca^<2+> from bathing media brought the cells unresponsive to K^+. Even in Ca^<2+>-free, K^+-rich media, neither catecholamines nor adenosine lost their actions. The conclusion was that K^+ acts on presynaptic membrane of the nerves controlling the cells to bring about Ca^<2+> inflow into the cytoplasm, which triggers the liberation of both the adrenergic true transmitter, norepinephrine, and the cotransmitter, adenosine. It was further shown that the effector motility may not be directly dependent on the electrical events at the effector cell membrane.
社団法人日本動物学会の論文
1985-08-15