title: Different responses of lymphoid cells from tumor-bearing as compared to tumor-immunized mice when sensitized to tumor specific antigens in vitro.
abstract: Lymphoid cells from spleen and lymph nodes of BALB/c mice were sensitized in vitro by cocultivation with cells from syngeneic methylcholanthrene-induced sarcomas. The donor mice were either immunized in vivo by tumor transplantation followed by excision ("tumor-excised mice") or were carrying a progressively growing tumor ("tumor-bearing mice"). The cell-mediated immune response of the sensitized cells was compared by a 36-hr microcytotoxicity assay. Lymphoid cells from tumor-excised mice were cytotoxic when tested after 3 days and also after 6 days of sensitization in vitro. Lymphoid cells from tumor-bearing mice were cytotoxic to cells of the tumor borne when tested after 3 days in culture. However, the cytotoxic effect was lost after 6 days of contact with the sensitizing tumor in vitro. Preliminary data suggest that the cultured lymphoid cells of tumor-bearing mice which have lost cytotoxicity, can suppress the reactivity of in vitro sensitized lymphoid cells from tumor-excised mice.
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000008:administration & dosage*; D001402:B-Lymphocytes / Q000276:immunology; D002460:Cell Line; D007114:Immunization; D051379:Mice; D008807:Mice, Inbred BALB C / Q000276:immunology*; D012513:Sarcoma, Experimental / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000951:Antigens, Neoplasm