title: Regulation of the immune response to tumor antigens. IX. In vitro Lyt-1+2- cell proliferative responses to cellbound or subcellular tumor antigen.
abstract: We investigated the cellular basis of immune reactivity to the S1509a fibrosarcoma in tumor-immune A/J mice. In a Winn assay, immune Lyt-1+2- T cells are capable of retarding S1509a tumor growth in naive A/J mice. In vitro proliferation to S1509a is also mediated by tumor-immune Lyt-1+2- T cells. This response is specific to the immunizing tumor and appears 5 to 7 days after reexposure to the tumor in vivo. Proliferation also requires the presence of a population of adherent cells. In fact, adherent peritoneal exudate cells pulsed with tumor membrane fragments derived from S1509a cells can stimulate proliferation. Proliferation is blocked by the addition of anti-I-Ak monoclonal antibody to the culture medium without complement or by treatment of the responder population with anti-I-Ak and complement. In vitro responsiveness is also inhibited by the presence of tumor-specific suppressor T cells in vivo. These observations suggest in vitro proliferation may provide a potential means of defining tumor antigens and cell-surface structures involved in tumor immunity.
mesh_terms: D000818:Animals; D000950:Antigens, Ly / Q000276:immunology; D000951:Antigens, Neoplasm / Q000276:immunology*; D002448:Cell Adhesion; D000939:Epitopes; D005260:Female; D005354:Fibrosarcoma / Q000276:immunology; D007111:Immunity, Cellular; D007700:Kinetics; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology; D008213:Lymphocyte Activation; D008223:Lymphoma / Q000276:immunology; D051379:Mice; D008805:Mice, Inbred A; D009368:Neoplasm Transplantation; D010641:Phenotype; D013601:T-Lymphocytes / Q000276:immunology* / Q000637:transplantation; D050378:T-Lymphocytes, Regulatory / Q000276:immunology
chemical_list: D000950:Antigens, Ly; D000951:Antigens, Neoplasm; D000939:Epitopes