Cell-mediated immunity to friend virus-induced leukemia. IV. In vitro generation of primary and secondary cell-mediated cytotoxic responses
- PMID: 58034
Cell-mediated immunity to friend virus-induced leukemia. IV. In vitro generation of primary and secondary cell-mediated cytotoxic responses
Abstract
Primary and secondary cell-mediated cytotoxic responses to FBL-3 cells, a syngeneic Friend virus-induced leukemia in C57BL/6 mice, could be generated by in vitro techniques as tested by the 125IUdR release assay. The specificity of the cytotoxic reactions appeared to be directed against the Friend type-specific antigen and the FMR (Friend, Moloney, Rauscher) antigen which were also the major antigens for transplantation immunity to FBL-3. In comparison to the primary cytotoxic response, the secondary cytotoxic response was accelerated (detected at an earlier time after sensitization), enhanced (gave much higher levels of cytotoxicity), was also longer lasting, and could be induced by a wide dose range of tumor cells. The secondary response could only be induced with lymphocytes obtained from regressors that were resistant to FBL-3 challenge; lymphocytes from mice with progressive tumor growth had no detectable secondary response. It was found that both induction phase and the effector phase of cytotoxic responses were T cell dependent. The characteristics of these reactions were thus very similar to those obtained with in vivo immunization or challenge, providing a good correlation with in vivo tumor immunity.
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