title: Optimal amount of monocyte chemoattractant protein-1 enhances antitumor effects of suicide gene therapy against hepatocellular carcinoma by M1 macrophage activation.
abstract: Suicide gene therapy combined with chemokines provides significant antitumor efficacy. Coexpression of suicide gene and monocyte chemoattractant protein-1 (MCP-1) increases antitumor effects in murine models of hepatocellular carcinoma (HCC) and colon cancer. However, it is unclear whether the doses administered achieved the maximum antitumor effects. We evaluated antitumor effects of various amounts of recombinant adenovirus vector (rAd) expressing MCP-1 in the presence of a suicide gene in a murine model of HCC. HCC cells were transplanted subcutaneously into BALB/c nude mice, and transduced with a fixed amount of Ad-tk harboring the suicide gene, HSV-tk, and various doses of Ad-MCP1 harboring MCP-1 (ratios of 1:1, 0.1:1, and 0.01:1 relative to Ad-tk). Growth of primary tumors was suppressed when treated with Ad-tk plus Ad-MCP1 (1:1 and 1:0.1) as compared with Ad-tk alone. The antitumor effects against tumor rechallenge tended to be high in the Ad-tk plus Ad-MCP1 group (1:0.1). The effects were dependent on production of Th1 type-cytokines. Delivery of an optimal amount of rAd expressing MCP-1 enhanced the antitumor effects of suicide gene therapy against HCC by M1 macrophage activation, suggesting that this is a plausible form of cancer gene therapy to prevent HCC progression and recurrence.
authors.affiliation: Disease Control and Homeostasis, Graduate School of Medical Science, Kanazawa University, Kanazawa, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Tsuchiyama
authors.forename: Yasunari
authors.initials: Y
authors.lastname: Nakamoto
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Sakai
authors.forename: Naofumi
authors.initials: N
authors.lastname: Mukaida
authors.forename: Shuichi
authors.initials: S
authors.lastname: Kaneko
mesh_terms: D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D006528:Carcinoma, Hepatocellular / Q000235:genetics / Q000628:therapy*; D045744:Cell Line, Tumor; D018932:Chemokine CCL2 / Q000235:genetics*; D004195:Disease Models, Animal; D004797:Enzyme-Linked Immunosorbent Assay; D041722:Genes, Transgenic, Suicide / Q000235:genetics; D015316:Genetic Therapy / Q000379:methods*; D005822:Genetic Vectors; D006801:Humans; D007150:Immunohistochemistry; D008114:Liver Neoplasms, Experimental / Q000235:genetics / Q000628:therapy*; D008262:Macrophage Activation / Q000235:genetics*; D017737:Macrophages, Peritoneal / Q000276:immunology; D008297:Male; D051379:Mice; D008819:Mice, Nude; D023041:Xenograft Model Antitumor Assays
chemical_list: D018932:Chemokine CCL2