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Dynamic FoxO transcription factors

Haojie Huang1, Donald J Tindall

  • 1Cancer Center and Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN 55455, USA. huang253@umn.edu

Journal of Cell Science
|July 25, 2007
PubMed

Insights

Forkhead box O (FoxO) transcription factors regulate vital cellular functions, including apoptosis and metabolism. Their complex regulation by signaling pathways is crucial for preventing diseases like cancer.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Forkhead box O (FoxO) transcription factors (FoxO1, FoxO3a, FoxO4, FoxO6) are key regulators of cellular processes.
  • These proteins are mammalian orthologs of Caenorhabditis elegans DAF-16.
  • They control genes involved in apoptosis, cell cycle, DNA repair, oxidative stress, differentiation, and metabolism.

Purpose of the Study:

  • To elucidate the regulatory mechanisms governing FoxO protein activity.
  • To understand the role of FoxO signaling in maintaining cellular homeostasis.
  • To highlight the implications of FoxO dysregulation in disease.

Main Methods:

  • Review of signaling pathways affecting FoxO proteins.
  • Analysis of post-translational modifications (phosphorylation, ubiquitination) of FoxO factors.
  • Examination of interactions with regulatory enzymes (kinases, acetylases, deacetylases).

Main Results:

  • FoxO proteins are regulated by inhibitory phosphorylation (e.g., Akt, CDK2) and activating signals (e.g., JNK, MST1).
  • Their activity is modulated by acetylation (CBP, p300) and deacetylation (SIRT1).
  • Ubiquitylation impacts FoxO stability and localization, affecting transcriptional activity.

Conclusions:

  • FoxO protein functions are tightly controlled by intricate signaling networks.
  • Dysregulation of FoxO pathways can contribute to the development of diseases, including cancer.

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