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Effects of HER2 overexpression on cell signaling networks governing proliferation and migration

Alejandro Wolf-Yadlin1, Neil Kumar, Yi Zhang

  • 1Biological Engineering Division, MIT, Cambridge, MA, USA.

Molecular Systems Biology
|October 4, 2006
PubMed

Insights

Human epidermal growth factor receptor 2 (HER2) overexpression impacts cancer progression. This study reveals how HER2 affects cell signaling pathways, influencing proliferation and migration in response to growth factors.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Human epidermal growth factor receptor 2 (HER2) overexpression is linked to tumor progression in various cancers.
  • The precise mechanisms by which HER2 dysregulates signaling networks controlling cell behavior remain unclear.

Purpose of the Study:

  • To investigate the dynamic effects of HER2 overexpression on phosphotyrosine signaling networks.
  • To understand how HER2 influences cell proliferation and migration in response to epidermal growth factor (EGF) and heregulin (HRG).

Main Methods:

  • Quantitative mass spectrometry was employed to analyze phosphotyrosine signaling in HER2-overexpressing human mammary epithelial cells.
  • Self-organizing map and partial least-squares regression analyses were used to model phosphoproteomic data and correlate signaling with cell behavior.

Main Results:

  • EGF stimulation in HER2-overexpressing cells activated multiple migration-promoting pathways.
  • HRG stimulation amplified a specific subset of the migration signaling network.
  • Specific phosphorylation sites were identified that critically regulate cell proliferation and migration.

Conclusions:

  • HER2 overexpression differentially regulates signaling network modules in response to EGF and HRG.
  • EGFR family dimerization is associated with the activation of key phosphorylation sites impacting cell proliferation and migration.

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