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Clinical and Experimental Immunology logoLink to Clinical and Experimental Immunology
. 1995 Oct;102(1):131–136. doi: 10.1111/j.1365-2249.1995.tb06646.x

Anti-M4 antibodies measured by a sulphite oxidase ELISA in patients with both anti-centromere and anti-M2 antibodies.

C C Bunn 1, M McMorrow 1
PMCID: PMC1553322  PMID: 7554379

Abstract

In this study the clinical features of patients with a serological overlap between scleroderma and primary biliary cirrhosis (PBC) were analysed. The entity was defined by the presence of both anti-centromere antibody (ACA) and anti-mitochondrial antibodies to the M2 antigen, pyruvate dehydrogenase. In addition the sera were assayed for anti-mitochondrial antibodies to the M4 antigen measured by an ELISA to sulphite oxidase (SO). First, anti-M2 was detected, not only in 58 out of 60 patients with PBC but also in eight out of 61 patients with ACA. These sera, together with sera from 53 normals and 99 from patients with various connective tissue diseases were then evaluated for anti-SO, which has been proposed by Klein and Berg to be a marker of progressive liver disease. Again, a high proportion (62%) of sera from patients with PBC were positive for anti-SO, and three of the eight patients who had ACA and anti-M2 also reacted with SO. We subsequently identified and included for study a further 10 patients positive for ACA and anti-M2, making a total of 18 patients with this profile. Features of limited cutaneous scleroderma were present in 94% and evidence of liver disease in 56%. Eight out of the 18 patients had anti-SO, and of these four had PBC, two had abnormal biochemical liver function tests but two had no evidence of liver disease. These data confirm that detection of anti-SO is limited to an anti-M2 subpopulation, and may be a marker for liver involvement with prognostic significance in scleroderma patients with ACA.

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Selected References

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