title: [The effect of Rac1 siRNA on the biological behaviors of gastrointestinal cancer cells].
abstract: OBJECTIVE
  To explore the effect of Rac1 siRNA on the expression of Rac1 and the biological behaviors of gastrointestinal cancer cells.
  
  
  METHODS
  Rac1 siRNA was transfected into human gastric cancer cell line SGC803 and colorectal cancer cell line Lovo by lipofectamine 2000. The expression of Rac1 in these cell lines were detected by Western blot and RT-PCR after 48 hours of the transfection. The effect of Rac1 on the proliferation of human gastric cancer cell line SGC803 and colorectal cancer cell line Lovo were tested by CCK8 kit. The motility of the transfected and the control cancer cells were assessed by Wound-healing assay and invasion assay. The apoptotic index was evaluated by Hoechst 33258 staining and FCM.
  
  
  RESULTS
  Rac1 siRNA can down-regulated the expression of Rac1 on human gastric cancer cell line SGC803 and colorectal cancer cell line Lovo remarkably, and Rac1 siRNA can inhibit both the proliferation and motility of the transfectants. Analysis of apoptosis demonstrated that Rac1 siRNA can promote apoptosis of the gastric cancer cells and colorectal cancer cells.
  
  
  CONCLUSIONS
  Rac1 play an important role in the regulation of biological behaviors of human gastric cancer and colorectal cancer cells, and the interference of Rac1 expression could provide a novel path in reversing the malignant phenotypes of these malignancies.
authors.affiliation: Laboratory of Signal Transduction & Molecular Targeting Therapy, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Huang
authors.forename: Nan
authors.initials: N
authors.lastname: Lan
authors.forename: Ming
authors.initials: M
authors.lastname: Liu
authors.forename: Ji
authors.initials: J
authors.lastname: Chen
authors.forename: Ji-Tao
authors.initials: JT
authors.lastname: Zhou
authors.forename: Ya-Jie
authors.initials: YJ
authors.lastname: Zhu
authors.forename: Su-Rui
authors.initials: SR
authors.lastname: Liu
authors.forename: Qiu-Lin
authors.initials: QL
authors.lastname: Tang
authors.forename: Xiang-Zheng
authors.initials: XZ
authors.lastname: Chen
authors.forename: Feng
authors.initials: F
authors.lastname: Bi
mesh_terms: D045744:Cell Line, Tumor; D049109:Cell Proliferation; D015179:Colorectal Neoplasms / Q000235:genetics / Q000473:pathology; D005770:Gastrointestinal Neoplasms / Q000235:genetics* / Q000473:pathology*; D006801:Humans; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000235:genetics*; D013274:Stomach Neoplasms / Q000235:genetics / Q000473:pathology; D020830:rac1 GTP-Binding Protein / Q000235:genetics*
chemical_list: C107953:RAC1 protein, human; D034741:RNA, Small Interfering; D020830:rac1 GTP-Binding Protein