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Notch3 cooperates with the EGFR pathway to modulate apoptosis through the induction of bim

J Konishi1, F Yi, X Chen

  • 1Division of Hematology and Medical Oncology, Vanderbilt University Medical Center, Nashville, TN, USA.

Oncogene
|November 3, 2009
PubMed

Insights

Notch3 signaling in lung cancer regulates Bim, a protein crucial for apoptosis. Inhibiting Notch3 and the epidermal growth factor receptor (EGFR)-mitogen-activated protein kinase (MAPK) pathway together enhances tumor suppression by modulating Bim.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Notch signaling is vital in embryonic development and cancer.
  • Notch3 plays a role in lung cancer pathogenesis, with its inhibition causing tumor apoptosis and growth suppression.
  • Cross-talk between Notch3 and the epidermal growth factor receptor (EGFR)-mitogen-activated protein kinase (MAPK) pathways suggests cooperative roles in cancer progression.

Purpose of the Study:

  • To elucidate the mechanism by which Notch3 and EGFR-MAPK pathways cooperate in modulating apoptosis.
  • To investigate the role of Bim, a BH-3-only protein, in Notch3-mediated apoptosis in lung cancer.

Main Methods:

  • Utilized gamma-secretase inhibitor and erlotinib in a xenograft model.
  • Investigated the regulation of Bim expression by Notch3 via MAPK signaling.
  • Assessed tumor apoptosis and growth suppression following pathway inhibition.

Main Results:

  • Notch3 was found to regulate Bim expression through MAPK signaling.
  • Loss of Bim expression abrogated tumor apoptosis induced by Notch3 inhibition.
  • Combined inhibition of Notch3 and EGFR-MAPK pathways synergistically enhanced Bim induction and tumor inhibition in vivo.

Conclusions:

  • Notch3 plays a critical role in lung cancer by regulating apoptosis.
  • Notch3 cooperates with the EGFR-MAPK pathway in modulating Bim, offering potential therapeutic targets.
  • Dual targeting of Notch3 and EGFR-MAPK pathways demonstrates synergistic effects in lung cancer suppression.

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