title: [Suppression of c-myc expression by interference RNA in HepG2 hepatocellular carcinoma cells].
abstract: OBJECTIVE
  To study the inhibitory effect of RNA interference (RNAi) on c-myc expression in hepatocellular carcinoma cell line, HepG2.
  
  
  METHODS
  Expression vector of c-myc gene-targeting small interference RNA (siRNA) was constructed (psilencer-c-myc) and transfected into HepG2 cells by lipofectamine, and the unloaded vector was used as control (mock). The expression of c-myc mRNA and protein was identified by quantitive PCR and Western blot. Apoptosis of the transfected cells was examined by flow cytometry and immunofluorescent microscopy.
  
  
  RESULTS
  After HepG2 cells were transfected with psilencer-c-myc, the expression of c-myc mRNA and protein was suppressed with an inhibition rate of 67% compared with the mock-transfected cells. Apoptosis was identified in the transfected HepG2 cells.
  
  
  CONCLUSIONS
  The expression of c-myc at transcriptional and translational levels in HepG2 cells transfected with siRNA is markedly inhibited, which may be associated with the induction of apoptosis.
authors.affiliation: Department of Molecular Immunology, Cancer Institute (Hospital), Chinese Academy of Medical Science, Peking Union Medical College, Beijing 100021, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Xu
authors.forename: Yi-Hua
authors.initials: YH
authors.lastname: Wang
authors.forename: Ji-Dong
authors.initials: JD
authors.lastname: Gao
authors.forename: Jue
authors.initials: J
authors.lastname: Ye
authors.forename: Hong-Xia
authors.initials: HX
authors.lastname: Zhu
authors.forename: Ning-Zhi
authors.initials: NZ
authors.lastname: Xu
authors.forename: Xing-Yu
authors.initials: XY
authors.lastname: Wang
authors.forename: Zong-Tang
authors.initials: ZT
authors.lastname: Sun
mesh_terms: D017209:Apoptosis / Q000187:drug effects; D006528:Carcinoma, Hepatocellular / Q000378:metabolism* / Q000473:pathology; D002453:Cell Cycle / Q000187:drug effects; D045744:Cell Line, Tumor; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D016259:Genes, myc; D005822:Genetic Vectors; D006801:Humans; D008113:Liver Neoplasms / Q000378:metabolism* / Q000473:pathology; D016271:Proto-Oncogene Proteins c-myc / Q000096:biosynthesis* / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D034741:RNA, Small Interfering / Q000235:genetics / Q000494:pharmacology*; D014162:Transfection
chemical_list: D016271:Proto-Oncogene Proteins c-myc; D012333:RNA, Messenger; D034741:RNA, Small Interfering