title: Native anti-tumor responses elicited by immunization with a low dose of unmodified live tumor cells.
abstract: The present study demonstrates that immunization with a low dose of unmodified live myeloma tumor cells (FO) elicited tumor-specific immunity. BALB/c mice were vaccinated with 10(4) live dendritic cells (DC)-FO fusion cells or 10(3) live FO cells. 80% of vaccinated mice survived from the later challenge with 1 x 10(6) FO cells, whereas all control mice developed tumors. Additionally, vaccination with live FO cells gave no protection against the growth of Lewis lung carcinoma cells in C57BL/6 mice. Cellular immunity was found to be primarily responsible for anti-tumor responses. In an adoptive immune model, the development of myeloma was greatly reduced by transfusion of lymphocytes but not sera from mice immunized with FO. T cells from immunized mice also induced lysis of FO cells in the cytotoxic T lymphocyte (CTL) assay. After co-culture with FO, IFN-gamma released from immunized T helper cells increased >10-fold, while IL-4 remained unchanged in comparison with control T cells. These findings provided the first evidence that immunization with a low dose of unmodified live FO cells was safe to mice and capable of eliciting specific protective immunity against tumor growth.
authors.affiliation: Institute of Molecular Medicine and State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, PR China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Wu
authors.forename: Shi-Quan
authors.initials: SQ
authors.lastname: Wang
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.forename: Xiang-Yang
authors.initials: XY
authors.lastname: Tan
authors.forename: Jian-Ning
authors.initials: JN
authors.lastname: Liu
mesh_terms: D000818:Animals; D019496:Cancer Vaccines / Q000008:administration & dosage / Q000276:immunology*; D045744:Cell Line, Tumor; D003601:Cytotoxicity Tests, Immunologic; D003602:Cytotoxicity, Immunologic / Q000276:immunology; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology / Q000637:transplantation; D004305:Dose-Response Relationship, Drug; D005260:Female; D006822:Hybrid Cells / Q000276:immunology / Q000637:transplantation; D016219:Immunotherapy, Adoptive / Q000379:methods*; D007371:Interferon-gamma / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D009101:Multiple Myeloma / Q000276:immunology / Q000473:pathology; D009374:Neoplasms, Experimental / Q000276:immunology / Q000378:metabolism / Q000628:therapy*; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism; D014182:Transplantation, Autologous
chemical_list: D019496:Cancer Vaccines; D007371:Interferon-gamma