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Adenovirus E1A and E1B-19K proteins protect human hepatoma cells from transforming growth factor beta1-induced

Vera L Tarakanova1, William S M Wold

  • 1Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO 63104, United States.

Virus Research
|October 27, 2009
PubMed

Insights

Human adenovirus infection protects liver cancer cells from transforming growth factor beta1 (TGFbeta)-induced apoptosis. Adenovirus E1A and E1B-19K proteins block the TGFbeta cell death pathway, offering potential therapeutic insights.

Area of Science:

  • Cell biology
  • Virology
  • Cancer research

Background:

  • Transforming growth factor beta1 (TGFbeta) is a potent inducer of apoptosis in hepatocytes.
  • Hepatocellular carcinoma (HCC) cells often exhibit resistance to TGFbeta-induced apoptosis.

Purpose of the Study:

  • To investigate the effect of human adenovirus species C infection on TGFbeta-induced apoptosis in HCC cells.
  • To identify the viral mechanisms conferring resistance to TGFbeta-mediated cell death.

Main Methods:

  • Infection of Huh-7 HCC cells with human adenovirus species C.
  • Assessment of apoptosis markers including nuclear morphology, caspase processing, mitochondrial membrane potential, and DNA degradation.
  • Analysis of the TGFbeta signaling pathway upstream of mitochondria.
  • Evaluation of the roles of adenovirus E1A and E1B-19K proteins in conferring resistance.

Main Results:

  • Adenovirus infection conferred significant resistance to TGFbeta-induced apoptosis in Huh-7 cells.
  • Protected cells maintained normal nuclear morphology, intact mitochondrial membrane potential, and suppressed caspase activation and DNA degradation.
  • The TGFbeta pro-apoptotic signaling pathway was blocked upstream of the mitochondria in infected cells.
  • Both E1A protein N-terminal sequences and the E1B-19K protein were essential for this protective effect.

Conclusions:

  • Human adenovirus species C infection effectively protects HCC cells from TGFbeta-induced apoptosis.
  • Adenovirus E1A and E1B-19K proteins play crucial roles in inhibiting the TGFbeta apoptotic pathway.
  • These findings suggest potential viral-based strategies for managing HCC by modulating apoptosis resistance.

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