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Use of Interferon-γ Enzyme-linked Immunospot Assay to Characterize Novel T-cell Epitopes of Human Papillomavirus
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Inactivation of interferon regulatory factor-1 tumor suppressor protein by HPV E7 oncoprotein. Implication for the

J S Park1, E J Kim, H J Kwon

  • 1Department of Obstetrics and Gynecology, Catholic University Medical College, Seoul, 137-040 Korea.

The Journal of Biological Chemistry
|March 4, 2000
PubMed

Insights

Human papillomavirus (HPV) E7 protein inactivates the IRF-1 tumor suppressor by recruiting histone deacetylase (HDAC). This interaction is crucial for HPV

Area of Science:

  • Oncology
  • Virology
  • Molecular Biology

Background:

  • Interferon regulatory factor (IRF)-1 acts as a tumor suppressor.
  • Cervical cancer is often associated with human papillomavirus (HPV) infection.
  • The biological roles of IRF-1 in cervical carcinogenesis are under investigation.

Purpose of the Study:

  • To investigate the functional association between HPV E7 and IRF-1.
  • To elucidate the mechanism by which HPV E7 influences IRF-1 activity.
  • To explore the role of histone deacetylase (HDAC) in this interaction.

Main Methods:

  • Binding assays (in vivo and in vitro) to detect physical interaction between IRF-1 and HPV E7.
  • Transient co-expression studies in NIH-3T3 cells to assess promoter activation.
  • Co-transfection with E7 mutants to identify functional domains.
  • Treatment with trichostatin A (HDAC inhibitor) to evaluate the role of HDAC.

Main Results:

  • HPV E7 physically interacts with IRF-1, requiring the carboxyl-terminal transactivation domain of IRF-1.
  • E7 inhibits IRF-1-mediated activation of the IFN-beta promoter.
  • The pRb-binding domain of E7 is essential for IRF-1 inactivation.
  • HDAC recruitment by E7's zinc finger domain is involved in IRF-1 inactivation.
  • HDAC inhibition by trichostatin A reverses E7-mediated repression of IRF-1.

Conclusions:

  • HPV E7 interferes with IRF-1 transactivation function by recruiting HDAC to the promoter.
  • This mechanism may contribute to immune evasion in cervical cancer.
  • The findings provide insights into HPV-mediated carcinogenesis and immune evasion strategies.

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