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K D Muller

Publications and source records attributed to K D Muller.

3 recordsLinked to original sources

The effect of IgA immune complexes on the proliferation of cultured human mesangial cells.

To investigate the role of IgA-containing circulating immune complexes (IgA-CIC) in mesangial cell proliferation, human mesangial cells were cultured with sera or IgA isolates from IgA-CIC-positive IgA nephropathy patients and negative controls. A solid phase anti-C3d enzyme-linked immunosorbent assay (ELISA) was used for the detection of IgA-CIC. Sera stimulated the proliferation of the mesangial cells at both 24 and 72 hours' incubation. However, there was no difference in the proliferation of cells incubated with sera from IgA-CIC-positive patients and negative controls. IgA-CIC-positive and negative IgA isolates both stimulated proliferation of mesangial cells at 24 hours' incubation. Our data do not support the hypothesis that IgA-CIC are directly responsible for mesangial cell proliferation.

Antigen-Antibody Complex

Circulating immune complexes in systemic lupus erythematosus: a reappraisal of the solid phase C1q radioimmunoassay.

Data from a pool of 150 patients with systemic lupus erythematosus (SLE) were used to evaluate the clinical usefulness and specificity of the solid phase C1q radioimmunoassay (SPC1q RIA) for circulating immune complexes (CIC). We found that the assay results correlated with the severity of lupus nephritis but that they did not adequately reflect or predict disease activity so as to directly influence decisions regarding treatment. In addition, the contribution of non-IC reactants to the assay results was found to be of some concern. Finally, we could not demonstrate the presence of anti-DNA antibodies in CIC from patients with SLE.

Antigen-Antibody Complex