title: Alloimmune cytotoxic T cells: Evidence that they recognize serologically defined antigens and bear clonally restricted receptors.
abstract: Murine  T cells immunized with allogeneic cells exert a cytotoxic effect on appropriate target cells, as measured by 51-Cr release. Lysis of the 51-Cr-labeled target can be inhibited by addition to the assay of unlabeled cells which bear target antigens. With variants of lymphoid tumors which express different amounts of serologically defined H-2 antigens as competitors in the assay, a positive correlation is shown to exist between the amount of serologically defined antigen and the degree of inhibition of T cell-mediated lysis. The immunized small lymphocytes are shown to be very poor inhibitors of 51-Cr release from target cells which are more susceptible to T cell-mediated lysis. This is interpreted as showing that small lymphocytes are bound very poorly by cytotoxic T cells. With H-2 cross-over strains which carry only the H-2K or H-2D antigens which a cytotoxic population is directed against, it is shown that, 1) approximately equal amounts of cytotoxicity are directed against the K and D antigens, and 2) separate cytotoxic T cells recognize the K and D antigens. Thus, by this criterion, cytotoxic T cells are monospecific and therefore do not acquire their antigen-specific receptors cytophilically.
mesh_terms: D000818:Animals; D000937:Antigen-Antibody Reactions; D001666:Binding Sites, Antibody; D001667:Binding, Competitive; D002860:Chromium Radioisotopes; D003601:Cytotoxicity Tests, Immunologic; D005838:Genotype; D006649:Histocompatibility Antigens; D008198:Lymph Nodes / Q000166:cytology; D007959:Lymphocyte Culture Test, Mixed; D008223:Lymphoma / Q000276:immunology; D012515:Mast-Cell Sarcoma / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D009101:Multiple Myeloma / Q000276:immunology; D009374:Neoplasms, Experimental / Q000276:immunology; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D002860:Chromium Radioisotopes; D006649:Histocompatibility Antigens