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. 1982 Apr;48(1):61–69.

Analysis of circulating IgA and detection of immune complexes in primary IgA nephropathy.

P Lesavre, M Digeon, J F Bach
PMCID: PMC1536564  PMID: 7044634

Abstract

The sera of 31 patients with primary IgA nephropathy were investigated for IgA containing immune complexes by Raji cell-binding IgA radioimmunoassay and conglutinin-binding IgA radioimmunoassay. Positive results, without correlation with IgA serum levels, were found in 68% of the patients using the first assay, in 39% of the patients with the second assay. Positive sera were analysed by gel chromatography. Conglutinin-binding IgA eluted in two peaks, a minor one of 400,000-800,000 daltons mol. wt and a major one corresponding to monomeric IgA. No increase of secretory IgA and of polymeric IgA was detectable. IgA immune complexes were likewise found in the sera of patients with systemic lupus (five of 12), rheumatoid arthritis (four of 12), subacute bacterial endocarditis (four of 12) and HB virus hepatitis (four of 16). However, the high prevalence on these sera of IgG and IgM immune complexes detected by polyethylene glycol precipitation, solid phase Clq binding assay contrasted strongly with their absence in IgA nephropathy. In addition, the presence of abnormal amounts of conglutinin reactive IgA correlated with the recurrence of IgA deposits after renal transplantation (20 patients studied). Conglutinin reactive IgA could contribute to the glomerular deposition of IgA and subsequently play a significant role in the pathogenesis of IgA nephropathy.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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