Hybrid-primed lymphocytes and hybrid vaccination prevent tumor growth of lewis lung carcinoma in mice.
Dendritic cell (DC)-tumor cell hybrids are currently being evaluated as a novel antitumor vaccination strategy. We have explored in an animal model whether administration of DCs fused with poorly immunogenic carcinoma cells could elicit an antitumor response. Fusion of C57/BL6 mice bone marrow-derived DCs with Lewis lung carcinoma (LLC1) cells resulted in approximately 50% fusion efficiency. Hybrid cells (HCs) were used to explore 3 potential tumor therapy strategies: protective immunization, vaccination, and adoptive cellular therapy. Immunization with HCs induced activation of proliferating cytotoxic T cells, upregulation of distinct cytokines genes, and a significant retardation of tumor growth. Similar results were observed by vaccination with HCs in the tumor-bearing host. Finally, when T cells from HC-vaccinated mice were transferred into naive tumor-bearing mice, tumor growth was strongly retarded and an efficient proliferative and cytotoxic T-cell response was observed. Tumor growth was reduced by more than 50%, and tumor development was significantly delayed. Taken together, we demonstrate that HCs offer effective immunotherapy of poorly immunogenic carcinomas. This is independent of whether the HCs are taken for adoptive transfer or as a vaccine.
Department of Hematology and Oncology, Medical Center University of Giessen, Giessen, Germany.
Rajkumar
R
Savai
Ralph Theo
RT
Schermuly
Michael
M
Schneider
Soni Savai
SS
Pullamsetti
Friedrich
F
Grimminger
Werner
W
Seeger
Gamal-Andre
GA
Banat
D019264:Adoptive Transfer; D000818:Animals; D017951:Antigen Presentation / Q000276:immunology; D000951:Antigens, Neoplasm / Q000276:immunology; D019496:Cancer Vaccines; D018827:Carcinoma, Lewis Lung / Q000276:immunology* / Q000473:pathology / Q000517:prevention & control*; D002459:Cell Fusion; D003713:Dendritic Cells / Q000276:immunology* / Q000473:pathology; D006822:Hybrid Cells / Q000276:immunology; D007111:Immunity, Cellular; D008213:Lymphocyte Activation; D051379:Mice; D016176:T-Lymphocyte Subsets / Q000276:immunology
D000951:Antigens, Neoplasm; D019496:Cancer Vaccines