Abstract:
BACKGROUND:Anti-neutrophil cytoplasmic antibodies (ANCA) against proteinase 3 are diagnostic of Wegener's granulomatosis, but ANCA occur also in patients with other inflammatory disorders, such as ulcerative colitis, primary sclerosing cholangitis (PSC) and autoimmune hepatitis. As their predictive value for autoimmune liver disease remains unknown, we analysed the prevalence and antigen specificity of ANCA in patients with various chronic liver diseases (CLD). METHODS:We studied sera from 100 patients with primary biliary cirrhosis (PBC), from 76 with PSC and from 279 with various CLD, consecutively drawn during a 5-year period at the time of liver biopsy. The ANCA were detected by indirect immunofluorescence (IIF) while the antigen specificity was characterized by ELISA by using lactoferrin, neutrophil elastase, cathepsin G and BPI (bactericidal/permeability increasing protein) as antigens. RESULTS:In PBC, ANCA were detected by IIF in 39 patients (39%). The antigen reactivity by ELISA was lactoferrin in seven, elastase in 15, BPI in 20 and cathepsin G in four patients. Four patients had reactivity against more than one antigen. In PSC, IIF demonstrated ANCA in 49 patients (65%). The antigen reactivity was lactoferrin in 17, elastase in 14, BPI in 20 and cathepsin G in four patients. Twelve patients showed reactivity against more than one antigen. In CLD, ANCA were observed in sera from 55 patients (20%). Nineteen of 45 patients (42%) with autoimmune liver disease were ANCA positive versus 36/234 (15%) with non-autoimmune liver disease (P = 0.0002). Among IIF-positive patients, antibody reactivity against lactoferrin was noted in 14, elastase in 28, BPI in 25 and cathepsin G in five patients. Twenty-one patients had reactivity against more than one antigen. Elastase and BPI antibodies occurred more frequently in patients with autoimmune compared to non-autoimmune liver disease (P < 0.01). CONCLUSIONS:Anti-neutrophil cytoplasmic antibodies are prevalent in patients with chronic liver diseases, but although they occur more frequently in patients with autoimmune liver disease their specificity and sensitivity for autoimmune liver disease is low. The predominant antigens are lactoferrin, elastase and BPI, but the correlation between IIF findings and ELISA reactivity against these antigens is weak.
journal_name
J Gastroenterol Hepatoljournal_title
Journal of gastroenterology and hepatologyauthors
Lindgren S,Nilsson S,Nässberger L,Verbaan H,Wieslander Jdoi
10.1046/j.1440-1746.2000.02078.xsubject
Has Abstractpub_date
2000-04-01 00:00:00pages
437-42issue
4eissn
0815-9319issn
1440-1746journal_volume
15pub_type
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