title: [Effects of class I( phosphatidylinositol-3-kinases inhibitor on gastric cancer cell xenografts in nude mice].
abstract: OBJECTIVE
  To investigate the effect of recombinant adenovirus (phosphatidylinositol-3-kinases(PI3K)(I()-RNAi-AD which blocks the class I( PI3K signaling pathway on gastric carcinoma cells xenografts in nude mice.
  
  
  METHODS
  Subcutaneous tumor models of nude mice were established with SGC7901 cells and randomly divided into PI3K(I()-RNAi-AD group, NC-RNAi-GFP-AD group and control group. The tumor size and the inhibitory rate of tumor growth on days 3, 6, and 9 after cell transplantation were measured. The expression of TNF-α, COX2, P53, PCNA, E-cadherin and nm23/DNPK in tumor tissues were detected by immunohistochemistry.
  
  
  RESULTS
  Tumor growth was significantly inhibited in the PI3K(I()-RNAi-AD group(14.2%, 21.0%, and 28.1%) on days 3, 6, 9 compared with NC-RNAi-GFP-AD group(1.3%, 1.9%, and 2.0%, all P<0.05). The expressions of TNF-α, P53, E-cadherin and nm23/DNPK were up-regulated, and the expressions of COX2 and PCNA were down-regulated in the PI3K(I()-RNAi-AD group by immunohistochemical staining(all P<0.05).
  
  
  CONCLUSIONS
  PI3K(I()-RNAi-AD can inhibit the growth of SGC7901 cell transplantation tumor in vivo in nude mice by inhibiting cell growth, reducing the capacity of tumor invasion and inhibiting tumor angiogenesis.
authors.affiliation: Department of General Surgery, The Second Affiliated Hospital, Soochow University, Suzhou 215000, China. xingcg@126.com.
authors.forename: Ru-Lu
authors.initials: RL
authors.lastname: Liu
authors.forename: Kui
authors.initials: K
authors.lastname: Zhao
authors.forename: Jia-Lei
authors.initials: JL
authors.lastname: Sun
authors.forename: Li-Yan
authors.initials: LY
authors.lastname: Yu
authors.forename: Bao-Song
authors.initials: BS
authors.lastname: Zhu
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Yang
authors.forename: Chun-Gen
authors.initials: CG
authors.lastname: Xing
mesh_terms: D000256:Adenoviridae; D000818:Animals; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D058534:Class I Phosphatidylinositol 3-Kinases; D064593:Heterografts; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D019869:Phosphatidylinositol 3-Kinases; D010716:Phosphatidylinositols; D013274:Stomach Neoplasms
chemical_list: D010716:Phosphatidylinositols; D019869:Phosphatidylinositol 3-Kinases; D058534:Class I Phosphatidylinositol 3-Kinases