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• W2087361927 abstract "Retinal horizontal cells exhibit large receptive fields derived from their extensive electrical coupling by means of gap junctions. The conductance of these gap junctions seems to be regulated by dopamine acting through a cAMP-mediated cascade. There is now abundant evidence that extracellular dopamine levels vary with changes in ambient light intensity, suggesting that changes in the dark/light adaptational state of the retina can modulate coupling between horizontal cells. We studied this question in the mammalian retina by determining the effects of ambient light levels, in the form of changing background light intensity, on the coupling profiles of A- and B-type horizontal cells in the rabbit. Changes in coupling were assessed by measurements of the space constants of the syncytium formed by horizontal cells and the intercellular spread of the biotinylated tracer Neurobiotin. Our results indicate that dark-adapted horizontal cells show relatively weak coupling. However, presentation of background lights as dim as one-quarter log unit above rod threshold resulted in increases in both the averaged extent of tracer coupling and space constants of A- and B-type horizontal cells. Coupling expanded further as background light intensities were increased by 1–1.5 log units, after which additional light adaptation brought about an uncoupling of cells. Coupling reached its minimum at light intensities about 3 log units above rod threshold, after which, with further light adaptation, it stabilized at levels close to those seen in dark-adapted retinas. Our results indicate that electrical coupling between mammalian horizontal cells is modulated dramatically by changes in the adaptational state of the retina: coupling is maximized under dim ambient light conditions and diminishes as the retina is dark or light adapted from this level. J. Comp. Neurol. 405:75–87, 1999. © 1999 Wiley-Liss, Inc." @default.
• W2087361927 created "2016-06-24" @default.
• W2087361927 creator A5051500568 @default.
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• W2087361927 date "1999-03-01" @default.
• W2087361927 modified "2023-10-12" @default.
• W2087361927 title "Dark- and light-induced changes in coupling between horizontal cells in mammalian retina" @default.
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• W2087361927 doi "https://doi.org/10.1002/(sici)1096-9861(19990301)405:1<75::aid-cne6>3.0.co;2-d" @default.
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