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Differential regulation of tumor angiogenesis by distinct ErbB homo- and heterodimers

Lily Yen1, Naciba Benlimame, Zeng-Rong Nie

  • 1Lady Davis Institute for Medical Research of the Sir Mortimer B Davis Jewish General Hospital, Department of Medicine and McGill Centre for Translational Research in Cancer, McGill University, Montreal, Quebec, H3T 1E2, Canada.

Molecular Biology of the Cell
|November 14, 2002
PubMed

Insights

The ErbB receptor family, including EGFR, ErbB-2, ErbB-3, and ErbB-4, significantly influences tumor angiogenesis. Specific heterodimers like EGFR/ErbB-2 and ErbB-2/ErbB-3 are potent inducers of vascular endothelial growth factor (VEGF) in solid tumors.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Tumor microenvironment interactions are crucial for solid tumor progression.
  • The ErbB receptor tyrosine kinase family plays a significant role in cancer cell signaling.

Purpose of the Study:

  • To investigate the role of all ErbB receptor tyrosine kinases (EGFR, ErbB-2, ErbB-3, ErbB-4) in regulating angiogenesis.
  • To identify specific ErbB receptor combinations that influence vascular endothelial growth factor (VEGF) expression and tumor vascularity.

Main Methods:

  • In vitro and in vivo studies of ErbB receptor combinations.
  • Analysis of VEGF mRNA expression and transcription.
  • Immunohistochemistry of tumor xenografts.
  • Deletional and mutational analysis of the VEGF promoter.
  • Assessment of extracellular signal-related protein kinases activity.

Main Results:

  • EGFR/ErbB-2 and ErbB-2/ErbB-3 heterodimers are the most potent inducers of VEGF mRNA expression.
  • Tumor xenografts overexpressing these heterodimers show increased VEGF expression and enhanced vascularity.
  • ErbB-mediated VEGF up-regulation involves a hypoxia-inducible factor 1-independent region of the VEGF promoter, requiring Sp-1 and AP-2 transcription factors and extracellular signal-related protein kinases activity.

Conclusions:

  • The diversity of ErbB receptor signaling significantly impacts tumor microenvironment regulation.
  • Specific ErbB heterodimers are key regulators of tumor angiogenesis through VEGF induction.
  • Targeting specific ErbB receptor interactions may offer novel therapeutic strategies for solid tumors.

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