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Masaru Yoshida, Kanna Kobayashi, Timothy T. Kuo, Lynn Bry, Jonathan N. Glickman, Steven M. Claypool, Arthur Kaser, Takashi Nagaishi, Darren E. Higgins, Emiko Mizoguchi, Yoshio Wakatsuki, Derry C. Roopenian, Atsushi Mizoguchi, Wayne I. Lencer, Richard S. Blumberg
J Clin Invest. 2006;
116(8):2142
doi:10.1172/JCI27821
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T
he neonatal Fc receptor for IgG (FcRn) plays a major role in regulating host IgG levels and transporting IgG and associated antigens across polarized epithelial barriers. Selective expression of FcRn in the epithelium is shown here to be associated with secretion of IgG into the lumen that allows for defense against an epithelium-associated pathogen (Citrobacter rodentium). This pathway of host resistance to a bacterial pathogen as mediated by FcRn involves retrieval of bacterial antigens from the lumen and initiation of adaptive immune responses in regional lymphoid structures. Epithelial-associated FcRn, through its ability to secrete and absorb IgG, may thus integrate luminal antigen encounters with systemic immune compartments and as such provide essential host defense and immunoregulatory functions at the mucosal surfaces.
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