Cited by 173Retinal Development and DisordersRetinoids in leukemia and cellular processesRetinal Diseases and Treatments

Retinol dehydrogenases (RDHs) in the visual cycle

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Parker, Ryan O., Crouch, Rosalie K.·2010·Experimental Eye Research

Abstract

The isomerization of 11-cis retinal to all-trans retinal in photoreceptors is the first step in vision. For photoreceptors to function in constant light, the all-trans retinal must be converted back to 11-cis retinal via the enzymatic steps of the visual cycle. Within this cycle, all-trans retinal is reduced to all-trans retinol in photoreceptors and transported to the retinal pigment epithelium (RPE). In the RPE, all-trans retinol is converted to 11-cis retinol, and in the final enzymatic step, 11-cis retinol is oxidized to 11-cis retinal. The first and last steps of the classical visual cycle are reduction and oxidation reactions, respectively, that utilize retinol dehydrogenase (RDH) enzymes. The visual cycle RDHs have been extensively studied, but because multiple RDHs are capable of catalyzing each step, the exact RDHs responsible for each reaction remain unknown. Within rods, RDH8 is largely responsible for the reduction of all-trans retinal with possible assistance from RDH12. retSDR1 is thought to reduce all-trans retinal in cones. In the RPE, the oxidation of 11-cis retinol is carried out by RDH5 with possible help from RDH11 and RDH10. Here, we review the characteristics of each RDH in vitro and the findings from knockout models that suggest the roles for each in the visual cycle.

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Crossref · 10.1016/j.exer.2010.08.013

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  • Only RDH5, RDH8, RDH10, RDH11, RDH12, RDH13, RDH14, and retSDR1 have been proven to be expressed in retina or RPE.

    “In fact only RDH5, RDH8, RDH10, RDH11, RDH12, RDH13, RDH14, and retSDR1 were proven to be expressed in the retina or RPE, and their roles have been studied in the context of the visual (retinoid) cycle.68,287”

    From Chemistry of the Retinoid (Visual) Cycle (2014) · cites this paper as [68]

    Sections 2–5 locate the listed RDHs and retSDR1 in the retina or RPE and discuss their possible or studied roles in the visual cycle. Section 5 explicitly says RDH13 and RDH14 are expressed in the retina. The review does not establish the claim’s exclusive “only” or “proven” wording; it also says RDH13 has no known role in the classical visual cycle. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • The RPE expresses key metabolic enzymes needed to produce 11-cis-retinal and is an integral part of the retinoid cycle.

    “the RPE expresses key metabolic enzymes required for production of the visual chromophore, 11-cis-retinal, and thus comprises an integral part of the retinoid cycle.”

    From Chemistry of the Retinoid (Visual) Cycle (2014) · cites this paper as [68]

  • 11-cis-retinal is produced in the RPE and delivered to photoreceptors.

    “The photosensitive active retinoid, 11-cis-retinal, is produced in the RPE and delivered to the photoreceptors.”

    From Chemistry of the Retinoid (Visual) Cycle (2014) · cites this paper as [68]

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Authors
Parker, R. O., & Crouch, R. K.
Affiliations
Medical University of South Carolina (US)
Corresponding author
Parker, Ryan O.
Venue
Experimental Eye Research
Publisher
Elsevier BV
Published
2010-12
Volume
91
Issue
6
Pages
788-792
ISSN
0014-4835 (ISSN-L)
OpenAlex
W2052361452
Cited by
173
References
35
Citations by year
2026: 6 · 2025: 6 · 2024: 8 · 2023: 14 · 2022: 10 · 2021: 11 · 2020: 10 · 2019: 13 · 2018: 12 · 2017: 11 · 2016: 15 · 2015: 10 · 2014: 13 · 2013: 6 · 2012: 17
FWCI
0.95
Type
journal article
Language
en
Open access
Locations
  • Experimental Eye Research (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Research to Prevent Blindness
  • Medical University of South Carolina
  • National Institutes of Health
  • National Eye Institute (EY04939, R24EY014793, EY 14793, R01EY004939)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinoids in leukemia and cellular processes
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
Keywords
retinol dehydrogenase, visual cycle, retinal pigment epithelium, photoreceptors, knockout models
MeSH terms
Animals, Humans, Oxidation-Reduction, Retina, Vision, Ocular, Mice, Knockout, Retinal Dehydrogenase, Mice, Retinal Pigment Epithelium

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