Pattern of Adrenergic Innervation to Scale Erythrophores of the Swordtail, Xiphophorus helleri(Physiology)

概要

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The pattern of innervation to erythrophores and melanophores in reddish scales of the swordtail, Xiphophorus helleri ('neon' and 'tuxedo' strains), was determined using ^3H-norepinephrine (^3H-NE) by light microscopic autoradiography. When isolated scales of 'neon' fish were incubated in ^3H-NE, autoradiograms revealed that dense plexuses of varicose fibers labeled with ^3H-NE enclosed the dendrites and cell bodies of melanophores, but no exact plexus that corresponds to erythrophores could be observed. In 'tuxedo' scales, in which only erythrophores exist, a fairly dense varicose plexus was seen to enclose each erythrophore. These labeled fibers were never observed in scales incubated in the presence of excess cold NE or in denervated ones. Potassium ions induced a marked decrease in the labeling of varicose fibers in addition to the aggregation of pigment granules within both chromatophores. These findings suggest that the observed labeled fibers are adrenergic nerves which control the pigment-aggregation response of chromatophores and further that erythrophores and melanophores of the present fish receive the same adrenergic innervation.
社団法人日本動物学会の論文
1985-02-15