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Using anti-C3d as a solid phase reagent, C3d fixing circulating immune complexes (CIC) were detected in sera from patients with systemic lupus erythematosus (SLE), rheumatoid arthritis, membranous nephropathy and IgA nephropathy. Particularly, sera from SLE showed the highest CIC levels and highest incidence of positivity among these diseases. In the 51 serum samples from 48 patients with SLE we studied, the CIC detected by the anti-C3d assay correlated well (P less than 0.01) with the CIC detected by the solid phase C1q assay, but not with those detected by the conglutinin assay. In addition, the CIC detected by the anti-C3d assay correlated more significantly (P less than 0.001) with disease activity, as well as some clinical parameters (serum anti-dsDNA antibodies, CH50 and C3 levels) than CIC detected by the other two assays of SLE sera. The anti-C3d binding materials were found to be of intermediate (8-19S) and small (7S) sizes in a small number of SLE sera which we analysed.
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