title: Intra-retinal visual cycle required for rapid and complete cone dark adaptation.
abstract: Daytime vision is mediated by retinal cones, which, unlike rods, remain functional even in bright light and dark-adapt rapidly. These cone properties are enabled by rapid regeneration of their pigment. This in turn requires rapid chromophore recycling that may not be achieved by the canonical retinal pigment epithelium visual cycle. Recent biochemical studies have suggested the presence of a second, cone-specific visual cycle, although its physiological function remains to be established. We found that the Müller cells in the salamander neural retina promote cone-specific pigment regeneration and dark adaptation that are independent of the pigment epithelium. Without this pathway, dark adaptation of cones was slow and incomplete. Notably, the rates of cone pigment regeneration by the retina and pigment epithelium visual cycles were essentially identical, suggesting a possible common rate-limiting step. Finally, we also observed cone dark adaptation in the isolated mouse retina.
authors.affiliation: Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, 660 South Euclid Ave., Saint Louis, Missouri 63110, USA.
authors.forename: Jin-Shan
authors.initials: JS
authors.lastname: Wang
authors.forename: Maureen E
authors.initials: ME
authors.lastname: Estevez
authors.forename: M Carter
authors.initials: MC
authors.lastname: Cornwall
authors.forename: Vladimir J
authors.initials: VJ
authors.lastname: Kefalov
mesh_terms: D000557:Ambystoma; D000818:Animals; D003623:Dark Adaptation / Q000502:physiology*; D004596:Electroretinography / Q000379:methods; D051379:Mice; D008810:Mice, Inbred C57BL; D010775:Photic Stimulation / Q000379:methods; D020419:Photoreceptor Cells, Vertebrate / Q000502:physiology; D012160:Retina / Q000502:physiology; D017949:Retinal Cone Photoreceptor Cells / Q000502:physiology*; D013997:Time Factors; D014562:Caudata; D014796:Visual Perception / Q000502:physiology*