Proteinase 3 gene polymorphisms and Wegener's granulomatosis.

Abstract:

BACKGROUND:Wegener's granulomatosis (WG) is a rare systemic autoimmune disease characterized by small-vessel vasculitis leading to organ damage and the presence of antineutrophil cytoplasmic autoantibodies (ANCAs). ANCAs were shown to be involved in the pathogenesis of the disease by increasing adhesion of polymorphonuclear cells (PMNs) to endothelial cells and through activation of primed PMN. The main autoantigen of ANCA in WG is proteinase 3 (PR3), a neutrophil- and monocyte-derived neutral serine protease. The association of WG with individuals continuously expressing a high level of PR3 on the surface of PMNs suggests that PR3 variants or altered regulation of PR3 expression might be directly involved in the pathogenesis of the disease. METHODS:We screened the entire coding and promoter sequences of the PR3 gene for polymorphisms by means of polymerase chain reaction single-strand conformation polymorphism (PCR-SSCP). Allelic, genotypic, and haplotype frequencies were compared between 79 WG patients and a cohort of 129 healthy controls. RESULTS:Seven single-nucleotide polymorphisms (SNPs), one amino acid change (Val119Ile), one 84 bp insertion/deletion, and a microsatellite were identified. An association with WG could be demonstrated for the A-564G polymorphism in the PR3 promoter affecting a putative transcription factor-binding site. CONCLUSIONS:This study excludes certain PR3 epitope variants as autoantigenic stimuli in WG, since the Val119Ile polymorphism showed no differences between patients and controls. Overexpression of PR3, however, might predispose the patient to the development of autoimmune ANCA-associated vasculitis.

journal_name

Kidney Int

journal_title

Kidney international

authors

Gencik M,Meller S,Borgmann S,Fricke H

doi

10.1046/j.1523-1755.2000.00430.x

subject

Has Abstract

pub_date

2000-12-01 00:00:00

pages

2473-7

issue

6

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)47363-6

journal_volume

58

pub_type

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