The Effect of Therapeutic Human Serum Drops on Corneal Stromal Wound-Healing Activity

Abstract

Purpose: To investigate the effect of human serum, an ocular therapy, on human corneal fibroblast (HCF) wound-healing activities. Methods: The water soluble tetrazolium reagent-1, chemotactic chambers, fibroblast-populated type-I collagen gels, zymography, and Western blotting were used to assess HCF proliferation, migration, contraction, and matrix metalloproteinase (MMP) activity and levels, respectively. Fibroblasts were obtained from human donor corneas. Human serum, fibroblast culture medium (FCM; Dulbeccos Minimal Essential Medium/10% newborn calf serum) with and without calf serum supplementation, and 0.3% hypromellose were compared. Results: Proliferation and migration were maximal in 1% human serum. Relaxed gel contraction was maximal for fibroblasts cultured in 10%, 50%, and 100% serum and FCM. Whereas in stressed gels, maximal contraction was induced when fibroblasts were cultured in 50% and 100% serum. In low serum concentrations, greater MMP-2 activity was detected than MMP-1 and MMP-9. Conclusions: Low concentrations of human serum stimulated HCF migration, proliferation, and MMP activity. High concentrations produced greater matrix contraction. This may have implications for the therapeutic use of autologous serum.

KEYWORDS:

• cornea
• fibroblast
• serum
• therapeutic
• wound healing