The role of presynaptic metabotropic glutamate receptor (mGluR) on the interaction of red- and green-cone signals was investigated in luminosity-type horizontal cell (LHC) of isolated carp retina. It was found that a dim red background could enhance LHC’s light response to green stimulus, and a dim green background was also able to increase the cell’s response to red flash. Such mutual color enhancement was eliminated by application of groups II and III mGluR antagonist ( S )-methyl-4-carboxyphenyl-glycine (MCPG). Furthermore, inhibition of glutamate uptake by using d -aspartate ( d -Asp) or dl- threo-β-hydroxy-aspartic acid (THA) completely blocked the mutual enhancement of color signals in LHC. However, the GABAergic feedback pathway in the outer retina was unnecessarily involved.
Brain Research Bulletin – Elsevier
Published: Apr 15, 2003
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