Generation of colonic IgA-secreting cells in the caecal patch
Kazunori Masahata, Eiji Umemoto, Hisako Kayama, Manato Kotani, Shota Nakamura, Takashi Kurakawa, Junichi Kikuta, Kazuyoshi Gotoh, Daisuke Motooka, Shintaro Sato, Tomonori Higuchi, Yoshihiro Baba, Tomohiro Kurosaki, Makoto Kinoshita, Yosuke Shimada, Taishi Kimura, Ryu Okumura, Akira Takeda, Masaru Tajima, Osamu Yoshie, Masahiro Fukuzawa, Hiroshi Kiyono, Sidonia Fagarasan, Tetsuya Iida, Masaru Ishii, Kiyoshi Takeda, Kazunori Masahata, Eiji Umemoto, Hisako Kayama, Manato Kotani, Shota Nakamura, Takashi Kurakawa, Junichi Kikuta, Kazuyoshi Gotoh, Daisuke Motooka, Shintaro Sato, Tomonori Higuchi, Yoshihiro Baba, Tomohiro Kurosaki, Makoto Kinoshita, Yosuke Shimada, Taishi Kimura, Ryu Okumura, Akira Takeda, Masaru Tajima, Osamu Yoshie, Masahiro Fukuzawa, Hiroshi Kiyono, Sidonia Fagarasan, Tetsuya Iida, Masaru Ishii, Kiyoshi Takeda
Abstract
Gut-associated lymphoid tissues are responsible for the generation of IgA-secreting cells. However, the function of the caecal patch, a lymphoid tissue in the appendix, remains unknown. Here we analyse the role of the caecal patch using germ-free mice colonized with intestinal bacteria after appendectomy. Appendectomized mice show delayed accumulation of IgA(+) cells in the large intestine, but not the small intestine, after colonization. Decreased colonic IgA(+) cells correlate with altered faecal microbiota composition. Experiments using photoconvertible Kaede-expressing mice or adoptive transfer show that the caecal patch IgA(+) cells migrate to the large and small intestines, whereas Peyer's patch cells are preferentially recruited to the small intestine. IgA(+) cells in the caecal patch express higher levels of CCR10. Dendritic cells in the caecal patch, but not Peyer's patches, induce CCR10 on cocultured B cells. Thus, the caecal patch is a major site for generation of IgA-secreting cells that migrate to the large intestine.
Source: PubMed