Antigen specificity of circulating anti-neutrophil cytoplasmic antibodies in inflammatory bowel disease.

Abstract:

OBJECTIVES:To characterize the antigen specificity of circulating anti-neutrophil cytoplasmic antibodies (ANCAs) in inflammatory bowel disease (IBD). DESIGN:Analysis of the prevalence of circulating ANCAs in patients with ulcerative colitis and Crohn's disease, by both non-specific methods (immunofluorescence against fixed neutrophil leukocytes) and specific antigen techniques (against purified neutrophil leukocyte constituents). METHODS:Indirect immunofluorescence against fixed polymorphonuclear leukocytes, and solid-phase enzyme-linked immunosorbent assay (ELISA) against neutrophil constituents (alpha-granules, elastase, myeloperoxidase, cathepsin g, lysozyme and lactoferrin). RESULTS:Although results using immunofluorescence were typical of other studies (ulcerative colitis positive in 41%, Crohn's disease in 10%), ELISA studies showed antibody activity against neutrophil components in 69% of patients with ulcerative colitis and 39% of those with Crohn's disease. Antibodies in ulcerative colitis were commonly directed (in descending order) against lysozyme, cathepsin G, elastase, and lactoferrin, and in Crohn's disease against lysozyme. CONCLUSION:Correlation of indirect immunofluorescence data and ELISA results indicated that even this large panel of specific antigens fails to identify all the ANCA targets in IBD. The lack of correlation between the findings of ANCAs, either in general or versus a specific target, and disease extent or activity in ulcerative colitis supports the suggestion that ANCAs are unlikely to be of primary importance in pathogenesis.

authors

Kossa K,Coulthart A,Ives CT,Pusey CD,Hodgson HJ

subject

Has Abstract

pub_date

1995-08-01 00:00:00

pages

783-9

issue

8

eissn

0954-691X

issn

1473-5687

journal_volume

7

pub_type

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