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pVHL and GSK3beta are components of a primary cilium-maintenance signalling network

Claudio R Thoma1, Ian J Frew, Christian R Hoerner

  • 1Institute of Cell Biology, ETH Zurich, 8093 Zurich, Switzerland.

Nature Cell Biology
|April 24, 2007
PubMed

Insights

Defects in primary cilia, crucial for suppressing kidney cell growth, are linked to VHL disease. The study reveals that pVHL and GSK3beta signaling pathway disruption causes cilia loss and promotes kidney cyst formation.

Area of Science:

  • Cell Biology
  • Genetics
  • Renal Medicine

Background:

  • Primary cilia are vital antennae-like structures regulating cell proliferation.
  • Defects in primary cilia are common in genetic kidney cyst disorders.
  • von Hippel-Lindau (VHL) disease involves inactivation of the VHL tumor suppressor gene (pVHL) and leads to renal cysts.

Purpose of the Study:

  • To elucidate the mechanisms maintaining primary cilia structure and function.
  • To investigate the role of pVHL and glycogen synthase kinase (GSK)3beta in primary cilia maintenance.
  • To understand how disruptions in this pathway contribute to VHL disease and kidney cystogenesis.

Main Methods:

  • Investigated the interplay between pVHL and GSK3beta in primary cilia maintenance.
  • Analyzed cilia frequency in VHL patient renal cysts and early VHL mutant lesions.
  • Examined the phosphorylation status of GSK3beta in VHL-associated renal cysts.

Main Results:

  • Combined inactivation of pVHL and GSK3beta leads to primary cilia loss.
  • GSK3beta undergoes inhibitory phosphorylation in VHL patient renal cysts, unlike early lesions.
  • VHL renal cysts exhibit significantly reduced primary cilia frequencies.

Conclusions:

  • pVHL and GSK3beta form a critical signaling network for primary cilia maintenance.
  • Disruption of this pVHL-GSK3beta pathway compromises cilia integrity.
  • Loss of primary cilia due to pathway dysfunction promotes kidney cyst formation in VHL disease.

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