title: Human Fcalpha/muR and pIgR distribute differently in intestinal tissues.
abstract: Fcalpha/muR, an Fc receptor for both IgA and IgM, is close to pIgR in gene location and has an Ig-like domain homologous to pIgR. In this study, we generated monoclonal antibodies and determined Fcalpha/muR and pIgR distributions in human intestinal tissues. Immunohistochemistry analysis showed that, unlike pIgR, which was expressed on epithelial cells of intestinal tissues, Fcalpha/muR was expressed mainly in the intestinal lamina propria and germinal centers of some lymphoid follicles. Double label immunohistochemistry analysis showed that Fcalpha/muR was expressed on intestinal macrophages and plasma cells. Fcalpha/muR was also expressed in Paneth cells. Similar expression patterns for Fcalpha/muR were observed in the small intestine, appendix, colon and rectum. These results indicate for the first time that Fcalpha/muR protein is expressed by human intestinal tissues. The different tissue distribution patterns indicate that Fcalpha/muR and pIgR have different roles in intestinal immunity.
authors.affiliation: Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, School of Basic Medicine, Peking Union Medical College, 5 Dong Dan San Tiao, Beijing 100005, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Wang
authors.forename: Ying
authors.initials: Y
authors.lastname: Fu
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhao
authors.forename: Lin
authors.initials: L
authors.lastname: Pan
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang