title: Co-expression of interleukin 12 enhances antitumor effects of a novel chimeric promoter-mediated suicide gene therapy in an immunocompetent mouse model.
abstract: The human telomerase reverse transcriptase (hTERT) promoter has been widely used in target gene therapy of cancer. However, low transcriptional activity limited its clinical application. Here, we designed a novel dual radiation-inducible and tumor-specific promoter system consisting of CArG elements and the hTERT promoter, resulting in increased expression of reporter genes after gamma-irradiation. Therapeutic and side effects of adenovirus-mediated horseradish peroxidase (HRP)/indole-3-acetic (IAA) system downstream of the chimeric promoter were evaluated in mice bearing Lewis lung carcinoma, combining with or without adenovirus-mediated interleukin 12 (IL12) gene driven by the cytomegalovirus promoter. The combination treatment showed more effective suppression of tumor growth than those with single agent alone, being associated with pronounced intratumoral T-lymphocyte infiltration and minor side effects. Our results suggest that the combination treatment with HRP/IAA system driven by the novel chimeric promoter and the co-expression of IL12 might be an effective and safe target gene therapy strategy of cancer.
authors.affiliation: Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan, PR China. xuyu1001@gmail.com
authors.forename: Yu
authors.initials: Y
authors.lastname: Xu
authors.forename: Zhengchun
authors.initials: Z
authors.lastname: Liu
authors.forename: Haiyan
authors.initials: H
authors.lastname: Kong
authors.forename: Wenjie
authors.initials: W
authors.lastname: Sun
authors.forename: Zhengkai
authors.initials: Z
authors.lastname: Liao
authors.forename: Fuxiang
authors.initials: F
authors.lastname: Zhou
authors.forename: Conghua
authors.initials: C
authors.lastname: Xie
authors.forename: Yunfeng
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D004195:Disease Models, Animal; D005260:Female; D041722:Genes, Transgenic, Suicide; D015316:Genetic Therapy / Q000379:methods*; D006801:Humans; D007121:Immunocompetence; D018664:Interleukin-12 / Q000096:biosynthesis*; D017254:Leukemic Infiltration; D008156:Luciferases / Q000235:genetics; D051379:Mice; D008810:Mice, Inbred C57BL; D009369:Neoplasms / Q000276:immunology / Q000473:pathology / Q000628:therapy*; D020218:Response Elements; D013601:T-Lymphocytes / Q000276:immunology; D019098:Telomerase / Q000235:genetics*
chemical_list: D018664:Interleukin-12; D008156:Luciferases; D019098:Telomerase