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Dendritic cells pulsed with α‐fetoprotein and mutant P53 fused gene induce bi‐targeted cytotoxic T lymphocyte response against hepatic carcinoma

Dendritic cell (DC)‐based immunotherapy is rapidly emerging as a promising treatment in cancer therapy. We had previously shown that DC pulsed with either defined mRNA of tumor antigen (Ag) such as α‐fetoprotein (AFP), or total RNA of hepatocellular carcinoma (HCC) could elicit Ag‐specific cytotoxic T lymphocyte (CTL) response. Therefore, we suggested a novel DC‐based therapeutic method, in which DCs derived from CD34+ cells enriched peripheral blood mononuclear cells were pulsed with liposome‐coated AFP and mutant P53 (mtP53) fused gene pEGFP‐C3/AFP‐mtP53 to induce bi‐targeted specific CTL responses against HCC. Three different genotype HCC cell lines, HepG2 (human histocompatibility leukocyte antigens (HLA) A2 positive, AFP expressing positive, P53 expressing negative), SMMC7721 (HLA A2 positive, neither AFP nor P53 expressing positive), and HMCC97 (HLA A2 positive, both AFP and P53 expressing positive) were selected as targets for CTL responses. An important finding was that DCs pulsed with the liposome‐coated fused gene could evoke more intensive bi‐targeted Ag‐specific CTL responses against HMCC97 than DCs pulsed with either AFP or P53 single gene (P < 0.05). This experimental therapeutic model provides a new promising cytotherapeutic approach, in that DCs pulsed with the fused gene of different Ags might induce more extensive multitargeted antitumor immunity. (Cancer Sci 2008; 99: 1420–1426)