Immunol Cell Biol. 2003 Oct;81(5):374-81.

The role of FcgammaRIIa as an inflammatory mediator in rheumatoid arthritis and systemic lupus erythematosus.

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Austin Research Institute, Kronheimer Building, Austin and Repatriation Medical Centre, Melbourne, Australia. c.tan@ari.unimelb.edu.au

Abstract

Despite their essential role in host protection, immunoglobulins are also involved in autoimmune processes where antibodies recognize the host's own tissue, triggering inflammatory responses that result in extensive tissue damage. A complex interaction of genetic predisposition, together with environment factors, is thought to trigger immune dysfunction. Although recent studies have dissected the essential role of Fc receptors in autoimmune antibody mediated processes, the uniquely human FcgammaRIIa has not been studied in detail. This Fc receptor is of particular interest, as it is the most abundantly expressed Fc receptor in humans and is implicated in immune complex disease. Investigation of its role has been hampered to date due to lack of suitable animal models. This review examines the evidence for the direct role of this receptor in diseases such as systemic lupus erythematosus and rheumatoid arthritis.

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