title: Combination treatment for osteosarcoma with baculoviral vector mediated gene therapy (p53) and chemotherapy (adriamycin).
abstract: The insect baculovirus Autographa californica multiple nuclear polyhedrosis virus (AcMNPV) has been evaluated as a vector for gene delivery to human tumor cells. A human osteogenic sarcoma cell line, Saos-2, was found to be highly susceptible to infection with a baculoviral vector, with nearly 100% of Saos-2 cells being able to express a lacZ reporter gene after a brief exposure to the virus at a m.o.i. of 30 pfu/cell. The production of beta-galactosidase protein was 18-times greater than that in HepG2 cells which were previously thought to be the mammalian cells most susceptible to the baculovirus. The possibility of developing a baculovirus as a cytotoxic vector for p53-defective cancer was tested by destruction of Saos-2 cells (p53-/-) with a recombinant baculovirus containing the wild type p53 gene (BV-p53) in vitro. The p53 baculovirus induced apoptotic cell death in tumor cells in a dose-dependent manner with approximately 60% killing at an m.o.i. of 160 pfu/cell. Combined treatments of gene therapy (p53) and chemotherapy (adriamycin) resulted in synergistic and potent killing of the osteogenic sarcoma cells. For example, greater than 95% of Saos-2 cells were killed by the combination of BV-p53 (m.o.i. of 100) and adriamycin (35 ng/ml), whereas approximately 50% and approximately 55% cells were killed by BV-p53 and adriamycin alone, respectively. These results indicate that a baculoviral gene delivery vector can be used to efficiently target certain types of mammalian cells and the combination treatment of gene-therapy mediated by a baculovirus and chemotherapy may enhance induction of apoptosis in cancer cells.
authors.affiliation: Clinical Research Center, College of Medicine, Inha University, Inchon, Korea. sunuksong@inha.ac.kr
authors.forename: S U
authors.initials: SU
authors.lastname: Song
authors.forename: F M
authors.initials: FM
authors.lastname: Boyce
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis / Q000235:genetics; D016367:Baculoviridae / Q000235:genetics; D001859:Bone Neoplasms / Q000628:therapy* / Q000821:virology; D004317:Doxorubicin / Q000494:pharmacology*; D015316:Genetic Therapy / Q000379:methods*; D005822:Genetic Vectors; D006801:Humans; D012516:Osteosarcoma / Q000628:therapy* / Q000821:virology; D014407:Tumor Cells, Cultured; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism
chemical_list: D000970:Antineoplastic Agents; D016159:Tumor Suppressor Protein p53; D004317:Doxorubicin