title: CD43 functions as a ligand for E-Selectin on activated T cells.
abstract: E-selectin, an inducible cell adhesion molecule expressed on endothelial cells, mediates the rolling on endothelium of leukocytes expressing E-selectin ligands, such as neutrophils and activated T cells. Although previous studies using mice lacking P-selectin glycoprotein ligand-1 (PSGL-1) have indicated that PSGL-1 on Th1 cells functions as an E-selectin ligand, the molecular nature of E-selectin ligands other than PSGL-1 remains unknown. In this study, we show that a 130-kDa glycoprotein was precipitated by an E-selectin-IgG chimera from mouse Th1 cells. This protein was cleaved by O-sialoglycoprotein endopeptidase and required sialic acid for E-selectin binding. The mAb 1B11, which recognizes the 130-kDa glycoform of CD43, recognized the 130-kDa band in the E-selectin-IgG precipitate. In addition, immunoprecipitation of the E-selectin-IgG precipitate with 1B11 depleted the 130-kDa protein, further confirming its identity as CD43. CD43 was also precipitated with E-selectin-IgG from cultured human T cells. E-selectin-dependent cell rolling on CD43 was observed under flow conditions using a CD43-IgG chimera generated in Chinese hamster ovary cells expressing alpha-1,3-fucosyltransferase VII and a core 2 beta-1,6-N-acetylglucosaminyltransferase. These results suggest that CD43, when modified by a specific set of glycosyltranferases, can function as an E-selectin ligand and therefore potentially mediate activated T cell migration into inflamed sites.
authors.affiliation: Laboratory of Immunodynamics, Department of Microbiology and Immunology, Osaka University Graduate School of Medicine, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Matsumoto
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Atarashi
authors.forename: Eiji
authors.initials: E
authors.lastname: Umemoto
authors.forename: Yuko
authors.initials: Y
authors.lastname: Furukawa
authors.forename: Akiko
authors.initials: A
authors.lastname: Shigeta
authors.forename: Masayuki
authors.initials: M
authors.lastname: Miyasaka
authors.forename: Takako
authors.initials: T
authors.lastname: Hirata
mesh_terms: D000818:Animals; D002634:Chemotaxis, Leukocyte; D019040:E-Selectin / Q000378:metabolism*; D016695:Glycosyltransferases / Q000378:metabolism; D006801:Humans; D036904:Leukocyte Rolling; D051917:Leukosialin / Q000378:metabolism* / Q000502:physiology*; D008024:Ligands; D008213:Lymphocyte Activation; D051379:Mice; D018345:Mice, Knockout; D011499:Protein Processing, Post-Translational; D013601:T-Lymphocytes / Q000378:metabolism* / Q000502:physiology
chemical_list: D019040:E-Selectin; D051917:Leukosialin; D008024:Ligands; D016695:Glycosyltransferases