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Mechanism of von Hippel-Lindau protein-mediated suppression of nuclear factor kappa B activity

Jiabin An1, Matthew B Rettig

  • 1Division of Hematology/Oncology, Department of Medicine, Veterans Affairs Greater Los Angeles Healthcare System-West Los Angeles, CA 90073, USA.

Molecular and Cellular Biology
|August 19, 2005
PubMed

Insights

Clear cell renal cell carcinoma (CCRCC) involves von Hippel-Lindau (VHL) gene mutations, leading to hypoxia-inducible factor alpha (HIFalpha) accumulation. This study reveals VHL loss activates nuclear factor kappa B (NF-kappaB) via HIFalpha, driving tumor growth and offering new therapeutic targets.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Biallelic inactivating mutations in the von Hippel-Lindau tumor suppressor gene (VHL) are characteristic of clear cell renal cell carcinoma (CCRCC).
  • VHL gene inactivation leads to the accumulation of hypoxia-inducible factor alpha (HIFalpha).
  • The precise downstream targets of HIFalpha driving renal carcinogenesis remain incompletely understood.

Purpose of the Study:

  • To elucidate the downstream molecular mechanisms by which VHL loss promotes renal carcinogenesis.
  • To investigate the role of hypoxia-inducible factor alpha (HIFalpha) and nuclear factor kappa B (NF-kappaB) signaling in VHL-deficient tumors.
  • To identify potential therapeutic targets within the VHL-NF-kappaB pathway in CCRCC.

Main Methods:

  • Analysis of VHL inactivation and its effect on HIFalpha accumulation.
  • Investigating the induction of nuclear factor kappa B (NF-kappaB) signaling downstream of HIFalpha.
  • Utilizing cell culture models to study the VHL-HIFalpha-NF-kappaB signaling cascade and its impact on tumor cell growth.

Main Results:

  • VHL loss induces HIFalpha accumulation, which in turn activates nuclear factor kappa B (NF-kappaB).
  • HIFalpha induces the expression of transforming growth factor alpha, initiating an EGFR/PI3K/AKT/IKKα/NF-kappaB signaling cascade.
  • Components of this identified signaling pathway are crucial for the proliferation of VHL-deficient tumor cells.

Conclusions:

  • VHL inactivation in CCRCC activates NF-kappaB signaling through HIFalpha accumulation.
  • The identified EGFR/PI3K/AKT/IKKα/NF-kappaB pathway is a key driver of tumor growth in VHL-deficient renal cancer.
  • Targeting components of this pathway presents a promising therapeutic strategy for VHL-mutated CCRCC.

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