Changes in the Responsiveness of Melanophores to Electrical Nervous Stimulation after Prolonged Background Adaptation in the Medaka, Oryzias latipes

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The effects of prolonged background adaptation on the responses of melanophores were studied using electrical nervous stimulation. Electrical stimulation at various intensities and frequencies and for various periods of time was applied to scales isolated from B and W fish and the responses of melanophores in the scales were recorded photoelectrically. When electrical stimulation at enough intensity to induce maximal melanosome-aggregation response ("maximal stimulus") was applied, there was no significant difference, in terms of the relationship between the magnitude of the aggregation response and the frequency or period of stimulation , between melanophores of B and W fish. However, the minimum effective voltage necessary to provoke the discernible aggregation of melanosomes in B fish was lower than that in W fish. With application of stimulation at intensities less than intensity of maximal stimulus, the response of melanophores in B fish was greater than that in W fish. These results suggest that prolonged background adaptation may induce changes in the excitability or in the density of distribution of chromatic nerve fibers, with a resultant change in the concentration of released norepinephrine , upon electrical stimulation.
社団法人日本動物学会の論文
1994-02-15