Nerve regeneration by human corneal stromal keratocytes and stromal fibroblasts

Sci Rep. 2017 Mar 28;7:45396. doi: 10.1038/srep45396.

Abstract

Laser refractive surgeries reshape corneal stroma to correct refractive errors, but unavoidably affect corneal nerves. Slow nerve regeneration and atypical neurite morphology cause desensitization and neuro-epitheliopathy. Following injury, surviving corneal stromal keratocytes (CSKs) are activated to stromal fibroblasts (SFs). How these two different cell types influence nerve regeneration is elusive. Our study evaluated the neuro-regulatory effects of human SFs versus CSKs derived from the same corneal stroma using an in vitro chick dorsal root ganglion model. The neurite growth was assessed by a validated concentric circle intersection count method. Serum-free conditioned media (CM) from SFs promoted neurite growth dose-dependently, compared to that from CSKs. We detected neurotrophic and pro-inflammatory factors (interleukin-8, interleukin-15, monocyte chemoattractant protein-1, eotaxin, RANTES) in SFCM by Bio-Plex Human Cytokine assay. More than 130 proteins in SFCM and 49 in CSKCM were identified by nanoLC-MS/MS. Proteins uniquely present in SFCM had reported neuro-regulatory activities and were predicted to regulate neurogenesis, focal adhesion and wound healing. Conclusively, this was the first study showing a physiological relationship between nerve growth and the metabolically active SFs versus quiescent CSKs from the same cornea source. The dose-dependent effect on neurite growth indicated that nerve regeneration could be influenced by SF density.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Proliferation / physiology
  • Cells, Cultured
  • Chick Embryo
  • Cornea / cytology
  • Cornea / growth & development*
  • Corneal Keratocytes / cytology*
  • Culture Media, Conditioned / pharmacology
  • Ganglia, Spinal / cytology*
  • Humans
  • Keratomileusis, Laser In Situ / adverse effects
  • Nerve Regeneration / physiology*
  • Neurites / physiology
  • Stromal Cells / cytology*

Substances

  • Culture Media, Conditioned