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At least 451 records · Page 25Linked to original sources
PubMed1985

Receptor mechanisms in fish chromatophores--VII. Muscarinic cholinoceptors and alpha adrenoceptors, both mediating pigment aggregation, strangely coexist in Corydoras melanophores.

Both acetylcholine and catecholamines showed melanin-aggregating action within melanophores on an isolated bony plate of the mailed catfish Corydoras paleatus. Chromatic nervous stimulation either by an electrical field or by an elevation of [K+]0 brought about melanosome aggregation. Alpha adrenolytic agents antagonized the melanin-aggregating effects either of catecholamines or of nervous stimuli. Muscarinic cholinolytics interfered with the action of acetylcholine, but did not have any effect on the responses to nervous stimuli. In addition to the alpha adrenoceptors which participate in sympathetic-melanophore transmission, muscarinic cholinoceptors of unknown functional significance, which also mediate melanosome aggregation in the cell, exist in Corydoras melanophores.

Acetylcholine↗
PubMed1986

Control of chromatophore movements in dermal chromatic units of blue damselfish--II. The motile iridophore.

The mechanism regulating the movements of the unique motile iridophores of the blue damselfish, Chyrsiptera cyanea, was studied. The reaction in which the cells become reflective to light rays of longer wavelength, i.e. from the near u.v. region to the green region, was designated as the "coloring response", while the reverse process was labeled the "clearing response". Both nervous stimuli and adrenergic agonists gave rise to the coloring response, which could be antagonized by alpha adrenolytic agents. The clearing response was accelerated by adenosine and inhibited by theophylline. None of the hormonal substances tested had any effect on the motile response of the cells. It was concluded that the motile iridophores are solely under the control of the sympathetic adrenergic system, and that the co-transmitter, adenosine, may function to antagonize quickly the true transmitter-induced colored state of the cells.

Adenosine↗