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CORRESPONDENCE J.V.R.: ravetch{at}rockefeller.edu

ABSTRACT
How high doses of intravenous IgG (IVIG) suppress autoimmune diseases remains unresolved. We have recently shown that the antiinflammatory activity of IVIG can be attributed to a minor species of IgGs that is modified with terminal sialic acids on their Fc-linked glycans. Here we propose that these Fc-sialylated IgGs engage a unique receptor on macrophages that, in turn, leads to the upregulation of an inhibitory Fc receptor (FcR), thereby protecting against autoantibody-mediated pathology.

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