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Clinical features of patients with anti-neutrophil cytoplasmic autoantibodies targeting native myeloperoxidase antigen.

Authors: Yamanishi, Y  Ito-Ihara, T  Nagao, T  Uno, K  Kobayashi, S  Muso, E  Shane, PY  Firestein, GS  Hashimoto, H  Okazaki, T  Suzuki, K 
Citation: Yamanishi Y, etal., Mod Rheumatol. 2012 Oct 21.
Pubmed: (View Article at PubMed) PMID:23085883
DOI: Full-text: DOI:10.1007/s10165-012-0781-z

OBJECTIVES: Anti-neutrophil cytoplasmic autoantibodies (ANCA) are useful diagnostic markers in systemic vasculitic disorders with small-vessel involvement, but depending on the particular test used, the myeloperoxidase (MPO)-ANCA results are variable. In the present study, we performed a comparative analysis between our originally developed nMPO-ANCA assay that targets the native MPO antigen and other commercially available assays using sera of patients with clinical features of ANCA-associated vasculitis (AAV). METHODS: Sera of 24 patients strongly suspected of having AAV were examined for the presence of MPO-ANCAs by our nMPO-ANCA assay and by other commercial-based MPO-ANCA assays. These results were correlated to indirect immunofluorescence microscopy staining patterns and patient clinical parameters. RESULTS: Eighteen out of 24 patients (75 %) were positive for nMPO-ANCA, compared with 13 out of 24 patients (54 %) by one of the most frequently used commercial-based MPO-ANCA enzyme-linked immunosorbent assays (ELISAs) in Japan. Interestingly, the patients who tested positive with our nMPO-ANCA assay alone showed clinical features of AAV marked by continuous fever, polyarthritis, and mild nephritis. The titers of nMPO-ANCA decreased in association with clinical improvement after treatment. CONCLUSIONS: Our data suggest that a positive nMPO-ANCA result, which identifies antibodies to human native MPO antigen, correlates with AAV disease activity. Moreover, the nMPO-ANCA test has clinical utility in detecting AAV-affected patients who have tested negative using commercially available assays.

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CRRD Object Information
CRRD ID: 7174703
Created: 2012-11-15
Species: All species
Last Modified: 2012-11-15
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.