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Immune regulation by Fcα/μ receptor ( CD 351) on marginal zone B cells and follicular dendritic cells
Author(s) -
Shibuya Akira,
Honda Shinichiro
Publication year - 2015
Publication title -
immunological reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.839
H-Index - 223
eISSN - 1600-065X
pISSN - 0105-2896
DOI - 10.1111/imr.12345
Subject(s) - germinal center , follicular dendritic cells , biology , microbiology and biotechnology , immune system , marginal zone , receptor , endocytosis , cd40 , immunology , b cell , dendritic cell , tlr4 , affinity maturation , cytokine , proinflammatory cytokine , antibody , antigen presenting cell , inflammation , t cell , cytotoxic t cell , biochemistry , in vitro
Summary Although both Fcα/μ receptor (Fcα/μR) and polymeric Ig receptor (poly‐IgR) are Fc receptors for IgA and IgM and are functionally and genetically related, the expression profile of Fcα/μR is unique. Unlike poly‐IgR, Fcα/μR is expressed on marginal zone ( MZ ) B cells and follicular dendritic cells, suggesting that Fcα/μR plays an important role in humoral immune responses. Fcα/μR mediates endocytosis of the IgM immune complex ( IC ). Recent research demonstrated that Fcα/μR downregulated retention of the IgM IC with a T‐independent ( TI ) antigen on MZ B cells and follicular dendritic cells due to endocytosis of the IgM IC , suppressing germinal center formation, affinity maturation, and memory B‐cell generation in response to TI antigen challenge. In addition, Fcα/μR physically associates with Toll‐like receptor 4 ( TLR 4) and augments TLR 4 oligomerization and signaling in MZ B cells upon lipopolysaccharide (LPS) challenge, leading to increased proinflammatory cytokine production by MZ B cells. Thus, Fcα/μR is a unique Fc receptor that is involved in humoral immune responses and inflammation.