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TGF-β Tumor Suppression through a Lethal EMT

Charles J David1, Yun-Han Huang1, Mo Chen2

  • 1Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.

Cell
|February 23, 2016
PubMed

Insights

Transforming growth factor-beta (TGF-β) signaling has dual roles in cancer. In pancreatic cancer, TGF-β induces a lethal epithelial-mesenchymal transition (EMT) by disrupting a key transcriptional network, promoting apoptosis.

Area of Science:

  • Molecular biology
  • Cancer research
  • Cell signaling

Background:

  • Transforming growth factor-beta (TGF-β) signaling exhibits dual roles in tumorigenesis, acting as either pro-tumorigenic or tumor-suppressive.
  • Pancreatic ductal adenocarcinoma (PDA) and other gastrointestinal cancers frequently display inactivation of Smad4, a key mediator of TGF-β signaling.
  • The epithelial-mesenchymal transition (EMT) is typically associated with promoting cancer progression.

Purpose of the Study:

  • To investigate the dual role of TGF-β signaling in pancreatic ductal adenocarcinoma (PDA).
  • To elucidate the mechanisms by which TGF-β signaling influences tumorigenesis and cell fate in PDA.
  • To understand the interplay between Smad4, EMT, and transcription factors in PDA.

Main Methods:

  • Investigated TGF-β signaling pathways in PDA cells.
  • Analyzed the induction of epithelial-mesenchymal transition (EMT) by TGF-β.
  • Examined the role of Smad4, Sox4, and Klf5 in PDA cell behavior.
  • Studied the impact of EMT on the transcription factor landscape.

Main Results:

  • TGF-β induces EMT in PDA cells, which paradoxically promotes apoptosis by converting Sox4 from a tumorigenesis enforcer to an apoptosis promoter.
  • EMT disrupts the transcriptional landscape, repressing the gastrointestinal master regulator Klf5, which normally cooperates with Sox4 in oncogenesis.
  • Smad4 is essential for EMT but not for TGF-β-induced Sox4 upregulation, indicating a dissociation of these pathways.

Conclusions:

  • TGF-β exerts tumor suppressive functions in PDA through an EMT-mediated disruption of a critical lineage-specific transcriptional network.
  • The interplay between EMT and transcription factors like Sox4 and Klf5 dictates cell fate in PDA.
  • Understanding these complex signaling interactions is crucial for developing targeted therapies for pancreatic cancer.

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