title: Cell surface molecules involved in NK recognition by cloned cytotoxic T lymphocytes.
abstract: Short-term treatment of cloned mouse cytotoxic T lymphocytes (CTL) with interferon (IFN) induces lytic activity for natural killer- (NK) sensitive targets. Extended culture of CTL in high concentrations of interleukin 2 induces promiscuous lytic activity in which state both NK-sensitive and NK-resistant target cells are lysed. Cold-target competition analysis showed that the development of NK activity was associated with the acquisition of binding activity for NK-sensitive but not for NK-resistant targets, whereas the development of promiscuous lytic activity was associated with the acquisition of binding activity for both types of target. Antigen-specific cytolysis was inhibited by antibodies to Ly-2, Ly-5, LFA-1 and to the V region of the T cell antigen receptor (TCR), whereas NK and promiscuous lytic activity in the same cells was resistant to inhibition by anti-Ly-2 and anti-TCR. NK activity was expressed normally against a variant NK-sensitive cell line lacking all MHC antigens. These results show that, in contrast to antigen-specific recognition, the NK and promiscuous lytic activities of CTL are expressed without participation of effector cell Ly-2 and TCR molecules or target cell MHC molecules, and are most likely mediated through novel and distinct receptor systems.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000950:Antigens, Ly / Q000276:immunology; D000954:Antigens, Surface / Q000276:immunology*; D002999:Clone Cells / Q000276:immunology; D003602:Cytotoxicity, Immunologic; D006023:Glycoproteins / Q000276:immunology; D007111:Immunity, Cellular; D007113:Immunity, Innate; D007694:Killer Cells, Natural / Q000276:immunology*; D016169:Lymphocyte Function-Associated Antigen-1; D051379:Mice; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D011971:Receptors, Immunologic / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000950:Antigens, Ly; D000954:Antigens, Surface; D006023:Glycoproteins; D016169:Lymphocyte Function-Associated Antigen-1; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic