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Activation of the c-Met receptor complex in fibroblasts drives invasive cell behavior by signaling through

Alexander Cramer1, Sandra Kleiner, Martin Westermann

  • 1Institute of Biochemistry I, Friedrich Schiller University Jena, Nonnenplan 2, 07743 Jena, Germany.

Journal of Cellular Biochemistry
|April 20, 2005
PubMed

Insights

Signal transducer and activator of transcription 3 (STAT3) is crucial for c-Met-driven cell invasiveness. Inhibiting STAT3 significantly reduces the metastatic properties of cancer cells, highlighting its role in malignant transformation.

Area of Science:

  • Cell Biology
  • Molecular Oncology
  • Signal Transduction

Background:

  • c-Met receptor tyrosine kinase, activated by hepatocyte growth factor/scatter factor (HGF/SF), plays a key role in cell growth, motility, and survival.
  • Aberrant c-Met signaling is implicated in various cancers, promoting tumor growth, invasion, and metastasis.
  • Signal transducer and activator of transcription 3 (STAT3) is a transcription factor involved in cellular processes like proliferation, survival, and immune response, and has been linked to c-Met-mediated cell motility.

Purpose of the Study:

  • To investigate the role of STAT3 in c-Met-mediated cell invasiveness using a reconstituted signaling system.
  • To explore the molecular mechanisms underlying Met-driven cell invasion and the involvement of STAT3.

Main Methods:

  • A heterologous signaling system was established in fibroblasts using a hybrid Trk-Met receptor and Gab1-GFP.
  • Ligand-induced activation was achieved using nerve growth factor (NGF).
  • Cell invasiveness, anchorage-independent growth, STAT3 activation (tyrosine phosphorylation, clustering), and receptor complex formation were analyzed using techniques including siRNA, freeze-fracture cytochemistry, and electron microscopy.

Main Results:

  • NGF stimulation of Trk-Met expressing fibroblasts induced anchorage-independent growth and enhanced invasiveness.
  • Ligand-induced receptor complex assemblies were visualized in the cell membrane.
  • STAT3 activation, evidenced by tyrosine phosphorylation and clustering at the cell membrane, was observed upon NGF stimulation.
  • siRNA-mediated knockdown of STAT3 significantly reduced c-Met-driven invasiveness.

Conclusions:

  • STAT3 plays a critical role in mediating c-Met-driven cell invasiveness.
  • The findings highlight STAT3 as a potential therapeutic target for inhibiting cancer cell metastasis.

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