In this study we have analyzed the in vitro cell-mediated cytotoxicity of immune peritoneal exudate cells (PEC), elicited in syngeneic mice against the MCA-induced, TSTA-bearing BALB/c fibrosarcomas CA-2, GI-17 and C-3. The 4 h 51Cr-release assay showed the immune PEC effectors to be specifically cytotoxic to fibrosarcoma used for the immunization, but not to other syngeneic MCA-induced tumors or normal fibroblasts. Cold target inhibition experiments on CA-2 cells confirmed the specificity of the reaction. When PEC, lymph-node and spleen cells from BALB/c anti-CA-2 mice were compared for anti-tumor activity, only PEC were found to kill tumor cells significantly. PEC effectors did not have a significant level of NK or NC activities since they were unable to destroy YAC-I target and the PEC-mediated anti-tumor activity was not inhibited by unlabelled YAC-1 or WEHI-164 tumor cells. PEC anti-CA-2 were analyzed for the expression of T-cell markers by anti-Thy 1.2, anti-Ly 1.2 and Ly 2.2 monoclonal antibodies. Anti-tumor specific effector cells were identified as mature T cells since they were not adherent to plastic and showed Thy 1.2 +, Ly 1.2 - and Ly 2.2 + phenotypes. In addition, anti-H-2K(d) but not anti-H-2D(d) alloantiserum added to target cells, blocked CA-2 tumor lysis, thus supporting the conclusion that the T-cell response against TSTA is H-2 restricted.
|Number of pages||7|
|Journal||International Journal of Cancer|
|Publication status||Published - 1983|
ASJC Scopus subject areas
- Cancer Research