Lupus/Sjögren's Autoantibody Specificities in Sera with Paraproteins

Overview

Journal J Clin Invest

Specialty General Medicine

Date 1987 Jul 1

PMID 3496360

Citations 6

Authors

A L Sestak

J B Harley

S Yoshida

M Reichlin

Affiliations

Soon will be listed here.

Abstract

Antinuclear antibody and anti-RNA-protein autoantibodies were determined in 143 sera containing paraproteins and 39 control sera. Antinuclear antibodies were commonly present in the paraprotein sera by indirect immunofluorescence. 19 of 143 sera (13%) had elevated anti-Ro/SSA activity in a solid phase Ro/SSA binding assay, and 5 (3.5%) had Ro/SSA precipitating autoantibody. Eighteen sera had La/SSB binding autoantibodies (12%) but only one had an anti-La/SSB precipitin. Anti-nRNP(Sm) was not detected in any of these sera. The solid phase anti-RNA protein assays were repeated using anti-lambda and anti-kappa conjugates. Both lambda and kappa light chain autoantibodies were found in all positive sera consistent with polyclonal anti-Ro/SSA and anti-La/SSB responses. Paraprotein sera containing Ro/SSA precipitins were analyzed by isoelectric focusing followed by exposure to 125I-labeled Ro/SSA and autoradiography. All sera with anti-Ro/SSA binding paraproteins also contained polyclonal anti-Ro/SSA. Our data are consistent with the hypothesis that anti-Ro/SSA paraproteins are common and arise from a previously present polyclonal anti-Ro/SSA response.

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