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- W2082123075 abstract "Mice lacking the visual cycle enzymes RPE65 or lecithin-retinol acyl transferase (Lrat) have pupillary light responses (PLR) that are less sensitive than those of mice with outer retinal degeneration (rd/rd or rdta). Inner retinal photoresponses are mediated by melanopsin-expressing, intrinsically photosensitive retinal ganglion cells (ipRGCs), suggesting that the melanopsin-dependent photocycle utilizes RPE65 and Lrat. To test this hypothesis, we generated rpe65(-/-); rdta and lrat(-/-); rd/rd mutant mice. Unexpectedly, both rpe65(-/-); rdta and lrat(-/-); rd/rd mice demonstrate paradoxically increased PLR photosensitivity compared with mice mutant in visual cycle enzymes alone. Acute pharmacologic inhibition of the visual cycle of melanopsin-deficient mice with all-trans-retinylamine results in a near-total loss of PLR sensitivity, whereas treatment of rd/rd mice has no effect, demonstrating that the inner retina does not require the visual cycle. Treatment of rpe65(-/-); rdta with 9-cis-retinal partially restores PLR sensitivity. Photic sensitivity in P8 rpe65(-/-) and lrat(-/-) ipRGCs is intact as measured by ex vivo multielectrode array recording. These results demonstrate that the melanopsin-dependent ipRGC photocycle is independent of the visual retinoid cycle." @default.
- W2082123075 created "2016-06-24" @default.
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- W2082123075 date "2006-07-05" @default.
- W2082123075 modified "2023-09-25" @default.
- W2082123075 title "Inner retinal photoreception independent of the visual retinoid cycle" @default.
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- W2082123075 doi "https://doi.org/10.1073/pnas.0600917103" @default.
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