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TBK1 directly engages Akt/PKB survival signaling to support oncogenic transformation

Yi-Hung Ou1, Michael Torres, Rosalyn Ram

  • 1Department of Cell Biology, UT Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA.

Molecular Cell
|February 19, 2011
PubMed

Insights

The innate immune kinase TBK1 directly activates AKT, a key survival protein, independently of known pathways. This discovery reveals a new target for cancer therapy by inhibiting TBK1 signaling.

Area of Science:

  • Immunology
  • Cell Biology
  • Cancer Biology

Background:

  • TBK1 is crucial for innate immunity and host defense.
  • Pathological TBK1 activation promotes cancer cell survival.
  • The mechanism of TBK1's prosurvival signaling was previously unclear.

Purpose of the Study:

  • To elucidate the mechanistic basis of TBK1-mediated prosurvival signaling.
  • To identify direct substrates of TBK1 involved in cell survival.
  • To explore pharmacological inhibition of TBK1 signaling in cancer.

Main Methods:

  • Phosphorylation site analysis of AKT.
  • Investigating TBK1 recruitment to the exocyst complex.
  • Utilizing a selective TBK1 inhibitor (6-aminopyrazolopyrimidine derivative).

Main Results:

  • TBK1 directly phosphorylates and activates AKT at canonical sites, independent of PDK1 and mTORC2.
  • TBK1 is recruited to the exocyst complex to activate AKT upon various stimuli, including oncogene activation.
  • TBK1-deficient cells exhibit impaired exocyst-dependent AKT activation.
  • A selective TBK1 inhibitor was identified, demonstrating pharmacological tractability.

Conclusions:

  • AKT is a direct substrate of TBK1, linking TBK1 to prosurvival signaling.
  • TBK1-dependent AKT activation represents a novel pathway for overcoming cell death cues in cancer.
  • Targeting TBK1 offers a potential therapeutic strategy for cancer treatment.

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