Cited by 122Complement system in diseasesRetinal Diseases and TreatmentsOcular Diseases and Behçet’s Syndrome

Identification of factor H-like protein 1 as the predominant complement regulator in Bruch’s membrane: Implications for age-related macular degeneration

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Clark, Simon J, Schmidt, Christoph Q, White, Anne M, Hakobyan, Svetlana, Morgan, B Paul, Bishop, Paul N·2014·The Journal of Immunology

Abstract

The tight regulation of innate immunity on extracellular matrix (ECM) is a vital part of immune homeostasis throughout the human body, and disruption to this regulation in the eye is thought to contribute directly to the progression of age-related macular degeneration (AMD). The plasma complement regulator factor H (FH) is thought to be the main regulator that protects ECM against damaging complement activation. However, in the present study we demonstrate that a truncated form of FH, called FH-like protein 1 (FHL-1), is the main regulatory protein in the layer of ECM under human retina, called Bruch’s membrane. Bruch’s membrane is a major site of AMD disease pathogenesis and where drusen, the hallmark lesions of AMD, form. We show that FHL-1 can passively diffuse through Bruch’s membrane, whereas the full sized, glycosylated, FH cannot. FHL-1 is largely bound to Bruch’s membrane through interactions with heparan sulfate, and we show that the common Y402H polymorphism in the CFH gene, associated with an increased risk of AMD, reduces the binding of FHL-1 to this heparan sulfate. We also show that FHL-1 is retained in drusen whereas FH coats the periphery of the lesions, perhaps inhibiting their clearance. Our results identify a novel mechanism of complement regulation in the human eye, which highlights potential new avenues for therapeutic strategies.

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Authors
Clark, S. J., Schmidt, C. Q., White, A. M., Hakobyan, S., Morgan, B. P., & Bishop, P. N.
Affiliations
  • Manchester Academic Health Science Centre (GB)
  • Universität Ulm (DE)
  • Centre for Hearing and Vision Research, Institute of Human Development, University of Manchester , Manchester M13 9PT ,
  • Cardiff University (GB)
Corresponding author
Clark, Simon J
Venue
The Journal of Immunology
Published
2014-11
Volume
193
Issue
10
Pages
4962-4970
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W1871202872
Cited by
122
References
59
Citations by year
2026: 13 · 2025: 6 · 2024: 8 · 2023: 8 · 2022: 10 · 2021: 13 · 2020: 13 · 2019: 5 · 2018: 12 · 2017: 10 · 2016: 10 · 2015: 13 · 2014: 1
FWCI
5.14
Type
journal article
Language
en
Open access
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
  • Research Explorer (The University of Manchester) (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • ORCA Online Research @Cardiff (Cardiff University) (submittedVersion)
Funders
  • Wellcome Trust
  • University of Manchester
  • Directorate for Biological Sciences
  • Medical Research Council (MR/K004441/1, K004441, MR/K024418/1)
  • Biotechnology and Biological Sciences Research Council
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Health Sciences › Medicine › Ophthalmology › Ocular Diseases and Behçet’s Syndrome
Keywords
factor H-like protein 1, complement factor H, complement regulation, Bruch's membrane, age-related macular degeneration, drusen, heparan sulfate, CFH Y402H polymorphism, extracellular matrix, complement activation
MeSH terms
Complement Activation, Complement C3b Inactivator Proteins, Extracellular Matrix, Gene Expression Regulation, Glycosylation, Heparan Sulfate, Homeostasis, Humans, Immunity, Innate, Macular Degeneration, Protein Binding, Retina, Signal Transduction, Retinal Drusen, Bruch Membrane, Complement Factor H, Protein Transport

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