title: Functional subclasses of T lymphocytes bearing different Ly antigens. II. Cooperation between subclasses of Ly+ cells in the generation of killer activity.
abstract: Lymphocytes from BALB/c or C57B6/6 mice that develop killer activity to alloantigens belong to the numerically small Ly-23 subclass of peripheral T cells, distinguished by selective expression of Ly-23 determinants on their surfaces. The maturation of these cells to killer cells can be amplified by Ly-1+ cells, which do not themselves contribute to the killer cell pool. This amplification was abolished by escluding Ia("Beta")+ cells from the stimulator population during mixed lymphocyte culture (MCL), suggesting that amplification is due to selective recognition of I region antigens by L-1+ cells, a conclusion already drawn from our previous evidence that Ia differences activate Ly-1+ cells but not Ly-23+ cells. These and other experiments indicate that amplification of killer cell production in vitro by Ly-1+ cells is not due to their conversion to Ly-23+ cells during MLC, but to their ability to recognize major histocompatibility complex determinants not recognized by Ly-23+ cells.
mesh_terms: D000818:Animals; D003601:Cytotoxicity Tests, Immunologic; D006462:Hemolytic Plaque Technique; D006648:Histocompatibility; D007111:Immunity, Cellular; D007125:Immunogenetics; D007519:Isoantigens; D008198:Lymph Nodes / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008815:Mice, Inbred Strains; D013601:T-Lymphocytes / Q000276:immunology*; D013997:Time Factors
chemical_list: D007519:Isoantigens