Dynamic FoxO transcription factors

Haojie Huang, Donald J. Tindall

Research output: Contribution to journalComment/debatepeer-review

786 Scopus citations


Forkhead box O (FoxO) transcription factors FoxOl, FoxO3a, FoxO4 and FoxO6, the mammalian orthologs of Caenorhabditis elegans DAF-16, are emerging as an important family of proteins that modulate the expression of genes involved in apoptosis, the cell cycle, DNA damage repair, oxidative stress, cell differentiation, glucose metabolism and other cellular functions. FoxO proteins are regulated by multiple mechanisms. They undergo inhibitory phosphorylation by protein kinases such as Akt, SGK, IKK and CDK2 in response to external and internal stimuli. By contrast, they are activated by upstream regulators such as JNK and MST1 under stress conditions. Their activities are counterbalanced by the acetylases CBP and p300 and the deacetylase SIRT1. Also, whereas polyubiquitylation of FoxO1 and FoxO3a leads to their degradation by the proteasome, monoubiquitylation of FoxO4 facilitates its nuclear localization and augments its transcriptional activity. Thus, the potent functions of FoxO proteins are tightly controlled by complex signaling pathways under physiological conditions; dysregulation of these proteins may ultimately lead to disease such as cancer.

Original languageEnglish (US)
Pages (from-to)2479-2487
Number of pages9
JournalJournal of cell science
Issue number15
StatePublished - Aug 1 2007


  • Akt
  • CDK2
  • Cancer
  • FoxO
  • Phosphorylation
  • Ubiquitylation

ASJC Scopus subject areas

  • Cell Biology


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