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Updated: Feb 24, 2026

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
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Silencing of TGF-β1 in tumor cells impacts MMP-9 in tumor microenvironment

Lakisha D Moore-Smith1, Tatyana Isayeva1, Joo Hyoung Lee1

  • 1Department of Pathology, The University of Alabama at Birmingham, Birmingham, AL, 35294, USA.

Scientific Reports
|August 19, 2017
PubMed

Insights

Transforming growth factor-beta 1 (TGF-β1) drives tumor progression. Abrogating TGF-β1 in cancer cells reduced MMP-9 expression and fibroblast proliferation, impacting tumor growth.

Area of Science:

  • Oncology
  • Cell Biology
  • Cancer Research

Background:

  • Transforming growth factor-beta 1 (TGF-β1) plays a critical role in the tumor microenvironment (TME).
  • TGF-β1 influences both autocrine and paracrine signaling pathways.
  • Understanding TGF-β1's role is crucial for targeting tumor formation and progression.

Purpose of the Study:

  • To investigate the effects of TGF-β1 crosstalk within the TME.
  • To determine TGF-β1's role in mediating tumor formation and progression.
  • To examine the impact of targeted TGF-β1 abrogation in metastatic cells.

Main Methods:

  • Utilized species-specific primers to analyze gene expression.
  • Conducted co-culture experiments with tumor cells and cancer-associated fibroblasts (CAFs).
  • Performed in vivo co-implantation studies of CAFs and tumor cells with and without TGF-β1 expression.

Main Results:

  • Significant increase in matrix metalloproteinase-9 (MMP-9) gene expression in tumor-reactive stroma during late-stage lung metastasis.
  • Knockdown of TGF-β1 in tumor cells reduced MMP-9 gene expression.
  • TGF-β1 from tumor cells significantly increased fibroblast proliferation and expression of VEGF, bFGF, and SDF-1, promoting tumor growth.

Conclusions:

  • TGF-β1 signaling is a key mediator of tumor progression and TME modulation.
  • Targeting TGF-β1 in tumor cells can inhibit pro-tumorigenic factors and fibroblast activation.
  • Further investigation into TGF-β receptor signaling in tumor cells is warranted.

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