title: Nanoparticle-delivered VEGF-silencing cassette and suicide gene expression cassettes inhibit colon carcinoma growth in vitro and in vivo.
abstract: The strategies for tumor-specific expression of suicide genes and target tumor angiogenesis have been tested in tumors. However, the anti-tumor efficacy of the combination of these two strategies, particularly, delivering suicide gene and anti-angiogenesis agent by nanoparticles, has not yet been evaluated in colon carcinoma. We constructed a cassette to silence VEGF-A expression and express a fused yCDglyTK gene driven by tumor-specific promoter (shVEGF-CDTK). The DNA carrying shVEGF-CDTK was delivered into colon carcinoma cells by calcium phosphate nanoparticles (CPNPs). Cell proliferation was measured by MTT assay, and apoptosis was detected by flow cytometry. The anti-tumor effect of the combined cassette was tested in xenograft animal model. With 5-fluorocytosine (5-FC), CPNP-delivered shVEGF-CDTK DNA (CPNP-shVEGF-CDTK) showed high expression of fused yCDglyTK gene and effectively silenced VEGF-A expression in vitro and in vivo, which significantly inhibited colon carcinoma cell proliferation and induced apoptosis in vitro. With 5-FC, the systemic delivery of CPNP-shVEGF-CDTK significantly inhibited tumor growth in the colon carcinoma xenograft animal model. The combined cassette is obviously effective in inhibiting tumor cell proliferation and inducing apoptosis in vitro and tumor growth in vivo than the CPNP-shVEGF or CPNP-CDTK alone. The combination of VEGF-A-silencing and tumor-specific expression of suicide gene is an effective strategy for colon carcinoma treatment.
authors.affiliation: Department of Gastroenterology, Xiangya Hospital, Changsha, 410008, China.
authors.forename: Aimin
authors.initials: A
authors.lastname: Leng
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.forename: Ting
authors.initials: T
authors.lastname: Liu
authors.forename: Jianfang
authors.initials: J
authors.lastname: Cui
authors.forename: Xiu-Hua
authors.initials: XH
authors.lastname: Li
authors.forename: Yanan
authors.initials: Y
authors.lastname: Zhu
authors.forename: Ting
authors.initials: T
authors.lastname: Xiong
authors.forename: Yuxiang
authors.initials: Y
authors.lastname: Chen
mesh_terms: D000818:Animals; D000963:Antimetabolites / Q000494:pharmacology; D002130:Calcium Phosphates / Q000737:chemistry; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D003110:Colonic Neoplasms / Q000235:genetics / Q000473:pathology / Q000628:therapy*; D043525:Cytosine Deaminase / Q000235:genetics / Q000378:metabolism; D005437:Flucytosine / Q000494:pharmacology; D005455:Fluorescent Antibody Technique; D018014:Gene Transfer Techniques; D041722:Genes, Transgenic, Suicide / Q000235:genetics*; D015316:Genetic Therapy / Q000379:methods; D005822:Genetic Vectors / Q000737:chemistry / Q000235:genetics; D018259:Herpesvirus 1, Human / Q000201:enzymology / Q000235:genetics; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D053758:Nanoparticles / Q000737:chemistry*; D034741:RNA, Small Interfering / Q000737:chemistry / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013937:Thymidine Kinase / Q000235:genetics / Q000378:metabolism; D042461:Vascular Endothelial Growth Factor A / Q000235:genetics*; D023041:Xenograft Model Antitumor Assays; D015003:Yeasts / Q000201:enzymology / Q000235:genetics
chemical_list: D000963:Antimetabolites; D002130:Calcium Phosphates; D034741:RNA, Small Interfering; D042461:Vascular Endothelial Growth Factor A; C020243:calcium phosphate; D005437:Flucytosine; D013937:Thymidine Kinase; D043525:Cytosine Deaminase