title: Cost-effective method of siRNA preparation and its application to inhibit hepatitis B virus replication in HepG2 cells.
abstract: OBJECTIVE
  To find a cost-effective method of preparation of short interfering RNAs based on cloning, fermentation, digestion and purification (CFDP) and test its feasibility to inhibit hepatitis B virus replication in cell culture.
  
  
  METHODS
  We constructed an expression vector containing T7 and tac promoter in a head-to-head orientation. cDNA fragment of interest was cloned into this vector between the opposing promoters. dsRNAs were expressed with this vector in Escherichia coli, and purified by affinity chromatography using CF 11 column. They were digested by RNase III in a buffer containing manganese ions, then separated on 15% non-denaturing PAGE, and the siRNAs about 25 bp in length were recovered. siRNAs prepared with CFDP were co-transfected with target gene expression plasmid into human cell lines with lipofectamine 2,000 to test their inhibition efficiency.
  
  
  RESULTS
  siRNAs corresponding to part of the hepatitis B virus polymerase gene (siHBVP) prepared by CFDP specifically and dramatically suppressed the virus protein expression. The HBsAg expression level was reduced to 10% that of the control by co-transfection of 60 nmol/L siHBVP in SMMC7721 cells. Dose-dependent effect on suppression of HBsAg and HBeAg expression was observed in HepG2 cells. The highest inhibition rate was kept at 70% during the six days after transfection of 7.5 nmol/L siHBVP.
  
  
  CONCLUSIONS
  We show CFDP is a very promising method to prepare therapeutic agents in anti-virus applications.
authors.affiliation: Department of Biochemistry, School of Life Sciences, Fudan University, 220 Handan Road, Shanghai 200433, China.
authors.forename: Zhi-Kang
authors.initials: ZK
authors.lastname: Qian
authors.forename: Bao-Qin
authors.initials: BQ
authors.lastname: Xuan
authors.forename: Tai-Shan
authors.initials: TS
authors.lastname: Min
authors.forename: Jian-Feng
authors.initials: JF
authors.lastname: Xu
authors.forename: Lin
authors.initials: L
authors.lastname: Li
authors.forename: Wei-Da
authors.initials: WD
authors.lastname: Huang
mesh_terms: D001483:Base Sequence; D006528:Carcinoma, Hepatocellular; D045744:Cell Line, Tumor; D003362:Cost-Benefit Analysis; D015967:Gene Expression Regulation, Viral; D049452:Green Fluorescent Proteins / Q000235:genetics; D006514:Hepatitis B Surface Antigens / Q000235:genetics; D006513:Hepatitis B e Antigens / Q000235:genetics; D006515:Hepatitis B virus / Q000235:genetics* / Q000254:growth & development*; D006801:Humans; D008113:Liver Neoplasms; D008969:Molecular Sequence Data; D010957:Plasmids / Q000235:genetics; D012313:RNA / Q000235:genetics; D012330:RNA, Double-Stranded / Q000235:genetics; D034741:RNA, Small Interfering / Q000191:economics* / Q000235:genetics*; D043244:Ribonuclease III; D014162:Transfection; D014779:Virus Replication / Q000235:genetics*
chemical_list: D006514:Hepatitis B Surface Antigens; D006513:Hepatitis B e Antigens; D012330:RNA, Double-Stranded; D034741:RNA, Small Interfering; C039919:RNA, recombinant; D049452:Green Fluorescent Proteins; D012313:RNA; D043244:Ribonuclease III