title: Monoclonal cytotoxic T lymphocyte hybridomas capable of specific killing activity, antigenic responsiveness, and inducible interleukin secretion.
abstract: We have recently described the production of cytotoxic T lymphocyte (CTL) hybridomas that grow continuously in culture, exhibiting constitutive, allospecific (anti-H-2b) killing activity. We now report on the response of these monoclonal CTL hybridomas to specific antigen (H-2Db) and to mitogenic lectins. Both specific antigen and T cell mitogens enhance hybridoma-mediated specific target cell killing. In addition, stimulated, but not unstimulated hybridoma cells secrete considerable amounts of IL 2 into the culture medium. Repeated cloning of the hybridomas provides strong evidence that both killing activity and IL 2 secretion can be attributed to one cell. Unfractionated Con A supernatants, containing IL 2 and other factors known to influence T cell responsiveness, or IL 2-containing media of stimulated hybridomas affect neither the growth nor the lytic activity of the hybridomas. Anti-LFA-1 monoclonal antibody, a potent inhibitor of CTL and CTL hybridoma-mediated target cell lysis, abolishes antigen- or mitogen-induced IL 2 secretion by the CTL hybridomas. Involvement of a single hybridoma receptor in antigen recognition (afferent and efferent) and in initiating IL 2 secretion is proposed. The CTL hybridomas displaying retarded killing activity before the antigenic or mitogenic stimulation appear to represent an intermediate stage in CTL differentiation, reminiscent of "memory" CTL.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000502:physiology*; D003208:Concanavalin A / Q000494:pharmacology; D003470:Culture Media; D003602:Cytotoxicity, Immunologic; D000939:Epitopes; D006183:H-2 Antigens / Q000276:immunology; D006825:Hybridomas / Q000276:immunology*; D007108:Immune Tolerance; D007156:Immunologic Memory; D007376:Interleukin-2 / Q000096:biosynthesis / Q000502:physiology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D003470:Culture Media; D000939:Epitopes; D006183:H-2 Antigens; D007376:Interleukin-2; D003208:Concanavalin A