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. 1988 Aug;73(2):300–306.

Serum IgA preferentially binds to cationic polypeptides in IgA nephropathy.

R C Monteiro 1, A Chevailler 1, L H Noel 1, P Lesavre 1
PMCID: PMC1541587  PMID: 3052947

Abstract

The observation of negatively charged IgA in the mesangium of patients with primary IgA nephropathy (IgA-GN) prompted us to study the charge of serum IgA in IgA-GN, Henoch Schönlein purpura (HSP), alcoholic liver cirrhosis (ALC), membranous nephropathy (MGN) and systemic lupus erythematosus (SLE). Since no abnormal distribution of IgA isoelectric points was detected by isoelectric focusing studies, we developed a sensitive charge-dependent assay using plates coated with either cationized BSA (cBSA) or poly-L-lysine. In 15 IgA-GN sera, the amount of IgA reacting specifically with cBSA (cBSA-IgA) was almost linearly correlated with the poly-L-lysine-binding IgA (r = 0.97, P = 0.0006), suggesting that both assays detect charge-dependent interactions and thus probably measure anionic IgA. Significantly high serum levels of cBSA-IgA were observed in 56% of IgA-GN patients and in 40% of ALC patients. In contrast, normal serum levels of cBSA-IgA were detected in HSP, MGN and SLE. Both, the mono- or polymeric IgA bound to cBSA in a patient's serum studied. Contrasting with the presence of anionic IgA, no increase of cBSA-IgG was observed in IgA-GN. IgA rheumatoid factor (IgA-RF) assay showed high levels in IgA-GN (39%) and in ALC (25%). IgA-RF levels did not correlate with the amount of cBSA-IgA. When 18 patients with IgA-GN were tested after kidney transplantation, increased levels of cBSA-IgA and/or IgA-RF were found to be associated with the recurrence of mesangial IgA deposits in the graft. This suggests that both negatively charged IgA and IgA-RF may play a role in the recurrence of mesangial IgA deposits.

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Selected References

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