Abstract
The presence or absence of terminal sialic acid residues in the sugar moiety attached to the Fc-domain of IgG molecules modulates IgG activity and is associated with autoimmune or infection related inflammation. In a recent paper, Oswald and colleagues suggest that IgG sialylation may occur post IgG secretion from plasma cells, which would be a major issue for therapeutic antibodies injected into patients. In contrast, we argue that previous work rather demonstrates that IgG sialylation occurs within B cells and that the experimental system used by the authors is not suitable to address this critical question.
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