title: Enhanced antitumor effect of EGF R-targeted p21WAF-1 and GM-CSF gene transfer in the established murine hepatoma by peritumoral injection.
abstract: One of the major obstacles in current cancer gene therapy is the lack of a gene delivery system with high efficiency and targetability. In this paper, a nonviral gene delivery system GE7, which was designed to target EGF receptor (EGF R) overexpressed on the surface of cancer cel Is through an EGF R-binding oligopeptide (GE7), was used for in vivo gene therapy in a murine subcutaneous hepatoma model. It was demonstrated that the GE7 system could target the reporter gene beta-gal to EGF R-expressing hepatoma cells with high efficiency after in vitro transfection and in vivo peritumoral injection. To improve the therapeutic effect elicited by single gene transfer, human cyclin-dependent kinase inhibitor gene p21WAF-1 and murine cytokine gene GM-CSFwere used simultaneously in peritumoral injection of the GE7/DNA polyplex. The results showed that combined gene transfer of p21WAF-1 and GM-CSF could inhibit the growth of pre-established tumor more effectively and prolong the survival time of hepatoma-bearing mice more significantly than the transfer of a single gene. Apoptosis in the tumor tissues were found when injected with the p21WAF1-DNA polyplex. Prominent inflammatory infiltration was observed in the tumor tissue transfected with the GM-CSF DNA polyplex. Our data demonstrate that the GE7 system-mediated, EGF R-targeted cotransfer of p21WAF-1 and GM-CSF genes exhibit more potent antitumor effect by inducing tumor cell apoptosis and inflammatory responses.
authors.affiliation: National Laboratory for Oncogenes and Related Genes, Shanghai Cancer Institute, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Liu
authors.forename: Peikun
authors.initials: P
authors.lastname: Tian
authors.forename: Yizhi
authors.initials: Y
authors.lastname: Yu
authors.forename: Ming
authors.initials: M
authors.lastname: Yao
authors.forename: Xuetao
authors.initials: X
authors.lastname: Cao
authors.forename: Jianren
authors.initials: J
authors.lastname: Gu
mesh_terms: D000818:Animals; D006528:Carcinoma, Hepatocellular / Q000378:metabolism / Q000473:pathology / Q000628:therapy*; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins / Q000235:genetics* / Q000378:metabolism; D018773:Genes, erbB-1 / Q000502:physiology*; D015316:Genetic Therapy / Q000379:methods*; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D007124:Immunoenzyme Techniques; D015552:Injections, Intralesional; D008114:Liver Neoplasms, Experimental / Q000378:metabolism / Q000473:pathology / Q000628:therapy*; D051379:Mice; D008810:Mice, Inbred C57BL; D010957:Plasmids; D015996:Survival Rate; D013997:Time Factors; D014162:Transfection; D014407:Tumor Cells, Cultured / Q000166:cytology / Q000473:pathology; D001616:beta-Galactosidase / Q000378:metabolism
chemical_list: C493956:CDKN1A protein, human; C493957:Cdkn1a protein, mouse; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D001616:beta-Galactosidase