title: [Expression of ERK5 in multidrug-resistant hepatocellular carcinoma cell line].
abstract: OBJECTIVE
  To detect the expression of extracellular-signal regulated protein kinase 5 (ERK5) in multidrug-resistant hepatocellular carcinoma cell lines hepG2/ADM and BEL-7402/5-FU and in the parental cell lines (hepG2 and BEL-7402), and study the role of ERK5 in multidrug resistance of hepatocellular carcinoma.
  
  
  METHODS
  MTT assay was used to determine the multidrug resistance (MDR) of hepG2/ADM and BEL-7402/5-FU cells. Real-time PCR and Western blotting were used to detect the expression of ERK5 at mRNA and protein levels in the 4 cell lines.
  
  
  RESULTS
  The resistance indices to ADM, 5-FU, and CDDP was 12.34, 5.74, and 3.81 in hepG2/ADM cells, and the resistance indices to 5-FU, VCR, OHP, MTX, and ADM was 15.32, 10.08, 5. 85, 6.74 and 3.26 in BEL-7402 cells, respectively. Compared with those in hepG2 and BEL-7402 cells, the ERK5 gene was up-regulated at both mRNA and protein levels in HepG2/ADM cells, but down-regulated at the mRNA level and up-regulated at the protein level in BEL-7402/5-FU cells.
  
  
  CONCLUSIONS
  ERK5 is related to multidrug resistance in HepG2/ADM and BEL-7402/5-FU cells, and may provide new clues for reversing multidrug resistance of hepatocellular carcinoma cells.
authors.affiliation: Postdoctoral Station, Zhongshan Hospital, Xiamen University, Xiamen, China. yanfeng@xmzsh.com
authors.forename: Feng
authors.initials: F
authors.lastname: Yan
authors.forename: Xiao-Min
authors.initials: XM
authors.lastname: Wang
authors.forename: Chao
authors.initials: C
authors.lastname: Pan
mesh_terms: D006528:Carcinoma, Hepatocellular / Q000378:metabolism* / Q000473:pathology; D004317:Doxorubicin / Q000494:pharmacology; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D005472:Fluorouracil / Q000494:pharmacology; D006801:Humans; D008113:Liver Neoplasms / Q000378:metabolism* / Q000473:pathology; D048054:Mitogen-Activated Protein Kinase 7 / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D014407:Tumor Cells, Cultured
chemical_list: D012333:RNA, Messenger; D004317:Doxorubicin; D048054:Mitogen-Activated Protein Kinase 7; D005472:Fluorouracil