title: Expression of HIF-1α ODD domain fused canine caspase 3 by EGFR promoter-driven adenovirus vector induces cytotoxicity in canine breast tumor cells under hypoxia.
abstract: Adenovirus (Ad) vectors are widely used in cancer gene therapies. However, compared to human patients, relatively limited information is available on gene transduction efficiency or cell-specific cytotoxicity in canine tumor cells transduced with Ad vectors. Since epidermal growth factor receptor (EGFR) is highly expressed on canine breast tumor cells, we sought to develop an Ad vector based on the RGD fiber-mutant adenovirus vector (AdRGD) that expresses canine caspase 3 under the control of EGFR promoter. The aims of this study were to achieve high transduction efficiency with transgene expression restricted to canine breast tumor cells. Using EGFR promoter-driven AdRGD, we were able to restrict transgene expression to canine breast tumor cells with no evidence of expression in normal cells. Canine breast tumor cells transduced with EGFR promoter-driven AdRGD carrying canine caspase 3 gene showed cytotoxic activity. We constructed a second AdRGD vector that expressed oxygen-dependent degradation (ODD)-caspase 3 under the control of the EGFR promoter; the fusion protein contains a core part of the ODD domain of hypoxia inducible factor-1 alpha (HIF-1α) fused to caspase 3. Transduction of canine breast tumor cells with EGFR promoter-driven AdRGD expressing ODD-caspase 3 induced a higher rate of cell death under hypoxic conditions compared with under normoxia. The results indicate that the EGFR promoter-driven AdRGD vectors will be of value for tumor-specific transgene expression and safe cancer gene therapy in dogs.
authors.affiliation: Laboratory of Veterinary Immunology, Department of Veterinary Medicine, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan. m-okamoto@azabu-u.ac.jp.
authors.forename: Mariko
authors.initials: M
authors.lastname: Okamoto
authors.affiliation: Laboratory of Veterinary Immunology, Department of Veterinary Medicine, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan.
authors.forename: Ai
authors.initials: A
authors.lastname: Asamura
authors.affiliation: Laboratory of Veterinary Immunology, Department of Veterinary Medicine, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan.
authors.forename: Ko
authors.initials: K
authors.lastname: Tanaka
authors.affiliation: Laboratory of Veterinary Immunology, Department of Veterinary Medicine, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan.
authors.forename: Takefumi
authors.initials: T
authors.lastname: Soeda
authors.affiliation: Laboratory of Veterinary Immunology, Department of Veterinary Medicine, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan.
authors.forename: Kyo
authors.initials: K
authors.lastname: Watanabe
authors.affiliation: Laboratory of Biochemistry and Molecular Biology, Graduate School and School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka, 565-0871, Japan.|Laboratory of Hepatocyte Regulation, Health and Nutrition, National Institutes of Biomedical Innovation, 7-6-8 Saito, Asagi, Osaka, Ibaraki, 567-0085, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Mizuguchi
authors.affiliation: Laboratory of Veterinary Immunology, Department of Veterinary Medicine, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan.
authors.forename: Teruo
authors.initials: T
authors.lastname: Ikeda
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D000818:Animals; D053148:Caspase 3 / Q000235:genetics*; D015687:Cell Hypoxia; D045744:Cell Line, Tumor; D004285:Dogs; D015972:Gene Expression Regulation, Neoplastic; D018773:Genes, erbB-1 / Q000235:genetics*; D005822:Genetic Vectors; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000235:genetics*; D011401:Promoter Regions, Genetic / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000235:genetics
chemical_list: D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D011993:Recombinant Fusion Proteins; D053148:Caspase 3
keywords: Adenovirus vector; Canine breast tumor; EGFR promoter; ODD domain; caspase3