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c-Src regulates cell cycle proteins expression through protein kinase B/glycogen synthase kinase 3 beta and

Xiang Liu1, Liying Du, Renqing Feng

  • 1Department of Biochemistry and Molecular Biology, College of Life Sciences, Peking University, Beijing 100871, China.

Acta Biochimica Et Biophysica Sinica
|April 26, 2013
PubMed

Insights

c-Src suppression inhibits cell cycle progression in breast cancer by down-regulating cyclin D1/E and up-regulating p27 Kip1. This occurs via the AKT/GSK3β and ERK1/2 signaling pathways.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • c-Src is implicated in epithelial to mesenchymal transition in breast cancer.
  • Understanding c-Src's role in cell cycle regulation is crucial for cancer therapy.

Purpose of the Study:

  • To investigate the role of c-Src in cell cycle progression.
  • To elucidate the signaling pathways involved in c-Src-mediated cell cycle regulation.

Main Methods:

  • Utilized small molecule inhibitor PP2 and siRNAs to suppress c-Src.
  • Performed Western blot analysis for cell cycle proteins (cyclin D1, cyclin E, p27 Kip1).
  • Assessed phosphorylation of key signaling molecules (ERK1/2, AKT, GSK3β) and used pathway-specific inhibitors.

Main Results:

  • c-Src suppression led to decreased cyclin D1/E and increased p27 Kip1 expression.
  • PP2 treatment inhibited phosphorylation of ERK1/2, AKT, and GSK3β.
  • Inhibition of AKT/GSK3β or ERK1/2 pathways mimicked the effects of c-Src suppression on cell cycle proteins.

Conclusions:

  • c-Src plays a significant role in regulating breast cancer cell cycle progression.
  • The AKT/GSK3β and ERK1/2 signaling pathways are critical mediators of c-Src's effects on cell cycle proteins.
  • Targeting c-Src may represent a viable therapeutic strategy for breast cancer.
Keywords:
PP2breast cancerc-Src suppressioncell cycle proteinssiRNAs

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