Innervation and Responsiveness of Melanophores in Regenerating Scales of the Medaka, Oryzias latipes(Physiology)
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Changes in the innervation pattern and responsiveness of melanophores to melanosome-aggregating agents were investigated during scale regeneration of the medaka, Oryzias latipes, using the zinc iodide-osmium staining method and autoradiography with [^3H]norepinephrine. During the initial period of scale regeneration (about 5 days), granular melanophores appeared in the scales without nerve supply. On the 7th day, melanophores in the regenerated scales acquired a poorly dendritic form and were innervated with one or two nerve fibers. They responded to norepinephrine with a full aggregation of their pigment, while the degree of their response to K^+ was slight and transient. On. the 21st day, melanophores assumed a nearly normal figure with numerous but slender dendrites, being innervated with sparse networks of nerve fibers, whose response to K^+ increased considerably in level but not completely. On the 42nd day, the nerve fibers ramified to form fine networks over corresponding well-developed melanophores which responded to K^+ with a full aggregation of pigment. Autoradiographs revealed that the density of labeling which corresponded to [^3H]norepinephrine on nerve fibers increased with progress in scale regeneration. These findings imply that the lower degrees in response of melanophores to K^+ to the early stages of scale regeneration are due to an insufficiency in the net amount of neurotransmitter stored and released by each nerve fiber and also to the sparse distribution of nerve fibers to individual melanophores.
- 社団法人日本動物学会の論文
- 1985-04-15
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関連論文
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- Innervation and Responsiveness of Melanophores in Regenerating Scales of the Medaka, Oryzias latipes(Physiology)