Abstract:
:Wegener's autoantigen (WA), a 29 kD multifunctional protein, is the principal target antigen of autoantibodies associated with Wegener's granulomatosis (WG). WA was first identified as proteinase 3 (PR3), which is now known to be identical with myeloblastin and AGP7. Like other lysosomal proteins, WA/PR3 displays enzymatic activity, differentiation factor activity for myeloid precursor cells, and antimicrobial functions. Neutrophilic polymorphonuclear leukocytes (PMN) and a subpopulation of monocytes contain high levels of WA/PR3 in their myeloperoxidase-positive granules. The autoantibodies from WG sera produce a finely granular, centrally accentuated fluorescence pattern on PMN and monocytes and have been designated 'classic' pattern antineutrophil cytoplasmic autoantibodies (cANCA). However, PMN/monocyte activation (in vitro/ex vivo) is associated with the translocation of WA/PR3 on the cytoplasm membrane. WA/PR3 is accessible to the WG-associated autoantibody: cANCA stimulate cytokine-preactivated PMN to produce oxygen radicals and to degranulate. Furthermore, cANCA interfere with the biological functions of WA/PR3 (e.g. inhibition of elastinolytic activity). Hence, cANCA represents not only the best seromarker for WG so far available, but several lines of evidence indicate that the autoantibodies against WA/PR3 play a major role in the pathogenesis of this enigmatic disease.
journal_name
J Autoimmunjournal_title
Journal of autoimmunityauthors
Gross WL,Csernok E,Flesch BKdoi
10.1006/jaut.1993.1015subject
Has Abstractpub_date
1993-04-01 00:00:00pages
171-84issue
2eissn
0896-8411issn
1095-9157pii
S0896-8411(83)71015-2journal_volume
6pub_type
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