title: Intercellular exchange of class II major histocompatibility complex/peptide complexes is a conserved process that requires activation of T cells but is constitutive in other types of antigen presenting cell.
abstract: Activated T cells acquire antigen presenting cell- (APC) derived class II major histocompatibility complex glycoproteins (MHCII) but the role of TCR in this process is controversial. This study provides additional evidence that ligation of TCR initiates activation-dependent processes that independently mediate acquisition of APC-derived molecules. First, intercellular exchange of MHCII resulted in the constitutive accumulation of xenogeneic rat I-A on murine B cells, whereas naïve murine T cells required activation to adsorb xenogeneic I-A. Likewise, continuous lines of B cells, basophils, and MØ from various species such as rat, mouse, and human constitutively acquired xenogeneic I-A. Second, inhibitors of T-cell activation such as wortmannin, EGTA, or mAb against I-A, TCR, LFA-1, or CD4 inhibited I-A acquisition by rested T cells but not by preactivated T cells. In conclusion, exchange of MHCII is a conserved process that requires activation of T cells but is constitutive in other types of APC.
authors.affiliation: The Department of Microbiology and Immunology, East Carolina University School of Medicine, Greenville, North Carolina 27858-4354, USA.
authors.forename: D M
authors.initials: DM
authors.lastname: Patel
authors.forename: M D
authors.initials: MD
authors.lastname: Mannie
mesh_terms: D000730:Androstadienes / Q000494:pharmacology; D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D000938:Antigen-Presenting Cells / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology; D001491:Basophils / Q000276:immunology; D015815:Cell Adhesion Molecules / Q000276:immunology; D002461:Cell Line, Transformed / Q000276:immunology; D002999:Clone Cells / Q000276:immunology; D004533:Egtazic Acid / Q000494:pharmacology; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006801:Humans; D007108:Immune Tolerance / Q000276:immunology; D019169:Jurkat Cells / Q000276:immunology; D008213:Lymphocyte Activation / Q000276:immunology*; D016169:Lymphocyte Function-Associated Antigen-1 / Q000276:immunology; D008264:Macrophages / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D009928:Organ Specificity; D051381:Rats; D011917:Rats, Inbred Lew; D011948:Receptors, Antigen, T-Cell / Q000276:immunology*; D013045:Species Specificity; D013154:Spleen / Q000166:cytology / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D014407:Tumor Cells, Cultured / Q000276:immunology; D000077191:Wortmannin
chemical_list: D000730:Androstadienes; D000911:Antibodies, Monoclonal; D015815:Cell Adhesion Molecules; D000949:Histocompatibility Antigens Class II; D016169:Lymphocyte Function-Associated Antigen-1; D011948:Receptors, Antigen, T-Cell; D004533:Egtazic Acid; D000077191:Wortmannin