Skewed Fc glycosylation profiles of anti-proteinase 3 immunoglobulin G1 autoantibodies from granulomatosis with polyangiitis patients show low levels of bisection, galactosylation, and sialylation

Journal of Proteome Research
Manfred WuhrerMatthew Morgan

Abstract

Granulomatosis with polyangiitis (GPA) is associated with circulating immunoglobulin (Ig) G anti-proteinase 3 specific (anti-PR3) anti-neutrophil cytoplasm antibodies (ANCA), which activate cytokine primed neutrophils via Fcgamma receptors. ANCA are class switched IgG antibodies implying T cell help in their production. Glycosylation of IgG Fc, under the control of T cell cytokines, determines the interaction between IgG and its receptors. Previous studies have reported aberrant glycosylation of Ig Fc in GPA patients. We investigated whether aberrant Fc glycosylation was present on anti-PR3 ANCA as well as whole IgG subclass preparations compared to healthy controls and whether this correlated with Birmingham vasculitis activity scores (BVAS), serum cytokines, and time to remission. Here, IgG Fc glycosylation of GPA patients and controls and anti-PR3 ANCA Fc glycosylation were determined by mass spectrometry of glycopeptides. IgG1 and IgG2 subclasses from GPA patients showed reduced galactosylation, sialylation, and bisection compared to healthy controls. Anti-PR3 IgG1 ANCA Fc galactosylation, sialylation, and bisection were reduced compared to total IgG1 in GPA. Galactosylation of anti-PR3 ANCA Fc correlated with inflammatory ...Continue Reading

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