Abstract
Binding capacity of serum IgA to jacalin in 22 patients with IgA nephropathy, 14 patients with diffuse mesangial proliferative glomerulonephritis (non-IgA nephropathy) and 20 age-matched healthy adults was examined by enzyme-linked immunoassay (ELISA) using jacalin-coated microplates. In contrast to previous findings, the binding capacity of serum IgA to jacalin in patients with IgA nephropathy measured by ELISA using jacalin-coated microplates was significantly higher than that in healthy adults. The ratio of serum IgA levels measured by this method to those obtained by single radial immunodiffusion was significantly increased in patients with IgA nephropathy. It appeared that the capacity of serum IgA binding to jacalin was marked in these patients. It is concluded that the binding capacity of serum IgA to jacalin is not ubiquitously impaired in all patients with IgA nephropathy.
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