title: Clonal specificity analysis of mitogen-activated murine T lymphoblasts.
abstract: We have determined the frequencies and specificities of MHC-reactive and MHC-restricted cytotoxic T lymphocyte precursors (CTL-p) in mitogen (ConA)-activated splenocytes of normal unprimed mice. The limiting dilution (LD) system supported the growth of one out of three Lyt2+ T cell blasts. The generated CTL-populations lysed blast cell targets specifically as determined by split well analyses. MHC-gene product expression was necessary for lysis to occur, since MHC-negative F9 teratocarcinoma cells were not lysed. The frequency determinations and split well analyses revealed: 1) equally high numbers (approximately 1/100) of CTL-p that generated specific allo-MHC or self-MHC reactive CTL populations, 2) high frequencies of CTL-p which recognized hapten (TNP) or minor H (MH)-antigens in the context of self MHC or allo-MHC determinants. The results are discussed with respect to antigen, restriction and receptor specificities of mitogen-activated unprimed T cell blasts.
mesh_terms: D000818:Animals; D001324:Autoantigens / Q000276:immunology; D002999:Clone Cells / Q000276:immunology; D003208:Concanavalin A / Q000494:pharmacology; D006412:Hematopoietic Stem Cells / Q000276:immunology; D006649:Histocompatibility Antigens; D066298:In Vitro Techniques; D007519:Isoantigens / Q000276:immunology; D008213:Lymphocyte Activation; D051379:Mice; D008815:Mice, Inbred Strains; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*
chemical_list: D001324:Autoantigens; D006649:Histocompatibility Antigens; D007519:Isoantigens; D003208:Concanavalin A