title: A small interfering RNA targeting osteopontin as gastric cancer therapeutics.
abstract: It has been shown that Osteopontin (OPN) protein is overexpressed in the majority of gastric cancers and associated with its pathogenesis. To better understanding of the role of OPN, RNA interference (RNAi) was used to inhibit OPN expression in the human gastric cancer cells in vitro and in vivo. BGC-823, gastric cancer cell line, was stably transfected with OPN small interfering RNA (siRNA) plasmids. OPN siRNA significantly reduced the expression of OPN in human gastric cancer cells in transient- and stable-transfection manner. In vitro down-regulation of OPN inhibited BGC-823 cell growth, anchorage-independent growth, migration and invasion. The results further showed that OPN small interfering RNA suppressed the growth, migration and invasion of gastric cancer cell through the reduction of MMP-2 and uPA expression, inhibition of NF-kappaB DNA binding activity, and down-regulation of Akt phosphorylation. In vivo animal studies showed that tumor growth was significantly inhibited in OPN siRNA group compared with WT. Intratumor gene therapy with polyethylenimine/OPNsi also resulted in tumor growth suppression and prolonged survival. Thus, this study demonstrated that down-regulation of OPN could suppress the growth, migration and invasion of gastric cancer cells, and OPN siRNA may offer a new potential gene therapy approach for human gastric cancer in future.
authors.affiliation: Department of General Surgery, Changhai Hospital, The Second Military Medical University, Shanghai 200433, PR China.
authors.forename: Mouchun
authors.initials: M
authors.lastname: Gong
authors.forename: Zhengmao
authors.initials: Z
authors.lastname: Lu
authors.forename: Guoen
authors.initials: G
authors.lastname: Fang
authors.forename: Jianwei
authors.initials: J
authors.lastname: Bi
authors.forename: Xuchao
authors.initials: X
authors.lastname: Xue
mesh_terms: D002455:Cell Division; D045744:Cell Line, Tumor; D002465:Cell Movement; D017931:DNA Primers; D004273:DNA, Neoplasm / Q000235:genetics; D015536:Down-Regulation; D024202:Electrophoretic Mobility Shift Assay; D015972:Gene Expression Regulation, Neoplastic; D015316:Genetic Therapy / Q000379:methods*; D006801:Humans; D009361:Neoplasm Invasiveness; D053495:Osteopontin / Q000235:genetics*; D010957:Plasmids / Q000235:genetics; D034741:RNA, Small Interfering / Q000235:genetics*; D013274:Stomach Neoplasms / Q000235:genetics* / Q000473:pathology / Q000628:therapy*; D014162:Transfection
chemical_list: D017931:DNA Primers; D004273:DNA, Neoplasm; D034741:RNA, Small Interfering; D053495:Osteopontin