FOXO1 promotes wound healing through the up-regulation of TGF-β1 and prevention of oxidative stress

J Cell Biol. 2013 Oct 28;203(2):327-43. doi: 10.1083/jcb.201305074. Epub 2013 Oct 21.

Abstract

Keratinocyte mobilization is a critical aspect of wound re-epithelialization, but the mechanisms that control its precise regulation remain poorly understood. We set out to test the hypothesis that forkhead box O1 (FOXO1) has a negative effect on healing because of its capacity to inhibit proliferation and promote apoptosis. Contrary to expectations, FOXO1 is required for keratinocyte transition to a wound-healing phenotype that involves increased migration and up-regulation of transforming growth factor β1 (TGF-β1) and its downstream targets, integrin-α3 and -β6 and MMP-3 and -9. Furthermore, we show that FOXO1 functions in keratinocytes to reduce oxidative stress, which is necessary to maintain cell migration and prevent cell death in a TGF-β1-independent manner. Thus, our studies identify a novel function for FOXO1 in coordinating the response of keratinocytes to wounding through up-regulation of TGF-β1 and other factors needed for keratinocyte migration and protection against oxidative stress, which together promote migration and decrease apoptosis.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Apoptosis
  • Binding Sites
  • Cell Movement
  • Cell Proliferation
  • Cells, Cultured
  • Collagenases / metabolism
  • Forkhead Box Protein O1
  • Forkhead Transcription Factors / deficiency
  • Forkhead Transcription Factors / genetics
  • Forkhead Transcription Factors / metabolism*
  • Humans
  • Integrin alpha3 / metabolism
  • Integrin beta Chains / metabolism
  • Keratinocytes / metabolism*
  • Keratinocytes / pathology
  • Mice
  • Mice, Knockout
  • Oxidative Stress*
  • Promoter Regions, Genetic
  • RNA Interference
  • Signal Transduction
  • Smad Proteins / metabolism
  • Time Factors
  • Transcriptional Activation
  • Transfection
  • Transforming Growth Factor beta1 / genetics
  • Transforming Growth Factor beta1 / metabolism*
  • Up-Regulation
  • Wound Healing*

Substances

  • FOXO1 protein, human
  • Forkhead Box Protein O1
  • Forkhead Transcription Factors
  • Foxo1 protein, mouse
  • Integrin alpha3
  • Integrin beta Chains
  • Smad Proteins
  • TGFB1 protein, human
  • Tgfb1 protein, mouse
  • Transforming Growth Factor beta1
  • integrin beta6
  • Collagenases