Archives of Virology

, Volume 154, Issue 7, pp 1021–1026 | Cite as

Establishment of cell lines using a doxycycline-inducible gene expression system to regulate expression of hepatitis B virus X protein

  • Hong Tang
  • Li Liu
  • Feng-Jun Liu
  • En-Qiang Chen
  • Seishi Murakami
  • Yong Lin
  • Fang He
  • Tao-You Zhou
  • Fei-Jun Huang
Original Article


The hepatitis B virus (HBV) X gene plays an important role in HBV-associated pathogenesis, especially hepatocarcinogenesis. Establishment of a stable and regulable HBx expression system will allow study of the function of this gene. Here, we describe the development of a doxycycline-inducible recombinant plasmid (pBPSTR3-FlagX) with the full-length HBV X gene and all components of the tetracycline-on (“Tet-on”) gene expression system. This vector exhibited dose-dependent doxycycline-dependent induction of the Flag-HBx protein in HepG2 and Hep3B cells. We also observed dose-dependent doxycycline transactivation of HBx in HepG2 cells. After transfecting HepG2 cells with the pBPSTR3-FlagX plasmid, we isolated five puromycin-resistant cell clones with stable HBx expression, two of which exhibited stable and tight control of HBx expression by doxycycline. This new system has great potential for functional studies of the HBV X gene.


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Hong Tang
    • 1
  • Li Liu
    • 1
  • Feng-Jun Liu
    • 1
  • En-Qiang Chen
    • 1
  • Seishi Murakami
    • 2
  • Yong Lin
    • 1
  • Fang He
    • 1
  • Tao-You Zhou
    • 1
  • Fei-Jun Huang
    • 3
  1. 1.Center of Infectious Diseases, Division of Molecular Biology of Infectious DiseasesNational Key Laboratory of Biotherapy (Sichuan University), West China Hospital of Sichuan UniversityChengduPeople’s Republic of China
  2. 2.Department of Molecular Oncology, Cancer Research InstituteKanazawa UniversityKanazawaJapan
  3. 3.Department of Forensic Pathology, College of Basic Medicine and Forensic MedicineSichuan UniversityChengduPeople’s Republic of China

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