Clin Exp Immunol. 1992 Apr;88(1):56-61.

Anti-mitochondrial antibody IgG subclass distribution and affinity in primary biliary cirrhosis.

Zhang L, Weetman AP, Jayne DR, Turner I, Yeaman SJ, Bassendine MF, Oliveira DB.

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Department of Medicine, School of Clinical Medicine, University of Cambridge, England.

Abstract

We have studied the total IgG subclass and anti-mitochondrial antibody (AMA) specific IgG subclass distribution in primary biliary cirrhosis (PBC) sera. In order to solve the problems caused by the differing affinities of subclass specific monoclonals and the competitive inhibition of antibodies in a whole serum assay, six sera were separated into subclass-specific fractions by affinity-depletion chromatography. AMA subclass distribution of 20 further sera from patients with PBC was assessed using conventional methods and the results were calibrated against one of the fractionated sera. Light chain distribution and AMA functional affinity were also assessed for the fractionated subclasses. Total amounts of IgG3 were significantly increased compared with normal controls. AMA were found in all IgG subclasses and not restricted predominantly to IgG3 as previously described. The functional affinity of IgG3 AMA is generally lower as compared with that of other subclasses. No light chain restriction was found.

PMID:: 1563107; [PubMed - indexed for MEDLINE]
PMCID:: PMC1554353

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Wellcome Trust/United Kingdom

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