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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Commun 2017 ; 8 (ä): ä Nephropedia Template TP
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Allograft inflammatory factor 1 is a regulator of transcytosis in M cells #MMPMID28224999
Kishikawa S; Sato S; Kaneto S; Uchino S; Kohsaka S; Nakamura S; Kiyono H
Nat Commun 2017[]; 8 (ä): ä PMID28224999show ga
M cells in follicle-associated epithelium (FAE) are specialized antigen-sampling cells that take up intestinal luminal antigens. Transcription factor Spi-B regulates M-cell maturation, but the molecules that promote transcytosis within M cells are not fully identified. Here we show that mouse allograft inflammatory factor 1 (Aif1) is expressed by M cells and contributes to M-cell transcytosis. FAE in Aif1?/? mice has suppressed uptake of particles and commensal bacteria, compared with wild-type mice. Translocation of Yersinia enterocolitica, but not of Salmonella enterica serovar Typhimurium, leading to the generation of antigen-specific IgA antibodies, is also diminished in Aif1-deficient mice. Although ?1 integrin, which acts as a receptor for Y. enterocolitica via invasin protein, is expressed on the apical surface membranes of M cells, its active form is rarely found in Aif1?/? mice. These findings show that Aif1 is important for bacterial and particle transcytosis in M cells.