title: RNA interference by expression of short hairpin RNAs suppresses bcl-xL gene expression in nasopharyngeal carcinoma cells.
abstract: OBJECTIVE
  To evaluate a new plasmid mediated RNA interference (RNAi) system and investigate whether knock-down of bcl-xL by short hairpin RNA (shRNA) can induce apoptosis of human nasopharyngeal carcinoma (NPC) cell line CNE-2Z in vitro.
  
  
  METHODS
  The plasmid containing mU6 promoter was subcloned to yield the pmU6 plasmid, recombinant plasmid expressing shRNA targeting bcl-xL gene was designed and constructed, and were co-transfected cells with green fluorescence protein expressing plasmid. Flow cytometry was used to evaluate transfection efficiency, and RT-PCR and Western blot were applied to analyze bcl-xL mRNA and protein levels, respectively.
  
  
  RESULTS
  The shRNA expressed by the recombinant plasmid efficiently suppressed bcl-xL gene expression and induced apoptosis of NPC cells in vitro.
  
  
  CONCLUSIONS
  The recombinant plasmid can sufficiently mediate RNAi in CNE-2Z cells, and knock-down of the bcl-xL expression by shRNA significantly induced apoptosis in CNE-2Z cells. The results suggest this new system, mediated RNAi can be used as a tool for the study of gene function and gene therapy.
authors.affiliation: Institute of Biochemistry and Molecular Biology, The First Affiliated Hospital, Guangdong Medical College, Zhanjiang 524023, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Liu
authors.forename: Cheng-Wei
authors.initials: CW
authors.lastname: He
authors.forename: Yue-Fei
authors.initials: YF
authors.lastname: Zhang
authors.forename: Ke-Yuan
authors.initials: KY
authors.lastname: Zhou
mesh_terms: D017209:Apoptosis; D045744:Cell Line, Tumor; D049452:Green Fluorescent Proteins; D006801:Humans; D009303:Nasopharyngeal Neoplasms / Q000378:metabolism / Q000473:pathology*; D010957:Plasmids; D011401:Promoter Regions, Genetic; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000096:biosynthesis* / Q000235:genetics; D034622:RNA Interference; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D034741:RNA, Small Interfering / Q000235:genetics*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D014162:Transfection; D051020:bcl-X Protein
chemical_list: C494811:BCL2L1 protein, human; D019253:Proto-Oncogene Proteins c-bcl-2; D012333:RNA, Messenger; D034741:RNA, Small Interfering; D011994:Recombinant Proteins; D051020:bcl-X Protein; D049452:Green Fluorescent Proteins