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Regulation of ΔNp63α by NFκΒ

Tanusree Sen1, Xiaofei Chang, David Sidransky

  • 1Department of Otolaryngology-Head and Neck Surgery, Division of Head and Neck Cancer Research, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Cell Cycle (Georgetown, Tex.)
|November 20, 2010
PubMed

Insights

NF-κB activation triggers the degradation of ΔNp63α, a key survival factor in head and neck cancer. This process enhances the cellular response to DNA damage, making cancer cells more susceptible to chemotherapy.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cellular Biology

Background:

  • ΔNp63α is a crucial survival factor in head and neck squamous cell carcinoma.
  • ΔNp63α expression is downregulated by DNA-damaging agents, facilitating cellular responses to genotoxicity.

Purpose of the Study:

  • To elucidate the molecular mechanism regulating ΔNp63α expression under chemotherapeutic treatment.
  • To investigate the role of NF-κB in the degradation of ΔNp63α.

Main Methods:

  • Studied the interaction between ΔNp63α and NF-κB in cisplatin-treated cells.
  • Utilized siRNA-mediated silencing to inhibit NF-κB expression.
  • Assessed the impact of NF-κB modulation on ΔNp63α levels and p53 family-induced gene expression.

Main Results:

  • ΔNp63α interacts with NF-κB in the presence of cisplatin.
  • NF-κB promotes the ubiquitin-mediated proteasomal degradation of ΔNp63α.
  • Chemotherapy-induced NF-κB activation leads to ΔNp63α degradation and enhanced trans-activation of DNA damage response genes.

Conclusions:

  • NF-κB plays a critical role in regulating ΔNp63α levels in response to extrinsic stimuli like chemotherapy.
  • NF-κB-mediated reduction of ΔNp63α levels sensitizes cancer cells to DNA damage and promotes cell death.

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