title: CC-chemokine ligand 17 gene therapy induces tumor regression through augmentation of tumor-infiltrating immune cells in a murine model of preexisting CT26 colon carcinoma.
abstract: Chemokines, which regulate leukocyte trafficking and infiltration of local sites, are attractive candidates for improving the efficacy of cancer immunotherapy by enhancing the accumulation of immune cells in tumor tissue. Herein, we evaluated the antitumor effects of intratumoral injection of RGD fiber-mutant adenoviral vectors (AdRGDs) encoding the chemokines CCL17, CCL19, CCL20, CCL21, CCL22, CCL27, XCL1 or CX3CL1 in a murine model of preexisting CT26 colon carcinoma. Among these 8 chemokine-expressing AdRGDs, injection of AdRGD-CCL17 most effectively induced tumor regression and generated specific immunity in rechallenge experiments. Tumor elimination activity by intratumoral injection of AdRGD-CCL17 depended on both the vector dose and the number of injections, and mainly required CD8+ CTLs in an effector phase as confirmed by analysis using BALB/c nude mice and an in vivo depletion assay. In addition, CCL17 gene transduction induced significant increases in the number of infiltrating macrophages and CD8+ T cells in CT26 tumors, and changed the tumor microenvironment to an immunologic activation state in which there was enhanced expression of lymphocyte activation markers and cell adhesion molecules. Thus, our data provide evidence that CCL17 gene transduction of local tumor sites is a promising approach for the development of a cancer immunogene therapy that can recruit activated tumor-infiltrating immune effector cells.
authors.affiliation: Department of Biotechnology and Therapeutics, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka, Japan.
authors.forename: Naoko
authors.initials: N
authors.lastname: Kanagawa
authors.affiliation: Department of Biopharmaceutics, Kyoto Pharmaceutical University, 5 Nakauchi-cho, Misasagi, Yamashina-ku, Kyoto, Japan.
authors.forename: Masakazu
authors.initials: M
authors.lastname: Niwa
authors.affiliation: Department of Biomedical Science, Dako Japan Co. Ltd., Nishinotouin-higashiiru, Shijo-dori, Shimogyo-ku, Kyoto, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Hatanaka
authors.affiliation: Department of Biomedical Science, Dako Japan Co. Ltd., Nishinotouin-higashiiru, Shijo-dori, Shimogyo-ku, Kyoto, Japan.
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Tani
authors.affiliation: Department of Biotechnology and Therapeutics, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka, Japan.
authors.forename: Shinsaku
authors.initials: S
authors.lastname: Nakagawa
authors.affiliation: Department of Biopharmaceutics, Kyoto Pharmaceutical University, 5 Nakauchi-cho, Misasagi, Yamashina-ku, Kyoto, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Fujita
authors.affiliation: Department of Biopharmaceutics, Kyoto Pharmaceutical University, 5 Nakauchi-cho, Misasagi, Yamashina-ku, Kyoto, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Yamamoto
authors.affiliation: Department of Biotechnology and Therapeutics, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka, Japan.|Department of Biopharmaceutics, Kyoto Pharmaceutical University, 5 Nakauchi-cho, Misasagi, Yamashina-ku, Kyoto, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Okada
mesh_terms: D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D045744:Cell Line, Tumor; D054414:Chemokine CCL17 / Q000235:genetics / Q000378:metabolism*; D003110:Colonic Neoplasms / Q000276:immunology / Q000378:metabolism* / Q000473:pathology / Q000628:therapy*; D004195:Disease Models, Animal; D015972:Gene Expression Regulation, Neoplastic; D015316:Genetic Therapy; D005822:Genetic Vectors / Q000235:genetics; D006801:Humans; D008213:Lymphocyte Activation / Q000276:immunology; D016246:Lymphocytes, Tumor-Infiltrating / Q000276:immunology* / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009368:Neoplasm Transplantation
chemical_list: C499538:Ccl17 protein, mouse; D054414:Chemokine CCL17