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Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells
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Published on: March 9, 2012

Functional Rac-1 and Nck signaling networks are required for FGF-2-induced DNA synthesis in MCF-7 cells

J F Liu1, E Chevet, S Kebache

  • 1Department of Anatomy and Cell Biology, McGill University, Montreal, QC, Canada.

Oncogene
|December 22, 1999
PubMed

Insights

Fibroblast Growth Factor-2 (FGF-2) impacts breast cancer cell DNA synthesis. FGF-2 requires Ras/MAPK cascade activation, Rac-1, and Nck signaling for DNA synthesis induction in MCF-7 cells.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Oncology

Background:

  • The role of Fibroblast Growth Factor-2 (FGF-2) in breast cancer cell DNA synthesis is debated.
  • Understanding FGF-2 signaling pathways is crucial for elucidating its effects on cancer progression.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying FGF-2's influence on DNA synthesis in breast cancer cells.
  • To analyze FGF-2 signaling pathways in MCF-7 and MCF-7ras cells.

Main Methods:

  • Analysis of FGF-2 signaling pathways.
  • Utilized MCF-7 and MCF-7ras breast cancer cell lines.
  • Assessed Ras activation, FRS-2 phosphorylation, p66Shc expression, Nck-associated protein phosphorylation, and JNK activation.

Main Results:

  • FGF-2-induced DNA synthesis correlated with transient Ras activation, FRS-2 tyrosine phosphorylation, and low p66Shc expression.
  • Nck-associated proteins showed high tyrosine phosphorylation, and JNK activation increased when FGF-2 triggered DNA synthesis.
  • FGF-2 treatment demonstrated that JNK activation and DNA synthesis are dependent on Rac-1 activity.

Conclusions:

  • FGF-2 induction of DNA synthesis in MCF-7 cells necessitates a transient Ras/MAPK cascade activation.
  • This study is the first to demonstrate the requirement of intact Rac-1 and Nck signaling networks for FGF-2-mediated DNA synthesis.

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