title: Participation of the H-2 antigens of tumor cells in their lysis by syngeneic T cells.
abstract: Cytotoxic T lymphocytes were generated in vitro against H-2 compatible or syngeneic tumor cells. In vitro cytotoxic activity was inhibited by specific anti-H2 sera, suggesting that H-2 antigens are involved in cell lysis. Two observations directly demonstrated the participation of the H-2 antigens on the tumor cells in their lysis by H-2-compatible T cells. First, coating of the H-2 antigens on the target tumor cell reduced the number of cells lysed on subsequent exposure to cytotoxic T cells. Second, when cytotoxic T cells were activated against an H-2 compatible tumor and assayed against an H-2-incompatible tumor, anti-H-2 serum that could bind to the target cell, but not to the cytotoxic lymphocyte, inhibited lysis. H-2 antigens were also shown to be present on the cytotoxic lymphocytes. Specific antisera reacting with these H-2 antigens, but not those of the target cell, failed to inhibit lysis when small numbers of effector cells were assayed against H-2-incompatible target cells or when effector cells of F1-hybrid origin and bearing two H-2 haplotypes were assayed against a tumor cell of one of the parental strains. These findings suggest that it is the H-2 antigens on the tumor cell and not those on the cytotoxic lymphocytes that are important in cell-mediated lysis of H-2-compatible tumor cells.
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm; D003601:Cytotoxicity Tests, Immunologic; D006680:HLA Antigens; D006649:Histocompatibility Antigens; D007106:Immune Sera; D008223:Lymphoma / Q000276:immunology*; D051379:Mice; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D014184:Transplantation, Homologous
chemical_list: D000951:Antigens, Neoplasm; D006680:HLA Antigens; D006649:Histocompatibility Antigens; D007106:Immune Sera