Defective complement control of factor H (Y402H) and FHL-1 in age-related macular degeneration.

Abstract:

:The common variant in the human complement Factor H gene (CFH), with Tyr402His, is linked to age-related macular degeneration (AMD), a prevalent disorder leading to visual impairment and irreversible blindness in elderly patients. Here we show that the risk variant CFH 402His displays reduced binding to C reactive protein (CRP), heparin and retinal pigment epithelial cells. This reduced binding can cause inefficient complement regulation at the cell surface, particularly when CRP is recruited to injured sites and tissue. In addition, we identify the Factor H-like protein 1 (FHL-1), an alternative splice product of the CFH gene as an additional protein that includes the risk residue 402, and thus confers risk for AMD. FHL-1 is expressed in the eye and the FHL-1 402His risk variant shows similar reduced cell binding and likely reduced complement regulatory functions on the cell surface. CFH and FHL-1 may act in concert in the eye and the reduced surface binding may result in inappropriate local complement control, which in turn can lead to inflammation, disturbance of local physiological homeostasis and progression to cell damage. As a consequence, these processes may lead to AMD pathogenesis.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Skerka C,Lauer N,Weinberger AA,Keilhauer CN,Sühnel J,Smith R,Schlötzer-Schrehardt U,Fritsche L,Heinen S,Hartmann A,Weber BH,Zipfel PF

doi

10.1016/j.molimm.2007.02.012

subject

Has Abstract

pub_date

2007-07-01 00:00:00

pages

3398-406

issue

13

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(07)00085-5

journal_volume

44

pub_type

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