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Beta-catenin signaling: linking renal cell carcinoma and polycystic kidney disease

Benedetta Peruzzi1, Donald P Bottaro

  • 1Urologic Oncology Branch, CCR, NCI, Bethesda, Maryland 20892-1107, USA.

Cell Cycle (Georgetown, Tex.)
|January 16, 2007
PubMed

Insights

Loss of the von Hippel-Lindau (VHL) tumor suppressor gene drives renal cell carcinoma (RCC) by affecting hypoxia response and cell growth pathways. This involves aberrant regulation of beta-catenin and hepatocyte growth factor signaling.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Loss of the von Hippel-Lindau (VHL) tumor suppressor gene is a key event in familial and sporadic renal cell carcinoma (RCC).
  • The precise molecular mechanisms linking VHL loss to tumorigenesis, including aberrant gene expression controlling proliferation, invasion, and angiogenesis, are under investigation.
  • pVHL, the VHL gene product, functions within an E3 ubiquitin ligase complex targeting hypoxia-inducible factors for degradation, suggesting a role for hypoxia response pathways in RCC.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which VHL loss contributes to renal cell carcinoma (RCC) oncogenesis.
  • To investigate the role of VHL in repressing developmental hepatocyte growth factor (HGF) responses in the adult kidney.
  • To explore the connection between VHL, beta-catenin, and the pathogenesis of polycystic kidney disease.

Main Methods:

  • Analysis of the E3 ubiquitin ligase complex activity of pVHL.
  • Investigating the degradation targets of the VHL-containing E3 ligase complex, including hypoxia-inducible factors and beta-catenin.
  • Studying the impact of VHL loss on renal cell carcinoma cell invasiveness and morphogenesis in response to HGF.

Main Results:

  • VHL loss results in the aberrant expression of genes involved in cell proliferation, invasion, and angiogenesis.
  • pVHL targets hypoxia-inducible factors for proteasomal degradation, implicating hypoxia response genes in RCC.
  • pVHL represses developmental HGF responses in the adult kidney by targeting beta-catenin, linking VHL to HGF signaling and RCC pathogenesis.

Conclusions:

  • VHL loss is a critical driver of renal cell carcinoma through dysregulation of hypoxia response and HGF signaling pathways.
  • The identification of beta-catenin as an E3 ligase target further unifies understanding of VHL's role in RCC and polycystic kidney disease.
  • Understanding these molecular pathways provides insights into kidney development, homeostasis, and oncogenesis.

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