Cited by 44Retinal Diseases and TreatmentsComplement system in diseasesRetinal Development and Disorders

Bisretinoid-mediated complement activation on retinal pigment epithelial cells is dependent on complement factor H haplotype

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Radu, Roxana A., Hu, Jane, Jiang, Zhichun, Bok, Dean·2014·Journal of Biological Chemistry

Abstract

Age-related macular degeneration (AMD) is a common central blinding disease of the elderly. Homozygosity for a sequence variant causing Y402H and I62V substitutions in the gene for complement factor H (CFH) is strongly associated with risk of AMD. CFH, secreted by many cell types, including those of the retinal pigment epithelium (RPE), is a regulatory protein that inhibits complement activation. Recessive Stargardt maculopathy is another central blinding disease caused by mutations in the gene for ABCA4, a transporter in photoreceptor outer segments (OS) that clears retinaldehyde and prevents formation of toxic bisretinoids. Photoreceptors daily shed their distal OS, which are phagocytosed by the RPE cells. Here, we investigated the relationship between the CFH haplotype of human RPE (hRPE) cells, exposure to OS containing bisretinoids, and complement activation. We show that hRPE cells of the AMD-predisposing CFH haplotype (HH402/VV62) are attacked by complement following exposure to bisretinoid-containing Abca4(-/-) OS. This activation was dependent on factor B, indicating involvement of the alternative pathway. In contrast, hRPE cells of the AMD-protective CFH haplotype (YY402/II62) showed no complement activation following exposure to either Abca4(-/-) or wild-type OS. The AMD-protective YY402/II62 hRPE cells were more resistant to the membrane attack complex, whereas HH402/VV62 hRPE cells showed significant membrane attack complex deposition following ingestion of Abca4(-/-) OS. These results suggest that bisretinoid accumulation in hRPE cells stimulates activation and dysregulation of complement. Cells with an intact complement negative regulatory system are protected from complement attack, whereas cells with reduced CFH synthesis because of the Y402H and I62V substitutions are vulnerable to disease.

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  • Human fetal RPE cultures carrying a complement factor H risk haplotype have increased susceptibility to oxidative stress and complement attack when fed OSs from Abca4−/− mice.

    “Human fetal RPE cultures carrying a complement factor H risk haplotype were found to have an increased susceptibility to oxidative stress and complement attack when fed OSs from Abca4−/− mice (Radu et al., 2011, 2014)”

    From The cell biology of the retinal pigment epithelium (2020) · cites this paper as Radu et al., 2014

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Authors
Radu, R. A., Hu, J., Jiang, Z., & Bok, D.
Affiliations
University of California, Los Angeles (US)
Corresponding author
Radu, Roxana A.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2014-03
Volume
289
Issue
13
Pages
9113-9120
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2107997598
Cited by
44
References
50
Citations by year
2025: 3 · 2024: 3 · 2022: 3 · 2021: 2 · 2020: 6 · 2019: 3 · 2018: 6 · 2017: 4 · 2016: 3 · 2015: 5 · 2014: 6
FWCI
5.62
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • Macula Vision Research Foundation
  • University of California, Santa Barbara
  • National Eye Institute (EY-000331, P30EY000331)
Topics
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
Keywords
complement activation, complement factor H, bisretinoids, retinal pigment epithelium, age-related macular degeneration, ABCA4, photoreceptor outer segments, alternative complement pathway, factor B, membrane attack complex, complement regulation
MeSH terms
Animals, Cell Membrane, Complement C3b, Haplotypes, Humans, Macular Degeneration, Retinoids, Complement Factor H, ATP-Binding Cassette Transporters, Genetic Predisposition to Disease, Mice, Retinal Pigment Epithelium, Retinal Photoreceptor Cell Outer Segment

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