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• W69852060 abstract "The morphology and spatial distribution of dopaminergic (DA-) cells were studied by the histofluorescence technique with cryo-sectioned and flat-mounted retinas of the teleosts (Mugil cephalus and Cyprinus carpio). DA-cells, belonging to a class of interplexiform cells, were found sparsely among amacrine cells at the innermost row of the inner nuclear layer. The processes arising from DA-cells extend towards both the outer and inner plexiform layers (IPL), forming fiber networks around horizontal cells and in the IPL, respectively. DA-cells were found to be distributed in a mixed fashion with indoleamine-accumulating (IA-) cells over the whole retinal area, and their densities (cells/mm2) were higher in the peripheral than central retina. The size of both classes of cells was smaller the higher their densities. Those cells located in the intermediate and peripheral regions appeared to be arranged in radial rows, originating at the optic disc and fanning out towards the retinal margin. The density ratios of DA-cells to IA-cells and to other cells located in the amacrine cell layer were found to be 1:1 and 1:354, respectively. Following pretreatment of the eyes with intravitreal 6-hydroxydopamine or 5,7-dihydroxytryptamine, DA-cells or IA-cells could be selectively eliminated from the retina. As a part of our search for the possible role of the retinal dopaminergic system, effects of DA were investigated on the intracellularly recorded membrane potential of horizontal cells in the isolated and superfused retina (Eugerres plumieri). DA (0.2 mM) depolarized horizontal cells while markedly increasing the center response to spot and decreasing the surround response to annular illumination. The results indicate that DA modulates the spatial property of the horizontal cell activity. Since the effects of DA observed are assumed to simulate a functional aspect of interplexiform DA-cells, the latter may play an important role in the lateral inhibition taking place at the horizontal cell level in the fish retina." @default.
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• W69852060 date "1982-01-01" @default.
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• W69852060 title "Dopaminergic Cells and their Possible Role in the Fish Retina" @default.
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• W69852060 doi "https://doi.org/10.1016/b978-0-08-027391-4.50033-2" @default.
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