title: MUC1 epithelial mucin (CD227) is expressed by activated dendritic cells.
abstract: The MUC1 mucin (CD227) is a cell surface mucin originally thought to be restricted to epithelial tissues. We report that CD227 is expressed on human blood dendritic cells (DC) and monocyte-derived DC following in vitro activation. Freshly isolated murine splenic DC had very low levels of CD227; however, all DC expressed CD227 following in vitro culture. In the mouse spleen, CD227 was seen on clusters within the red pulp and surrounding the marginal zone in the white pulp. Additionally, we confirm CD227 expression by activated human T cells and show for the first time that the CD227 cytoplasmic domain is tyrosine-phosphorylated in activated T cells and DC and is associated with other phosphoproteins, indicating a role in signaling. The function of CD227 on DC and T cells requires further elucidation.
authors.affiliation: Dendritic Cell, Mater Medical Research Institute, Mater Misericordiae Hospitals, South Brisbane, Australia.
authors.forename: M
authors.initials: M
authors.lastname: Wykes
authors.forename: K P A
authors.initials: KP
authors.lastname: MacDonald
authors.forename: M
authors.initials: M
authors.lastname: Tran
authors.forename: R J
authors.initials: RJ
authors.lastname: Quin
authors.forename: P X
authors.initials: PX
authors.lastname: Xing
authors.forename: S J
authors.initials: SJ
authors.lastname: Gendler
authors.forename: D N J
authors.initials: DN
authors.lastname: Hart
authors.forename: M A
authors.initials: MA
authors.lastname: McGuckin
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology; D039521:CD11c Antigen / Q000276:immunology; D002478:Cells, Cultured; D003593:Cytoplasm; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology*; D006801:Humans; D007694:Killer Cells, Natural / Q000166:cytology / Q000276:immunology; D008213:Lymphocyte Activation; D051379:Mice; D008810:Mice, Inbred C57BL; D018396:Mucin-1 / Q000276:immunology*; D010766:Phosphorylation; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology
chemical_list: D039521:CD11c Antigen; D018396:Mucin-1