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Mind the GAP: Wnt steps onto the mTORC1 train

Andrew Y Choo1, Philippe P Roux, John Blenis

  • 1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.

Cell
|September 9, 2006
PubMed

Insights

The TSC1/2 complex regulates protein synthesis via mTOR. Kinases GSK3 and AMPK activate TSC2 to inhibit mTOR, but Wnt signaling surprisingly suppresses this GSK3 action, suggesting mTOR as a target for Wnt-related diseases.

Area of Science:

  • Molecular biology
  • Cell signaling
  • Oncology

Background:

  • The TSC1/2 complex is a critical tumor suppressor.
  • It regulates protein synthesis by controlling mTOR activity.

Purpose of the Study:

  • To investigate the upstream regulators of the TSC1/2 complex.
  • To explore the interplay between Wnt signaling and the mTOR pathway.

Main Methods:

  • Biochemical assays to study protein phosphorylation.
  • Analysis of kinase activity (GSK3, AMPK).
  • Investigation of Wnt signaling effects on TSC2.

Main Results:

  • GSK3 and AMPK kinases cooperate to activate TSC2, inhibiting mTOR.
  • Wnt signaling significantly suppresses the phosphorylation of TSC2 by GSK3.
  • This reveals a novel regulatory mechanism for mTOR.

Conclusions:

  • The findings elucidate a new pathway controlling mTOR activity.
  • The cross-talk between Wnt signaling and TSC1/2-mTOR suggests therapeutic strategies.
  • Targeting mTOR components may be beneficial for diseases associated with aberrant Wnt signaling.

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