Nerve growth factor effect on human primary fibroblastic-keratocytes: possible mechanism during corneal healing

Exp Eye Res. 2006 Oct;83(4):747-57. doi: 10.1016/j.exer.2006.03.010. Epub 2006 May 23.

Abstract

In response to corneal injury, cytokines and growth factors play a crucial role by influencing epithelial-stromal interaction during the healing and reparative processes which may resolve in tissue remodeling and fibrosis. While transforming growth factor-beta1 (TGF-beta1) is considered the main profibrogenic modulator of these process, recently the nerve growth factor (NGF) appears as a pleiotropic modulator of wound-healing and inflammatory responses. Interestingly in the cornea, where NGF, trkA(NGFR) and p75(NTR) are expressed by epithelial cells and keratocytes, the NGF eye-drop induces the healing of neurotrophic or autoimmune corneal ulcers. During corneal healing, quiescent keratocytes are replaced by active fibroblast-like keratocytes/myofibroblasts. While the NGF effect on epithelial cells has been investigated, no data are reported for NGF effects on fibroblastic-keratocytes, during corneal healing. NGF, trkA(NGFR) and p75(NTR) were found expressed by fibroblastic-keratocytes. NGF was able to induce fibroblastic-keratocyte differentiation into myofibroblasts, migration, Metalloproteinase-9 expression/activity and contraction of a 3D collagen gel, without affecting their proliferation and collagen production. These data also show a two-directional control of fibroblastic-keratocytes by NGF and TGF-beta1. To sum up, the findings of this study indicate that NGF can modulate some functional activities of fibroblastic-keratocytes, thus substantiating the healing effects of NGF on corneal wound-healing.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Differentiation / drug effects
  • Cell Movement / drug effects
  • Cell Proliferation / drug effects
  • Cells, Cultured
  • Cornea / cytology
  • Cornea / drug effects*
  • Cornea / physiology
  • Dose-Response Relationship, Drug
  • Fibroblasts / cytology
  • Fibroblasts / drug effects*
  • Fibroblasts / metabolism
  • Humans
  • Nerve Growth Factor / metabolism
  • Nerve Growth Factor / pharmacology*
  • Receptor, Nerve Growth Factor / metabolism
  • Receptor, trkA / metabolism
  • Reverse Transcriptase Polymerase Chain Reaction / methods
  • Wound Healing / drug effects*
  • Wound Healing / physiology

Substances

  • Receptor, Nerve Growth Factor
  • Nerve Growth Factor
  • Receptor, trkA