O-glycosylation of serum IgD in IgA nephropathy

Journal of the American Society of Nephrology : JASN
Alice C SmithJonathan Barratt

Abstract

In IgA nephropathy (IgAN), serum IgA1 with abnormal O-glycosylation preferentially deposits in the glomerular mesangium. The control of O-glycosylation is poorly understood. Among Ig isotypes, only IgD, produced early in B cell development, and IgA1, produced by mature B cells, are O-glycosylated. For investigation of the stage of B cell maturation at which the defect seen in IgAN arises, the O-glycosylation of serum IgA1 and IgD was studied in IgAN and controls. Serum was obtained from 20 patients with IgAN and 20 control subjects. The O-glycosylation profiles of native and desialylated IgA1 and IgD were measured in an ELISA-type system using the lectins Helix aspersa and peanut agglutinin, which bind to alternative forms of O-glycan moieties. The lectin-binding patterns of the two immunoglobulins differed in all participants, with that of IgD suggesting that it is more heavily galactosylated than IgA1. Defective O-glycosylation of IgA1, probably taking the form of reduced galactosylation, was confirmed in IgAN in this study. This undergalactosylation was not shared by IgD; in contrast, IgD carried more galactosylated O-glycans in IgAN than controls. The contrasting lectin-binding patterns of IgA1 and IgD shows that Ig O-glyco...Continue Reading

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Citations

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