T lymphocyte responses to non-H-2 histocompatibility antigens. I. Role of Ly-1+2+ T cells as cytotoxic effectors and requirement for Ly-1+2+ T cells for optimal generation of cytotoxic effectors.
Cytotoxic effector T cells specific for non-H-2 histocompatibility (H) antigens were examined for phenotypic expression of lymphocyte differentiation (Ly) antigens. Virtually all H-Y-specific cytotoxic effectors generated in mixed lymphocyte culture were Ly-1+2+ T cells. H-3-specific effectors comprised both Ly-1+2+ and Ly-1-2+ T cells. However, cytotoxic effectors specific for multiple non-H-2 H antigens were predominantly Ly-1-2+ T cells. The optimal generation of H-Y- and H-3-specific effectors required Ly-1+2+ T cells; optimal generation of multiple non-H-2 H antigen-specific effectors required an interaction between Ly-1+2- and Ly-1-2+ T cells. These observations suggest that the identity of the target H antigen in part determines the Ly type of responsive T cells. Our observations suggest that 2 alternative pathways of T cell response exist for non-H-2 H antigens. The first pathway involves an interaction between Ly-1+2- helper T cells and Ly-1-2+ cytotoxic effector precursors. The 2nd pathway simply involves the response of Ly-1+2+ T cells proliferating and generating H antigen-specific cytotoxic effectors.
D000818:Animals; D000950:Antigens, Ly / Q000276:immunology*; D002454:Cell Differentiation; D003165:Complement System Proteins; D003602:Cytotoxicity, Immunologic; D000939:Epitopes; D006183:H-2 Antigens / Q000276:immunology; D006182:H-Y Antigen / Q000276:immunology; D006649:Histocompatibility Antigens; D007106:Immune Sera / Q000494:pharmacology; D051379:Mice; D008810:Mice, Inbred C57BL; D010641:Phenotype; D013601:T-Lymphocytes / Q000276:immunology*
D000950:Antigens, Ly; D000939:Epitopes; D006183:H-2 Antigens; D006182:H-Y Antigen; D006649:Histocompatibility Antigens; D007106:Immune Sera; D003165:Complement System Proteins