title: Combination of cytosine deaminase suicide gene expression with DR5 antibody treatment increases cancer cell cytotoxicity.
abstract: Combined treatment using adenoviral-directed enzyme/prodrug therapy and immunotherapy has the potential to become a powerful alternative method of cancer therapy. We have developed adenoviral vectors encoding the cytosine deaminase gene (Ad-CD) and cytosine deaminase:uracil phosphoribosyltransferase fusion gene (Ad-CD:UPRT). A monoclonal antibody, TRA-8, specifically binds to death receptor 5, one of two death receptors bound by tumor necrosis factor-related apoptosis-inducing ligand (TRAIL). The purpose of this study was to evaluate cytotoxicity in vitro and therapeutic efficacy in vivo of the combination of Ad-CD:UPRT and TRA-8 against human pancreatic cancer and glioma cell lines. The present study demonstrates that Ad-CD:UPRT infection resulted in increased 5-FC-mediated cell killing, compared with Ad-CD. Furthermore, a significant increase of cytotoxicity following Ad-CD:UPRT/5-FC and TRA-8 treatment of cancer cells in vitro was demonstrated. Animal studies showed significant inhibition of tumor growth of MIA PaCa-2 pancreatic and D54MG glioma xenografts by the combination of Ad-CD:UPRT/5-FC plus TRA-8 as compared with either agent alone or no treatment. The results suggest that the combination of Ad-CD:UPRT/5-FC with TRA-8 produces an additive cytotoxic effect in cancer cells in vitro and in vivo. These data indicate that combined treatment with enzyme/prodrug therapy and TRAIL immunotherapy provides a promising approach for cancer therapy.
authors.affiliation: Department of Radiation Oncology, University of Alabama at Birmingham, 674 Wallace Tumor Institute, Birmingham, Alabama 35294, USA.
authors.forename: S A
authors.initials: SA
authors.lastname: Kaliberov
authors.forename: S
authors.initials: S
authors.lastname: Chiz
authors.forename: L N
authors.initials: LN
authors.lastname: Kaliberova
authors.forename: V
authors.initials: V
authors.lastname: Krendelchtchikova
authors.forename: D
authors.initials: D
authors.lastname: Della Manna
authors.forename: T
authors.initials: T
authors.lastname: Zhou
authors.forename: D J
authors.initials: DJ
authors.lastname: Buchsbaum
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D000704:Analysis of Variance; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000378:metabolism / Q000627:therapeutic use*; D015153:Blotting, Western; D045744:Cell Line, Tumor; D043525:Cytosine Deaminase / Q000235:genetics*; D003601:Cytotoxicity Tests, Immunologic; D005260:Female; D005434:Flow Cytometry; D041722:Genes, Transgenic, Suicide / Q000235:genetics*; D015316:Genetic Therapy / Q000379:methods*; D005910:Glioma / Q000276:immunology / Q000628:therapy*; D006801:Humans; D007167:Immunotherapy / Q000379:methods*; D051379:Mice; D008819:Mice, Nude; D008856:Microscopy, Fluorescence; D010190:Pancreatic Neoplasms / Q000276:immunology / Q000628:therapy*; D010430:Pentosyltransferases / Q000235:genetics; D011355:Prodrugs / Q000627:therapeutic use; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D011355:Prodrugs; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor; C505639:TNFRSF10B protein, human; C505640:Tnfrsf10b protein, mouse; D010430:Pentosyltransferases; C023269:uracil phosphoribosyltransferase; D043525:Cytosine Deaminase