title: [The effects of DNA repair enzyme hMTH1 on HBx-induced malignant transformation of L02 cells].
abstract: OBJECTIVE
  To study the effects of the HBV x gene (HBx) on the biological characteristics and the expression of DNA repair enzyme hMTH1 mRNA of the L02/HBx transgene cell model.
  
  
  METHODS
  Light microscopy was used to observe the morphologic characteristics of gene-transfected cell strain L02/HBx that stably expressed the HBx protein and the control groups of L02 and L02/pcDNA3.1. The changes of L02/HBx on the proliferation, cell cycle and apoptosis were observed by MTT assays and flow cytometry analysis respectively. Moreover, the malignant transformation of L02/HBx was assayed by colony formation in soft agar and the expression of DNA repair enzyme hMTH1 mRNA was assayed in each group by real-time qPCR.
  
  
  RESULTS
  Inversion phase contrast microscope showed that the morphologic characteristics of L02/HBx had changed obviously compared with control groups. The MTT showed that L02/HBx proliferated more quickly and flow cytometry analysis indicated that HBx could accelerate the progression of cell cycle and inhibit apoptosis. Colony formation in soft agar demonstrated that the rate of colony formation of L02/HBx was remarkably higher than the L02 and the L02/pcDNA3.1 cells (P < 0.05). The real-time qPCR detection showed that the expression of hMTH1 mRNA in L02/HBx was significantly higher than that in the control groups (P < 0.05).
  
  
  CONCLUSIONS
  HBx could play an important role in the malignant transformation of L02/HBx and the over expression of hMTH1 mRNA.
authors.affiliation: Department of Gastroenterology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China. bcheng@tjh.tjmu.edu.cn
authors.forename: Bin
authors.initials: B
authors.lastname: Cheng
authors.forename: Yao-Chu
authors.initials: YC
authors.lastname: Zheng
authors.forename: Xiao-Rong
authors.initials: XR
authors.lastname: Guo
mesh_terms: D017209:Apoptosis; D002460:Cell Line; D002471:Cell Transformation, Neoplastic / Q000235:genetics*; D045643:DNA Repair Enzymes / Q000235:genetics*; D005434:Flow Cytometry; D005814:Genes, Viral; D006515:Hepatitis B virus / Q000235:genetics; D022781:Hepatocytes; D006801:Humans; D010744:Phosphoric Monoester Hydrolases / Q000235:genetics*; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger; D015534:Trans-Activators / Q000235:genetics*; D014158:Transcription, Genetic; D014162:Transfection; D054334:Viral Regulatory and Accessory Proteins / Q000235:genetics*
chemical_list: D012333:RNA, Messenger; D015534:Trans-Activators; D054334:Viral Regulatory and Accessory Proteins; C057628:hepatitis B virus X protein; D010744:Phosphoric Monoester Hydrolases; C078207:8-oxodGTPase; D045643:DNA Repair Enzymes