title: Generation and functional assessment of antigen-specific T cells stimulated by fusions of dendritic cells and allogeneic breast cancer cells.
abstract: We have reported that fusions of patient-derived dendritic cells (DC) and autologous breast cancer cells induce T-cell responses against autologous tumors. However, the preparation of fusion cells requires patient-derived tumor cells, and these are not always available in the clinical setting. In the present study, we explore an alternative approach to constructing DC-breast cancer fusion vaccine by using breast cancer-cell lines. DC generated from HLA-A*0201-positive donor were fused to HLA-A*0201+ allogeneic MCF7 breast cancer cells. These fusion cells co-expressed tumor-associated antigens and DC-derived costimulatory and MHC molecules. Both CD4 and CD8 T cells were activated by the fusion cells as demonstrated by the production of IFN-gamma. The fusion cells induced strong antigen-specific cytotoxic T lymphocytes (CTL) activity against their parent cells. The lysis of targets was restricted by HLA-A*0201, since killing was blocked by the anti-HLA-A2 mAb. Similar CTL activity against HLA-A*0201-positive targets was induced when T cells were cocultured with fusions of DC and HLA-A*0201-negative allogeneic BT20 breast cancer cells. In addition, administration of T cells stimulated by DC-breast cancer fusion cells regressed 7-day-old tumors and rendered mice free of disease up to 90 days. These results suggest that tumor-cell lines can be used as a fusion partner in the construction of DC-tumor fusion vaccine. Such fusion cells hold promise since they can be used as a vaccine for active immunotherapy or as stimulators to activate and expand T cells for adoptive immunotherapy.
authors.affiliation: Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Shigeo
authors.initials: S
authors.lastname: Koido
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Hisao
authors.initials: H
authors.lastname: Tajiri
authors.forename: Jianlin
authors.initials: J
authors.lastname: Gong
mesh_terms: D000818:Animals; D001943:Breast Neoplasms / Q000276:immunology*; D019496:Cancer Vaccines / Q000276:immunology*; D002459:Cell Fusion; D045744:Cell Line, Tumor; D003713:Dendritic Cells / Q000276:immunology*; D005260:Female; D015234:HLA-A Antigens / Q000032:analysis; D006684:HLA-DR Antigens / Q000032:analysis; D006801:Humans; D016219:Immunotherapy, Adoptive / Q000379:methods*; D007371:Interferon-gamma / Q000096:biosynthesis; D008213:Lymphocyte Activation; D051379:Mice; D016513:Mice, SCID; D013601:T-Lymphocytes / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology
chemical_list: D019496:Cancer Vaccines; D015234:HLA-A Antigens; D006684:HLA-DR Antigens; D007371:Interferon-gamma