Corneal Wound Healing Requires IKB kinase β Signaling in Keratocytes

PLoS One. 2016 Mar 17;11(3):e0151869. doi: 10.1371/journal.pone.0151869. eCollection 2016.

Abstract

IkB kinase β (IKKβ) is a key signaling kinase for inflammatory responses, but it also plays diverse cell type-specific roles that are not yet fully understood. Here we investigated the role of IKKβ in the cornea using Ikkβ(ΔCS) mice in which the Ikkβ gene was specifically deleted in the corneal stromal keratocytes. The Ikkβ(ΔCS) corneas had normal morphology, transparency and thickness; however, they did not heal well from mild alkali burn injury. In contrast to the Ikkβ(F/F) corneas that restored transparency in 2 weeks after injury, over 50% of the Ikkβ(ΔCS) corneas failed to fully recover. They instead developed recurrent haze with increased stromal thickness, severe inflammation and apoptosis. This pathogenesis correlated with sustained myofibroblast transformation with increased α smooth muscle actin (α-SMA) expression, higher levels of senescence β-Gal activity and scar tissue formation at the late stage of wound healing. In addition, the Ikkβ(ΔCS) corneas displayed elevated expression of hemo-oxygenase-1 (HO-1), a marker of oxidative stress, and activation of stress signaling pathways with increased JNK, c-Jun and SMAD2/3 phosphorylation. These data suggest that IKKβ in keratocytes is required to repress oxidative stress and attenuate fibrogenesis and senescence in corneal wound healing.

Publication types

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

MeSH terms

  • Animals
  • Apoptosis / physiology
  • Cornea / metabolism
  • Cornea / physiopathology
  • Corneal Injuries / complications
  • Corneal Injuries / physiopathology*
  • Corneal Keratocytes / metabolism
  • Corneal Keratocytes / physiology*
  • Corneal Opacity / etiology
  • Corneal Opacity / physiopathology
  • I-kappa B Kinase / physiology*
  • Mice
  • Mice, Knockout
  • Myofibroblasts / physiology
  • Oxidative Stress / physiology
  • Signal Transduction / physiology*
  • Wound Healing / physiology*

Substances

  • I-kappa B Kinase