Abstract
Immunoglobulin G (IgG) molecules can have two completely opposing activities. They can be very potent pro-inflammatory mediators on the one hand, directing the effector functions of the innate immune system towards infected cells, tumor cells or healthy tissues in the case of autoimmune diseases. On the other hand, a mixture of IgG molecules purified from the blood of ten thousands of healthy donors is used as an anti-inflammatory treatment for many autoimmune diseases since several decades. It has become evident only recently that certain residues in the sugar moiety attached to the IgG constant fragment can dramatically alter the pro- and anti-inflammatory activities of IgG. This review will focus on sialic acid residues as a modulator of the anti-inflammatory activity and provide an overview of situations where serum IgG glycosylation and sialylation is altered and which molecular and cellular pathways may be involved in this immunomodulatory pathway.
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Acknowledgments
This work was supported by grants from the German Research Foundation (SFB 643, FOR 832, SPP 1468, GK 1660), the Bavarian Genome Research Network and the Paul-Ehrlich and Ludwig-Darmstädter Foundation. We apologize to all our colleagues whose important work could not be cited directly in this manuscript. These references can be found in the excellent review articles cited in the paper.
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This article is published as part of the Special Issue on Glycosylation and Immunity [34:3].
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Böhm, S., Schwab, I., Lux, A. et al. The role of sialic acid as a modulator of the anti-inflammatory activity of IgG. Semin Immunopathol 34, 443–453 (2012). https://doi.org/10.1007/s00281-012-0308-x
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DOI: https://doi.org/10.1007/s00281-012-0308-x