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Presse Med. 2012 Sep;41(9 Pt 2):e461-6. doi: 10.1016/j.lpm.2012.05.019. Epub 2012 Aug 9.

Pathogenic role of anti-M3 muscarinic acetylcholine receptor immune response in Sjögren's syndrome.

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  • 1University of Tsukuba, Department of Internal Medicine, Ibaraki, Japan. tsumida@md.tsukuba.ac.jp

Abstract

M3 muscarinic acetylcholine receptor (M3R) is expressed in exocrine glands (e.g., salivary glands [SGs] and lachrymal glands), and plays a crucial role in exocrine secretion. M3R reactive T cells have been detected in circulating mononuclear cells of 40% of patients with Sjögren's syndrome (SS), and the major T cell epitopes of M3R in those patients with HLA-DR B1×0901 are located in the second loop of M3R. Moreover, autoantibodies (autoAbs) against M3R are also present in sera of around 50% of patients with SS, and several B cell epitopes, such as N-region, 1st, 2nd, and 3rd loop of M3R, have been identified. Functional analysis using human SG cell lines showed that autoAbs against the 2nd loop of M3R suppressed intracellular Ca(2+) influx, suggesting inhibition of saliva secretion. To clarify whether the M3R reactive immune response induces autoimmune sialadenitis (AIS), M3R(-/-) mice were immunized with M3R synthetic peptides and their splenocytes transferred into Rag1(-/-) mice. The recipients developed severe sialadenitis, and cell transfer studies indicated that T cells are key factors in the pathogenesis of AIS. These results indicate that the M3R immune reaction plays a key pathogenic role in AIS, suggesting that M3R molecule acts as an autoantigen in the pathogenesis of SS.

Copyright © 2012 Elsevier Masson SAS. All rights reserved.

[PubMed - indexed for MEDLINE]
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