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Updated: Aug 17, 2026

Induction and Testing of Hypoxia in Cell Culture
07:01

Induction and Testing of Hypoxia in Cell Culture

Published on: August 12, 2011

Silencing of epidermal growth factor receptor suppresses hypoxia-inducible factor-2-driven VHL-/- renal cancer

Karlene Smith1, Lakshman Gunaratnam, Melissa Morley

  • 1Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada.

Cancer Research
|June 17, 2005
PubMed

Insights

Inactivating mutations in the von Hippel-Lindau (VHL) gene drive kidney cancer by activating hypoxia-inducible factor (HIF). Inhibiting the epidermal growth factor receptor (EGFR) pathway halts VHL-deficient renal cell carcinoma (RCC) tumor growth.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Inactivating mutations in the von Hippel-Lindau (VHL) tumor suppressor gene are linked to clear cell renal cell carcinoma (VHL-/- RCC).
  • The VHL protein normally targets hypoxia-inducible factor (HIF) for degradation; its loss leads to constitutive HIF activation and tumorigenesis.
  • HIF activation of the transforming growth factor-alpha/epidermal growth factor receptor (TGF-alpha/EGFR) pathway was previously reported in VHL-defective RCC cells.

Purpose of the Study:

  • To investigate the role of the epidermal growth factor receptor (EGFR) pathway in VHL-deficient renal cell carcinoma (RCC) tumorigenesis.
  • To determine if EGFR inhibition can suppress tumor growth driven by hypoxia-inducible factor (HIF).
  • To identify EGFR as a potential therapeutic target for VHL-/- RCC.

Main Methods:

  • Utilized short hairpin RNA (shRNA) and small interfering RNA (siRNA) to inhibit EGFR in VHL-/- RCC cell lines.
  • Assessed the impact of EGFR inhibition on HIF-dependent tumorigenesis in vitro (2D culture, 3D spheroid formation) and in vivo.
  • Analyzed the effects of EGFR silencing on HIF target gene expression and fibronectin deposition.

Main Results:

  • EGFR inhibition using shRNA was sufficient to abolish HIF-dependent tumorigenesis in multiple VHL-/- RCC cell lines.
  • HIF-2alpha, not HIF-1alpha, was identified as the driver of VHL-/- RCC tumorigenesis via the TGF-alpha/EGFR pathway.
  • EGFR silencing prevented autonomous growth and spheroid formation in vitro and significantly inhibited in vivo tumor growth, despite not altering other VHL loss-associated characteristics.

Conclusions:

  • EGFR is a critical determinant of HIF-2alpha-driven tumorigenesis in VHL-/- RCC.
  • EGFR remains a viable therapeutic target for VHL-deficient renal cell carcinoma.
  • Targeting the EGFR pathway offers a promising strategy for treating VHL-/- RCC.

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