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Am J Kidney Dis. 2013 Dec;62(6):1176-87. doi: 10.1053/j.ajkd.2013.05.009. Epub 2013 Jun 28.

Pathogenesis of ANCA-associated vasculitis: new possibilities for intervention.

Author information

1
Department of Rheumatology & Clinical Immunology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands. Electronic address: c.g.m.kallenberg@umcg.nl.

Abstract

The antineutrophil cytoplasmic antibody (ANCA)-associated vasculitides (AAVs) comprise granulomatosis with polyangiitis (GPA), primarily associated with antibodies to proteinase 3 (PR3-ANCA); microscopic polyangiitis (MPA); and eosinophilic granulomatosis with polyangiitis (EGPA), both principally associated with antibodies to myeloperoxidase (MPO-ANCA). Genetic and environmental factors are involved in their etiopathogenesis, with a possible role for silica exposure in AAVs and Staphylococcus aureus infection in GPA. The distinct associations of PR3-ANCA and MPO-ANCA with different HLA class II antigens, which are stronger than those with the associated diseases, suggest a pathogenic role for those ANCAs and indicate that GPA and MPA are different diseases. Both in vitro and in vivo experimental data have shown that MPO-ANCA can induce necrotizing small-vessel vasculitis and glomerulonephritis. The additional role of the alternative pathway of complement activation has been demonstrated in human and experimental pathology. Also, T cells seem to be involved in lesion development, particularly in the kidney. Granuloma formation, as seen in PR3-ANCA-associated GPA, is not well explained by the presence of autoantibodies in experimental models. Here, T cells seem crucial. Recently obtained insights into the pathogenesis of AAVs have led to more targeted treatment of these life-threatening diseases.

KEYWORDS:

Antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis; antibodies to myeloperoxidase (MPO-ANCA); antibodies to proteinase 3 (PR3-ANCA); granulomatosis with polyangiitis (GPA); microscopic polyangiitis (MPA); pathogenesis

PMID:
23810690
DOI:
10.1053/j.ajkd.2013.05.009
[Indexed for MEDLINE]

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