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• W2087797773 abstract "Exposure of albino rats to continuous light of low intensity (350–700 lux) for 4 months produces massive degeneration of the photoreceptor segments and cell bodies of the outer nuclear layer of the retina. Only a few heterochromatic, receptor cell nuclei remain, and no photoreceptor segments are present. On the other hand, the inner layers of these retinas remain morphologically intact. The inner nuclear layer of the normal rat retina contains a group of amacrine cells which contain the putative neurotransmitter, dopamine (DA). Short term exposure to light (30 or 60 min) markedly stimulates the rate of DA turnover in these cells in normal, previously dark-adapted rats. Such enhancement of the rate of neurotransmitter turnover in the brain has been correlated with an increase in nerve impulse activity. The present study was undertaken to determine if the dopaminergic amacrine cells of the inner nuclear layer were still responsive to light in the retinas of rats whose photoreceptors were previously destroyed by long term exposure to continuous illumination. One week before sacrifice, the animals which had been housed in continuous light for 4 months were returned to normal 14 hr light: 10 hr dark lighting conditions. At the end of this time they and a group of control rats which had been housed in cyclic lighting conditions for the entire 4 months were dark adapted for approximately 15 hr. Then the rate of retinal DA turnover was estimated from the depletion of DA following inhibition of DA synthesis by α methyl para-tyrosine. The turnover of DA in the dark-adapted retinas of the control rats and of experimental rats with photoreceptor degeneration was dramatically enhanced 2–4 fold by short term exposure (up to 1 hr) to light. Since rats are nocturnal and avoid light, we tested the light aversion of another group of rats which had been exposed to light for 4 months and then returned to cyclic lighting conditions for one week. These rats and control animals which had been maintained in cyclic lighting conditions for 4 months both chose the dark side of a light-dark box over 80% of the time. This behavior of the rats with retinal degeneration was taken as a crude indication of their continued ability to detect light. The light-induced increase in DA activity in retinas with photoreceptor degeneration may play a role in the continued ability of these rats to perceive light." @default.
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• W2087797773 title "Dopaminergic amacrine neurons of rat retinas with photoreceptor degeneration continue to respond to light" @default.
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• W2087797773 doi "https://doi.org/10.1016/0024-3205(80)90365-3" @default.
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