title: Primary and secondary in vitro generation of cytolytic T lymphocytes in the murine sarcoma virus system.
abstract: Cell-mediated cytotoxic responses in vitro to surface antigens associated with murine sarcoma virus (MSV)-induced tumors were investigated using mixed leukocyte-tumor cell cultures (MLTC). The source of responding cells was either spleens from normal C57BL/6 mice (primary MLTC) or spleens of C57BL/6 mice carrying or having rejected a MSV-induced tumor (secondary MLTC). Graffi virus-induced GiL-4 leukemia cells, Rauscher virus-induced RB1-5 leukemia cells, and MSV-induced MSV-B16 sarcoma cells were used as stimulating syngeneic tumor cells and/or target cells. Under appropriate culture conditions, cytolytic T lymphocytes (CTL) were generated in both primary and secondary MLTC. As assessed by a quantitative short-term 51Cr release assay system, CTL activity in secondary MLTC populations was at least 10-fold higher than that in primary MLTC populations, and 100-fold higher than that in spleen cells taken at the peak of the in vivo response of MSV-infected mice. The ability of spleen cells to mount a secondary CTL response in vitro could be observed as early as 5 days after virus injection, increased up to the time of maximum tumor size and persisted long after tumor regression. This suggests the development of increased numbers of CTL progenitors and/or the formation of "memory" CTL in spleens of MSV-injected mice.
mesh_terms: D000818:Animals; D003429:Cross Reactions; D004306:Dose-Response Relationship, Immunologic; D005260:Female; D007111:Immunity, Cellular; D007156:Immunologic Memory; D007700:Kinetics; D009052:Leukemia Virus, Murine / Q000276:immunology; D007959:Lymphocyte Culture Test, Mixed; D008223:Lymphoma / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D008979:Moloney murine leukemia virus / Q000276:immunology*; D009374:Neoplasms, Experimental / Q000276:immunology; D011925:Rauscher Virus / Q000276:immunology; D012513:Sarcoma, Experimental / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*