title: Induction of antigen-specific CD4- and CD8-mediated T-cell responses by fusions of autologous dendritic cells and metastatic colorectal cancer cells.
abstract: Human metastatic colorectal carcinomas (CRCAs) express carcinoembryonic antigen (CEA) and/or MUC1 tumor-associated antigens as potential targets for the induction of active specific immunity. In the present study, freshly isolated metastatic CRCA cells were successfully fused with immature autologous human monocyte-derived dendritic cells (DCs). The created heterokaryons (DC/CRCA) coexpress the CRCA-derived CEA and MUC1 antigens and DC-derived MHC class II and costimulatory molecules. The fusion cells were functional in stimulating the proliferation of autologous T cells. In addition, both CD4(+) and CD8(+) T cells were activated by fusion cells, as demonstrated by the production of high levels of IFN-gamma. More importantly, coculture of fusion cells with patient-derived peripheral blood mononuclear cells (PBMCs) resulted in the induction of antigen-specific cytotoxic T lymphocytes (CTLs). CTLs were effective at lysis of not only autologous CRCA cells but also the CEA and/or MUC1-positive and HLA partially matched target cells. Antigen-specific CTL responses were confirmed by tetrameric analysis. Coculture of PBMCs with fusion cells resulted in increased frequency of CEA- and MUC1-specific CTLs simultaneously. Taken together, these results indicate that freshly isolated human metastatic CRCA cells expressing the CEA and/or MUC1 may represent a potential partner for the creation of DC/tumor fusion cells targeting induction of antigen-specific CTL responses. Our report demonstrates the simultaneous induction of CRCA-specific CTL responses restricted by HLA-A2 and -A24.
authors.affiliation: Division of Gastroenterology and Hepatology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan. shigeo_koido@jikei.ac.jp
authors.forename: Shigeo
authors.initials: S
authors.lastname: Koido
authors.forename: Eiichi
authors.initials: E
authors.lastname: Hara
authors.forename: Akira
authors.initials: A
authors.lastname: Torii
authors.forename: Sadamu
authors.initials: S
authors.lastname: Homma
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Toyama
authors.forename: Hidejiro
authors.initials: H
authors.lastname: Kawahara
authors.forename: Masaichi
authors.initials: M
authors.lastname: Ogawa
authors.forename: Michiaki
authors.initials: M
authors.lastname: Watanabe
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Yanaga
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Fujise
authors.forename: Jianlin
authors.initials: J
authors.lastname: Gong
authors.forename: Gotaro
authors.initials: G
authors.lastname: Toda
mesh_terms: D000368:Aged; D015704:CD4 Antigens / Q000276:immunology*; D016827:CD8 Antigens / Q000276:immunology*; D002272:Carcinoembryonic Antigen / Q000276:immunology; D002459:Cell Fusion; D045744:Cell Line, Tumor; D015179:Colorectal Neoplasms / Q000276:immunology* / Q000473:pathology; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology*; D005260:Female; D006801:Humans; D008213:Lymphocyte Activation; D008297:Male; D008875:Middle Aged; D018396:Mucin-1 / Q000276:immunology; D009362:Neoplasm Metastasis; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D015704:CD4 Antigens; D016827:CD8 Antigens; D002272:Carcinoembryonic Antigen; D018396:Mucin-1