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. 1995 Jan;99(1):49–56. doi: 10.1111/j.1365-2249.1995.tb03471.x

Bactericidal/permeability-increasing protein (BPI) is an important antigen for anti-neutrophil cytoplasmic autoantibodies (ANCA) in vasculitis.

M H Zhao 1, S J Jones 1, C M Lockwood 1
PMCID: PMC1534142  PMID: 7813109

Abstract

Indirect immunofluorescence (IIF) techniques have shown that ANCA are useful serological markers for some small vessel vasculitides, and ELISA assays, using purified molecules as solid-phase ligand, have helped to identify proteinase 3 (PR3) and myeloperoxidase (MPO) as two of the major ANCA antigens. There remain a substantial number of serum samples, which are positive by IIF, yet recognize neither PR3 nor MPO (double-negative samples). We found, by Western blot analysis of soluble neutrophil granule proteins, that certain of these double-negative samples recognized a 55-kD doublet of which the first eight residues shared N-terminal amino acid sequence homology with BPI, a potent antibiotic towards Gram-negative bacteria. We developed a simple, quick and robust two-step immunobiochemical method to purify BPI. This was then employed to detect anti-BPI autoantibodies by ELISA and Western blot analysis. We tested 100 double-negative samples and 400 consecutive new samples sent for routine ANCA testing in the anti-BPI ELISA. We found that 45 of the 100 double-negative and 44 of the 400 new routine samples recognized BPI. By Western blot analysis 20/20 positive anti-BPI samples blotted the 55-kD protein. Inhibition assays confirmed the specificity of binding. Review of the 89 anti-BPI-positive patients showed a male dominance (M:F ratio 55:34), a mean age of 60.4 years and clinical diagnoses ranging from organ limited vasculitis to widespread systemic vasculitis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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