Cited by 104Retinal Diseases and TreatmentsRetinal Development and DisordersComplement system in diseases

Retinal pigment epithelial expression of complement regulator CD46 is altered early in the course of geographic atrophy

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Vogt, Susan D., Curcio, Christine A., Wang, Lan, Li, Chuan-Ming, McGwin, Gerald, Medeiros, Nancy E., Philp, Nancy J., Kimble, James A. +1 more·2011·Experimental Eye Research

Abstract

In geographic atrophy (GA), the non-neovascular end stage of age-related macular degeneration (AMD), the macular retinal pigment epithelium (RPE) progressively degenerates. Membrane cofactor protein (MCP, CD46) is the only membrane-bound regulator of complement expressed on the human RPE basolateral surface. Based on evidence of the role of complement in AMD, we hypothesized that altered CD46 expression on the RPE would be associated with GA development and/or progression. Here we report the timeline of CD46 protein expression changes across the GA transition zone, relative to control eyes, and relative to events in other chorioretinal layers. Eleven donor eyes (mean age 87.0 ± 4.1 yr) with GA and 5 control eyes (mean age 84.0 ± 8.9 yr) without GA were evaluated. Macular cryosections were stained with PASH for basal deposits, von Kossa for calcium, and for CD46 immunoreactivity. Internal controls for protein expression were provided by an independent basolateral protein, monocarboxylate transporter 3 (MCT3) and an apical protein, ezrin. Within zones defined by 8 different semi-quantitative grades of RPE morphology, we determined the location and intensity of immunoreactivity, outer segment length, and Bruch's membrane calcification. Differences between GA and control eyes and between milder and more severe RPE stages in GA eyes were assessed statistically. Increasing grades of RPE degeneration were associated with progressive loss of polarity and loss of intensity of staining of CD46, beginning with the stages that are considered normal aging (grades 0-1). Those GA stages with affected CD46 immunoreactivity exhibited basal laminar deposit, still-normal photoreceptors, and concomitant changes in control protein expression. Activated or anteriorly migrated RPE (grades 2-3) exhibited greatly diminished CD46. Changes in RPE CD46 expression thus occur early in GA, before there is evidence of morphological RPE change. At later stages of degeneration, CD46 alterations occur within a context of altered RPE polarity. These changes precede degeneration of the overlying retina and suggest that therapeutic interventions be targeted to the RPE.

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Crossref · 10.1016/j.exer.2011.06.002

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  1. Brar M Kozak I Cheng L Bartsch DU Yuson R Nigam N Oster SF Mojana F Freeman WR Correlation between spectral-domain optical coherence tomography and fundus autofluorescence at the margins of geographic atrophy American Journal of Ophthalmology 2009b 148 439 444 19541290 PMC2731819
  2. Spraul CW Grossniklaus HE Characteristics of drusen and Bruch's membrane in postmortem eyes with age-related macular degeneration Arch. Ophthalmol 1997b 115 267 273 9046265
  3. van der Schaft TL Mooy CM de Bruijn WC Oron FG Mulder PGH de Jong PTVM Histologic features of the early stages of age-related macular degeneration Ophthalmol 1992b 99 278 286 1553220

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Authors
Vogt, S. D., Curcio, C. A., Wang, L., Li, C.-M., McGwin, G., Medeiros, N. E., Philp, N. J., Kimble, J. A., & Read, R. W.
Affiliations
  • University of Alabama at Birmingham (US)
  • Thomas Jefferson University (US)
Corresponding author
Read, Russell W.
Venue
Experimental Eye Research
Publisher
Elsevier BV
Published
2011-10
Volume
93
Issue
4
Pages
413-423
ISSN
0014-4835 (ISSN-L)
OpenAlex
W2080778821
Cited by
104
References
81
Citations by year
2026: 4 · 2025: 6 · 2024: 6 · 2023: 6 · 2022: 6 · 2021: 8 · 2020: 6 · 2019: 5 · 2018: 4 · 2017: 7 · 2016: 9 · 2015: 8 · 2014: 12 · 2013: 6 · 2012: 11
FWCI
9.00
Type
journal article
Language
en
Open access
Locations
  • Experimental Eye Research (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Eye Institute (EY012042, R01EY012042, R56EY012042, R01EY006109, EY06109)
Topics
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
Keywords
geographic atrophy, retinal pigment epithelium, CD46, membrane cofactor protein, complement regulation, age-related macular degeneration, RPE degeneration, basal laminar deposits, photoreceptor outer segment length, ezrin
MeSH terms
Aged, Aged, 80 and over, Female, Humans, Immunoenzyme Techniques, Male, Tissue Donors, Monocarboxylic Acid Transporters, Symporters, Membrane Cofactor Protein, Retinal Pigment Epithelium, Geographic Atrophy

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