Activating mechanism of transcriptor NF-kappaB regulated by hepatitis B virus X protein in hepatocellular carcinoma

World J Gastroenterol. 2004 Feb 1;10(3):356-60. doi: 10.3748/wjg.v10.i3.356.


Aim: To investigate the mechanism and significance of NF-kappaB activation regulated by hepatitis B virus X protein (HBx) in hepatitis B virus (HBV)-associated hepatocellular carcinoma (HCC).

Methods: The expression levels of HBx, p65, IkappaB-alpha and ubiquitin were detected by immunohistochemistry in HCC tissue microarrays (TMA) respectively, and IkappaB-alpha was detected by Western blot in HCC and corresponding liver tissues.

Results: The percentage of informative TMA samples was 98.8% in 186 cases with a total of 367 samples. Compared with corresponding liver tissues (60.0%), the HBx expression was obviously decreased in HBV-associated HCC (47.9%, u=2.24, P<0.05). On the contrary, the expressions of p65 (20.6% vs 45.3%, u=4.85, P<0.01) and ubiquitin (8.9% vs 59.0%, u=9.68, P<0.01) were notably elevated in HCC. In addition, IkappaB-alpha had a tendency to go up. Importantly, positive relativity was observed between HBx and p65 (chi2=10.26, P<0.01), p65 and IkappaB-alpha (chi (2)=16.86, P<0.01), IkappaB-alpha and ubiquitin (chi2=8.90, P<0.01) in HCC, respectively.

Conclusion: Both active and non-active forms of NF-kappaB are increased in HBV-associated HCC. Variant HBx is the major cause of the enhancement of NF-kappaB activity. The activation always proceeds in nucleus and the proteasome complexes play an important role in the activation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carcinoma, Hepatocellular / metabolism*
  • Humans
  • Liver Neoplasms / metabolism*
  • NF-kappa B / metabolism*
  • Trans-Activators / metabolism*
  • Viral Regulatory and Accessory Proteins


  • NF-kappa B
  • Trans-Activators
  • Viral Regulatory and Accessory Proteins
  • hepatitis B virus X protein