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By Ana Monteiro Md/phd student
Cees G M Kallenberg, Peter Heeringa, Coen A Stegeman
Wegener's granulomatosis and microscopic polyangiitis are idiopathic systemic vasculitides strongly associated with antineutrophil cytoplasmic autoantibodies (ANCA). In Wegener's granulomatosis, ANCA are mostly directed against proteinase 3 (PR3), whereas in microscopic polyangiitis ANCA are directed against myeloperoxidase; increases in levels of these autoantibodies precede or coincide with clinical relapses in many cases. In vitro, ANCA can further activate primed neutrophils to release reactive oxygen species and lytic enzymes, and, in conjunction with neutrophils, can damage and lyse endothelial cells...
December 2006: Nature Clinical Practice. Rheumatology
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