Regulation of FOXO protein stability via ubiquitination and proteasome degradation

Haojie Huang, Donald J. Tindall

Research output: Contribution to journalArticle

106 Citations (Scopus)

Abstract

Forkhead box O-class (FOXO) proteins are evolutionally conserved transcription factors. They belong to a family of proteins consisting of FOXO1, FOXO3a, FOXO4 and FOXO6 in humans. Increasing evidence suggests that FOXO proteins function as tumor suppressors by transcriptionally regulating expression of genes involved in cell cycle arrest, apoptosis, DNA repair and oxidative stress resistance. Activation of various protein kinases, including Akt, IκB kinase (IKK) and ERK, leads to phosphorylation of FOXO proteins and their ubiquitination mediated by E3 ligases such as SKP2 and MDM2 in human primary tumors and cancer cell lines. As a result, the tumor suppressor functions of FOXO proteins are either diminished or abrogated due to their ubiquitination-proteasome degradation, thereby favoring cell transformation, proliferation and survival. Thus, ubiquitination and proteasome degradation of FOXO proteins play an important role in tumorigenesis and represent a viable target for cancer treatment. This article is part of a Special Issue entitled: PI3K-AKT-FoxO axis in cancer and aging.

Original languageEnglish (US)
Pages (from-to)1961-1964
Number of pages4
JournalBiochimica et Biophysica Acta - Molecular Cell Research
Volume1813
Issue number11
DOIs
StatePublished - Nov 2011

Fingerprint

Protein Stability
Ubiquitination
Proteasome Endopeptidase Complex
Neoplasms
Proteins
Ubiquitin-Protein Ligases
Cell Cycle Checkpoints
Tumor Cell Line
Phosphatidylinositol 3-Kinases
DNA Repair
Protein Kinases
Cell Survival
Carcinogenesis
Oxidative Stress
Transcription Factors
Phosphotransferases
Phosphorylation
Cell Proliferation
Apoptosis
Gene Expression

Keywords

  • Forkhead
  • FOXO
  • Proteasome
  • Tumor suppressor
  • Tumorigenesis
  • Ubiquitination

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology

Cite this

Regulation of FOXO protein stability via ubiquitination and proteasome degradation. / Huang, Haojie; Tindall, Donald J.

In: Biochimica et Biophysica Acta - Molecular Cell Research, Vol. 1813, No. 11, 11.2011, p. 1961-1964.

Research output: Contribution to journalArticle

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