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Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
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A zinc-finger transcription factor induced by TGF-beta promotes apoptotic cell death in epithelial Mv1Lu cells

E Chalaux1, T López-Rovira, J L Rosa

  • 1Departament Ciències Fisiològiques II, Campus de Bellvitge, Universitat de Barcelona, C/ Feixa Llarga s/n., 08907, Hospitalet de Llobregat, Spain.

FEBS Letters
|September 3, 1999
PubMed

Insights

Transforming growth factor-beta (TGF-beta) induces apoptosis by upregulating the TIEG gene. Overexpressing TIEG triggers cell death, which can be blocked by Bcl-2, suggesting TIEG mediates TGF-beta

Area of Science:

  • Cell biology
  • Molecular biology
  • Cancer research

Background:

  • Transforming growth factor-beta (TGF-beta) superfamily proteins are key regulators of cellular processes, including apoptosis.
  • Understanding the molecular mechanisms underlying TGF-beta-induced apoptosis is crucial for cancer therapy.

Purpose of the Study:

  • To investigate the role of the zinc-finger transcription factor TIEG in TGF-beta-mediated apoptosis.
  • To elucidate the relationship between TIEG, Bcl-2, and TGF-beta signaling in epithelial cells.

Main Methods:

  • Utilized the Mv1Lu epithelial cell line.
  • Investigated gene expression changes induced by TGF-beta.
  • Examined the effects of ectopic TIEG and Bcl-2 overexpression on apoptosis.
  • Assessed Bcl-2 protein levels.

Main Results:

  • TGF-beta transcriptionally induces the immediate early gene TIEG in Mv1Lu cells.
  • Ectopic TIEG overexpression triggers apoptosis, preceded by decreased Bcl-2 protein levels.
  • Co-expression of Bcl-2 prevents TIEG-induced apoptotic events.

Conclusions:

  • TIEG acts as an mediator in TGF-beta's pro-apoptotic function.
  • The TIEG-Bcl-2 axis is a critical component of TGF-beta-induced cell death pathways.

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