Cited by 80Retinal Development and DisordersRetinal Diseases and TreatmentsRetinoids in leukemia and cellular processes

RPE65 Gene Delivery Restores Isomerohydrolase Activity and Prevents Early Cone Loss in Rpe65−/−Mice

Chen, Ying, Moiseyev, Gennadiy, Takahashi, Yusuke, Ma, Jian-xing·2006·Investigative Opthalmology & Visual Science

Abstract

PURPOSE: Recent in vitro evidence has shown that RPE65 is the isomerohydrolase that converts all-trans retinyl ester to 11-cis retinal, the chromophore for visual pigments in vertebrates. Homozygous RPE65 knockout (Rpe65-/-) mice lack 11-cis retinoids and have early cone degeneration. The purpose of this study is to determine whether RPE65 gene delivery restores the isomerohydrolase activity and normal profile of endogenous retinoids in Rpe65-/- mice. METHODS: Adenovirus-expressing RPE65 (Ad-RPE65) was injected into the subretinal space of Rpe65-/- mice. The expression of RPE65 was determined by immunohistochemistry and Western blot analysis. The isomerohydrolase activity was measured in vitro in eyecup homogenates. Endogenous retinoid profile in the eyecups was analyzed by high-performance liquid chromatography (HPLC). Photoreceptor-specific gene expression was determined with real-time RT-PCR. Cone degeneration was determined by cone-specific staining and counting cones in flatmounted retina. RESULTS: High levels of RPE65 expression from the Ad-RPE65 injection generated robust isomerohydrolase activity in the eyecup of Rpe65-/- mice, at levels comparable to those in wild-type (wt) mice. Consequently, the RPE65 gene delivery resulted in substantial amounts of 11-cis retinal in Rpe65-/- mice. The RPE65 gene delivery prevented the downregulation of cone-specific genes, including both cone opsins and cone tranducin alpha subunit in Rpe65-/- mice. Moreover, the Ad-RPE65 injection also prevented massive cone degeneration at early ages of Rpe65-/- mice. CONCLUSIONS: RPE65 gene delivery generates isomerohydrolase activity and restores retinoid profile in Rpe65-/- mice. Regeneration of 11-cis retinal is essential for survival of cone photoreceptors.

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Crossref · 10.1167/iovs.05-0965

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Authors
Chen, Y., Moiseyev, G., Takahashi, Y., & Ma, J.-X.
Affiliations
University of Oklahoma Health Sciences Center (US)
Venue
Investigative Opthalmology & Visual Science
Published
2006-03-01
Volume
47
Issue
3
Pages
1177
ISSN
  • 0146-0404 (ISSN-L)
  • 1552-5783
OpenAlex
W1968853259
Cited by
80
References
30
Citations by year
2026: 2 · 2025: 2 · 2024: 1 · 2022: 2 · 2021: 1 · 2020: 3 · 2019: 2 · 2018: 3 · 2017: 1 · 2016: 1 · 2015: 5 · 2014: 11 · 2013: 5 · 2012: 4
Type
conference abstract
Language
en
Open access
closed
Locations
  • Investigative Ophthalmology & Visual Science (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Eye Institute (EY-012231, EY 015650, R01EY012231)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinoids in leukemia and cellular processes
Keywords
RPE65, 11-cis-retinal, vitamin A metabolism, cone photoreceptor degeneration, gene therapy, adenoviral vector, cone opsin, transducin alpha subunit, subretinal injection, retinal regeneration
MeSH terms
Retinoid Isomerohydrolase, Adenoviridae, Animals, Carrier Proteins, Chromatography, High Pressure Liquid, Dark Adaptation, Eye Proteins, Humans, Mice, Inbred C57BL, Retinal Degeneration, Retinaldehyde, Vitamin A, Blotting, Western, Transducin, Genetic Therapy, Gene Expression, Gene Expression Regulation, Enzymologic, Rod Opsins, Retinal Cone Photoreceptor Cells, Mice, Knockout, Fluorescent Antibody Technique, Indirect, cis-trans-Isomerases, Reverse Transcriptase Polymerase Chain Reaction, Mice

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