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Runx3 protects gastric epithelial cells against epithelial-mesenchymal transition-induced cellular plasticity and

Dominic Chih-Cheng Voon1, Huajing Wang, Jason Kin Wai Koo

  • 1The Cancer Biology Program, Cancer Science Institute of Singapore, National University of Singapore, Singapore.

Stem Cells (Dayton, Ohio)
|August 18, 2012
PubMed

Insights

Loss of the RUNX3 tumor suppressor in gastric cells triggers epithelial-mesenchymal transition (EMT), creating stem-like cells. This RUNX3 loss activates both TGF-β and Wnt pathways, promoting gastric cancer progression.

Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Cancer Research

Background:

  • RUNX3 is a tumor suppressor in the gastrointestinal epithelium.
  • Loss of RUNX3 is an early event in carcinogenesis.
  • RUNX3 regulates TGF-β signaling and Wnt pathways, but its role in cellular changes post-loss is unclear.

Purpose of the Study:

  • To investigate the cellular consequences of RUNX3 loss in gastric epithelial cells.
  • To understand the contribution of these changes to tumorigenicity.
  • To elucidate the roles of TGF-β and Wnt pathways in RUNX3-deficient gastric cells.

Main Methods:

  • Analysis of Runx3(-/-) p53(-/-) gastric epithelial cells.
  • Assessment of epithelial-mesenchymal transition (EMT) markers.
  • Evaluation of Lgr5 expression as a gastric stem cell marker.
  • Investigation of TGF-β and Wnt pathway signaling.

Main Results:

  • Loss of Runx3 in gastric epithelial cells induced spontaneous EMT.
  • A tumorigenic, stem cell-like subpopulation expressing Lgr5 emerged.
  • Runx3(-/-) p53(-/-) cells showed enhanced sensitivity to TGF-β-induced EMT.
  • Wnt pathway activation further increased Lgr5 induction during EMT.

Conclusions:

  • RUNX3 loss promotes gastric tumorigenicity through EMT and stemness.
  • RUNX3 loss dysregulates TGF-β and Wnt pathways, leading to cellular plasticity.
  • RUNX3 plays a crucial role in protecting gastric epithelium from aberrant signaling and maintaining cellular stability.

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