title: [Reversal of multidrug resistance in hepatocellular cell line HepG2R by mdr1-antisense RNA].
abstract: OBJECTIVE
  To investigate whether multidrug resistance gene 1(mdr1) could reverse multidrug resistance (MDR) in HepG2R cells.
  
  
  METHODS
  An adenovirus vector, Adeno-asmdr, containing the antisense RNA driven by AFP promoter, was construct. Adeno-EGFP was transfected into HepG2, an AFP producing cell line, L02, a normal human liver cell line, and HeLa, a human cervical cancer cell line, the EGFP transcription level was detected by RT-PCR. Adeno-asmdr was transfected into HepG2R cells, the expression of P-gp170 was detected by western blotting, apoptosis was detected using TUNEL and flow cytometry, cell cycle was analyzed by flow cytometry.
  
  
  RESULTS
  EGFP was highly expressed in HepG2 cells, however, its expression in L02 or HeLa cells was very weak. Western blot showed that the P-gp170 was marked down-regulated 48h after transfection with Adeno-asmdr, and the expression of P-gp170 was detectable at least 7d post-transfection. Compared with control cells, Adeno-asmdr transfected HepG2R cells were more sensitive to different chemicals, as indicated by TUNEL staining and flow cytometry. Chemical treatment arrested the cells in S and G0/M phase.
  
  
  CONCLUSIONS
  The recombinant adenoviral vector, Adeno-asmdr, can block the expression of mdr1, and reverse MDR in HepG2R cells.
authors.affiliation: The Seconed Affiliated Hospital of Chongqing Medical University, Chongqing 400010, China. 32955@126.com
authors.forename: Ying
authors.initials: Y
authors.lastname: Mei
authors.forename: Yu-jun
authors.initials: YJ
authors.lastname: Shi
authors.forename: Xiong
authors.initials: X
authors.lastname: Ding
authors.forename: Hua-gang
authors.initials: HG
authors.lastname: Jian
authors.forename: Jian-ping
authors.initials: JP
authors.lastname: Gong
authors.forename: Chang-an
authors.initials: CA
authors.lastname: Liu
authors.forename: Xiao-guang
authors.initials: XG
authors.lastname: Chen
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics* / Q000378:metabolism; D000256:Adenoviridae / Q000235:genetics; D000970:Antineoplastic Agents / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects; D006528:Carcinoma, Hepatocellular / Q000188:drug therapy / Q000235:genetics / Q000378:metabolism; D002453:Cell Cycle / Q000187:drug effects; D018432:Drug Resistance, Multiple / Q000235:genetics*; D019008:Drug Resistance, Neoplasm / Q000235:genetics*; D015972:Gene Expression Regulation, Neoplastic; D006367:HeLa Cells; D056945:Hep G2 Cells; D006801:Humans; D008113:Liver Neoplasms / Q000188:drug therapy / Q000235:genetics* / Q000378:metabolism; D016372:RNA, Antisense; D014162:Transfection
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000970:Antineoplastic Agents; D016372:RNA, Antisense