title: [Effect of small interference RNA on E6, E7 mRNA of human papillomavirus type-18 in cervical cancer cells].
abstract: OBJECTIVE
  To study the effect of small interference RNA on E6, E7 mRNA of human papillomavirus type-18 (HPV18) in cervical cancer cells.
  
  
  METHODS
  The specific HPV18E6 and E7 siRNA synthesized by in virtro transcription. The cell activity was detected by methyl thiazolyl tetrazolium (MTT) assay to determine the most suitable concentration, then cells were transfected into HPV18 cervical cancer cells by oligofectamine. HPV18E6, E7 mRNA level was examined by semi-quantitative RT-PCR, and the cell cycles were analyzed by flow cytometry.
  
  
  RESULTS
  The activity of the HeLa cells had an obvious suppression after transfection to 0.57 +/- 0.05 and 0.62 +/- 0.04 compared with the contrast of 0.87 +/- 0.05. The expression of HPV18E6 mRNA level was 0.63 +/- 0.04 before transfection, decreased to 0.53 +/- 0.04, 0.46 +/- 0.02, 0.56 +/- 0.03 evidently after transfection at 24, 48, 72 hours. The expression of HPV18E7 mRNA level was 0.66 +/- 0.03 before transfection and decreased to 0.60 +/- 0.05, 0.52 +/- 0.04, 0.59 +/- 0.02 after transfection at 24, 48, 72 hours. The number of cells in G(2) phase was increased after HPV18E6 siRNA transfection from (1.4 +/- 1.2)% to (66.9 +/- 3.5)%, S phase was declined from (39.4 +/- 0.4)% to (0 +/- 5.5)%, and they were (47.2 +/- 0.5)% and (5.6 +/- 4.2)% in E7 group.
  
  
  CONCLUSIONS
  RNAi exists in HeLa cells, and its effect has specificity.
authors.affiliation: Department of Obstetrics and Gynecology, Afflicated Hospital of Medical College, Qingdao University, Qingdao 266003, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.forename: Zhu-mei
authors.initials: ZM
authors.lastname: Cui
authors.forename: Bing
authors.initials: B
authors.lastname: Luo
authors.forename: Ping
authors.initials: P
authors.lastname: Lin
mesh_terms: D017209:Apoptosis; D002453:Cell Cycle; D045744:Cell Line, Tumor; D004268:DNA-Binding Proteins / Q000235:genetics*; D005260:Female; D015967:Gene Expression Regulation, Viral; D006367:HeLa Cells; D052161:Human papillomavirus 18 / Q000235:genetics* / Q000254:growth & development; D006801:Humans; D009856:Oncogene Proteins, Viral / Q000235:genetics*; D034622:RNA Interference; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D034741:RNA, Small Interfering / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014162:Transfection; D002583:Uterine Cervical Neoplasms / Q000473:pathology / Q000503:physiopathology / Q000821:virology
chemical_list: D004268:DNA-Binding Proteins; C052603:E6 protein, Human papillomavirus type 18; C052633:E7 protein, Human papillomavirus type 18; D009856:Oncogene Proteins, Viral; D012333:RNA, Messenger; D034741:RNA, Small Interfering