Summary
DBA/2 mice were immunized i.p. against syngeneic SL2 lymphosarcoma cells. At various days after the last immunization peritoneal and spleen lymphocytes were collected. The lymphocyte suspensions were enriched for T-cells by nylon wool filtration.
The peritoneal T-cells from immunized mice (a) expressed direct specific antitumor cytotoxicity in vitro, (b) induced macrophage cytotoxicity in vitro, and (c) exerted tumor neutralization measured in a Winn-type assay. Spleen T-cells from these immunized mice (a) expressed no direct specific antitumor cytotoxicity in vitro, (b) only induced moderate macrophage cytotoxicity in vitro, but (c) exerted tumor neutralization in a Winn assay.
For effective tumor neutralization in vivo effector target cell ratios of 1000:1 were required. When the effector/target ratio of 1000:1 was maintained but the absolute numbers of effector and target cells were lowered from 106 to 105 lymphocytes and 103 to 102 target cells respectively, no tumor neutralization was obtained.
The major effect of the sensitized-transferred T-lymphocytes seemed to be the induction of cytotoxic macrophages in the (naive) recipient mice, as the peritoneal macrophages collected from the recipient mice 7 days after i.p. injection of a mixture of sensitized T-cells and tumor cells were cytotoxic. Purified peritoneal T-lymphocytes collected from these recipient mice were able to induce macrophage cytotoxicity in vitro but expressed no cytotoxic T-cell activity.
In conclusion, our results show that in the tumor system used, tumor neutralization after transfer of sensitized lymphocytes is not dependent on the presence of cytotoxic T-lymphocytes. Lymphocytes with the strongest potency to render macrophages cytotoxic (in vitro and in vivo) also induce the best tumor neutralization in vivo, suggesting an important role for host macrophages as antitumor effector cells.
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Dullens, H.F.J., Vuist, W., Van der Maas, M. et al. The role of host lymphocytes and host macrophages in antitumor reactions after injection of sensitized lymphocytes and tumor target cells into naive mice. Cancer Immunol Immunother 23, 113–118 (1986). https://doi.org/10.1007/BF00199816
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DOI: https://doi.org/10.1007/BF00199816