TITLE

Prevalence and clinical significance of isotype specific antinuclear antibodies in primary biliary cirrhosis

AUTHOR(S)
Rigopoulou, E. I.; Davies, E. I.; Pares, A.; Zachou, K.; Liaskos, C.; Bogdanos, D.-P.; Rodes, J.; Dalekos, G. N.; Vergani, D.
PUB. DATE
April 2005
SOURCE
Gut;Apr2005, Vol. 54 Issue 4, p528
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background: Antinuclear antibodies (ANA) giving a rim-like/membranous (RL/M) or a multiple nuclear dot (MND) pattern are highly specific for primary biliary cirrhosis (PBC). Aim and subjects: To assess the prevalence of PBC specific ANAs, their lg isotype, and their clinical significance in 90 PBC patients from Greece and Spain. Twenty eight patients with chronic hepatitis C, 23 patients with systemic lupus erythematosus, and 17 healthy subjects were studied as controls. Methods: PBC specific ANA reactivity was tested by indirect immunofluorescence using HEp2 cells as substrate and individual Ig class (lgG, IgA, 1gM) and lgG subclass (IgG1, lgG2, lgG3, lgG4) specific antisera as revealing reagents. Results: Fourteen of 90 (15.6%) PBC patients had PBC specific ANA reactivity when an anti-lgG (total) antiserum was used as the revealing reagent while 58 (64.4%) were positive when specific antisera to each of the four lgG isotypes were used. The prevailing isotype was lgG3 for MND and IgGI for RL/M. PBC patients with specific ANA, in particular of the lgG3 isotype, had significantly more severe biochemical and histological disease compared with those who were seronegative. None of the controls was positive. Conclusions: Disease specific ANA are present in the majority of patients with PBC when investigated at the level of immunoglobulin isotype. PBC specific ANA, in particular of the lgG3 isolype, are associated with a more severe disease course, possibly reflecting the peculiar ability of this isotype to engage mediators of damage.
ACCESSION #
16556658

 

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