Cited by 126Retinal Diseases and TreatmentsOcular Diseases and Behçet’s SyndromeComplement system in diseases

C-reactive protein and complement factor H in aged human eyes and eyes with age-related macular degeneration

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Bhutto, I. A., Baba, T., Merges, C., Juriasinghani, V., McLeod, D. S., Lutty, G. A.·2011·British Journal of Ophthalmology

Abstract

BACKGROUND: There is increasing evidence that inflammation and immune-mediated processes (complement activation) play an important role in age-related macular degeneration (AMD) pathogenesis. A genetic variation in the gene encoding complement factor H (CFH) and plasma levels of C-reactive protein (CRP), a systemic marker of subclinical inflammation, have consistently been shown to be associated with an increased risk for AMD. In the present study, we examined the immunolocalisation of CRP and CFH in aged control human donor eyes (n=10; mean age 79 years) and eyes with AMD (n=18; mean age 83 years). METHODS: Alkaline phosphatase immunohistochemistry was performed using polyclonal antibodies against CRP and CFH on cryopreserved tissue sections from disc/macular blocks. Three independent masked observers scored the reaction product (0-8). RESULTS: In aged control eyes, the retinal pigment epithelium/Bruch's membrane/choriocapillaris (RPE/BrM/CC) complex including intercapillary septa (ICS) had the most prominent immunostaining for CRP and CFH. CRP was significantly higher than controls in BrM/CC/ICS and choroidal stroma in early and wet AMD eyes (p<0.05). In contrast, CFH was significantly lower in BrM/CC/ICS complex of AMD choroids than in controls (p<0.05). Interestingly, CRP and CFH were significantly reduced in BrM/CC/ICS complex in atrophic area of macula in geographical atrophy (p<0.05). Drusen and basal laminar deposits were intensely positive for CRP and CFH. CONCLUSION: These immunohistochemical findings show that changes in distribution and relative levels of CRP and CFH were evident in early and late AMD eyes. This suggests that high levels of CRP and insufficient CFH at the retina/choroid interface may lead to uncontrolled complement activation with associated cell and tissue damage. This study supports the hypothesis that inflammation and immune-mediated mechanisms are involved in the pathogenesis of AMD.

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Authors
Bhutto, I. A., Baba, T., Merges, C., Juriasinghani, V., McLeod, D. S., & Lutty, G. A.
Affiliations
Johns Hopkins University (US)
Corresponding author
Lutty, G. A.
Venue
British Journal of Ophthalmology
Publisher
BMJ
Published
2011-06-01
Volume
95
Issue
9
Pages
1323-1330
ISSN
0007-1161 (ISSN-L)
OpenAlex
W1974343663
Cited by
126
References
34
Citations by year
2026: 3 · 2025: 6 · 2024: 11 · 2023: 4 · 2022: 9 · 2021: 7 · 2020: 8 · 2019: 7 · 2018: 11 · 2017: 8 · 2016: 15 · 2015: 9 · 2014: 13 · 2013: 9 · 2012: 5
FWCI
8.40
Type
journal article
Language
en
Open access
Locations
  • British Journal of Ophthalmology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • Johns Hopkins University
  • National Eye Institute (R01EY016151, #EY01765, P30EY001765)
Topics
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Health Sciences › Medicine › Ophthalmology › Ocular Diseases and Behçet’s Syndrome
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
Keywords
age-related macular degeneration, C-reactive protein, complement factor H, complement activation, retinal inflammation, choroid, Bruch's membrane, choroidal stroma, drusen, retinal pigment epithelium, choriocapillaris, immunolocalization
MeSH terms
Aged, Aged, 80 and over, Aging, C-Reactive Protein, Female, Humans, Immunohistochemistry, Macular Degeneration, Male, Prognosis, Biomarkers, Complement Factor H, Disease Progression, Retinal Pigment Epithelium

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