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Akt regulates drug-induced cell death through Bcl-w downregulation

Michela Garofalo1, Cristina Quintavalle, Ciro Zanca

  • 1Department of Cellular and Molecular Biology and Pathology, Federico II University of Naples, Naples, Italy.

Plos One
|December 31, 2008
PubMed

Insights

The Akt pathway regulates cell survival by interacting with Bcl-w, a protein crucial for preventing apoptosis. This interaction modulates Bcl-w levels, influencing cell survival signals in cancer.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Akt (also known as Protein Kinase B) is a key signaling molecule involved in cell survival and apoptosis.
  • The Bcl-2 family, including Bcl-w, plays a critical role in regulating programmed cell death.
  • Understanding novel interactions within these pathways is vital for cancer research.

Purpose of the Study:

  • To identify new proteins that interact with Akt and are involved in cell survival.
  • To elucidate the functional relationship between Akt and its novel interactors.

Main Methods:

  • Yeast two-hybrid screening using human Akt as bait and a murine cDNA library.
  • Confirmation of protein-protein interaction via immunoprecipitation assays.
  • Functional studies involving modulation of Akt activity and protein levels.

Main Results:

  • Bcl-w was identified as a novel interactor of Akt.
  • Direct interaction between Akt and Bcl-w was confirmed.
  • Akt activity was shown to modulate the protein levels of Bcl-w.
  • Inhibition of Akt led to decreased Bcl-w, promoting apoptosis.

Conclusions:

  • Bcl-w is a new component of the Akt signaling pathway.
  • Akt promotes cell survival, at least partly by regulating Bcl-w's amount and activity.
  • This interaction offers potential therapeutic targets for cancers where Akt and Bcl-w are dysregulated.

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