PURPOSE: The mouse has become an important wound healing model with which to study corneal fibrosis, a frequent complication of refractive surgery. The aim of the current study was to quantify changes in stromal ultrastructure and light scatter that characterize fibrosis in mouse corneal debridement wounds. METHODS: Epithelial debridement wounds, with and without removal of basement membrane, were produced in C57BL/6 mice. Corneal opacity was measured using optical coherence tomography, and collagen diameter and matrix order were quantified by x-ray scattering. Electron microscopy was used to visualize proteoglycans. Quantitative PCR (Q-PCR) measured mRNA transcript levels for several quiescent and fibrotic markers. RESULTS: Epithelial debridement without basement membrane disruption produced a significant increase in matrix disorder at 8 weeks, but minimal corneal opacity. In contrast, basement membrane penetration led to increases in light scatter, matrix disorder, and collagen diameter, accompanied by the appearance of abnormally large proteoglycans in the subepithelial stroma. This group also demonstrated upregulation of several quiescent and fibrotic markers 2 to 4 weeks after wounding. CONCLUSIONS: Fibrotic corneal wound healing in mice involves extensive changes to collagen and proteoglycan ultrastructure, consistent with deposition of opaque scar tissue. Epithelial basement membrane penetration is a deciding factor determining the degree of ultrastructural changes and resulting opacity.
PURPOSE: The mouse has become an important wound healing model with which to study corneal fibrosis, a frequent complication of refractive surgery. The aim of the current study was to quantify changes in stromal ultrastructure and light scatter that characterize fibrosis in mouse corneal debridement wounds. METHODS: Epithelial debridement wounds, with and without removal of basement membrane, were produced in C57BL/6 mice. Corneal opacity was measured using optical coherence tomography, and collagen diameter and matrix order were quantified by x-ray scattering. Electron microscopy was used to visualize proteoglycans. Quantitative PCR (Q-PCR) measured mRNA transcript levels for several quiescent and fibrotic markers. RESULTS: Epithelial debridement without basement membrane disruption produced a significant increase in matrix disorder at 8 weeks, but minimal corneal opacity. In contrast, basement membrane penetration led to increases in light scatter, matrix disorder, and collagen diameter, accompanied by the appearance of abnormally large proteoglycans in the subepithelial stroma. This group also demonstrated upregulation of several quiescent and fibrotic markers 2 to 4 weeks after wounding. CONCLUSIONS:Fibrotic corneal wound healing in mice involves extensive changes to collagen and proteoglycan ultrastructure, consistent with deposition of opaque scar tissue. Epithelial basement membrane penetration is a deciding factor determining the degree of ultrastructural changes and resulting opacity.
Authors: Bridgette L Berryhill; Bradley Kane; Brian M Stramer; M Elizabeth Fini; John R Hassell Journal: Exp Eye Res Date: 2003-07 Impact factor: 3.467
Authors: Mary Ann Stepp; James D Zieske; Vickery Trinkaus-Randall; Briana M Kyne; Sonali Pal-Ghosh; Gauri Tadvalkar; Ahdeah Pajoohesh-Ganji Journal: Exp Eye Res Date: 2014-03-04 Impact factor: 3.467
Authors: Fatima N Syed-Picard; Yiqin Du; Andrew J Hertsenberg; Rachelle Palchesko; Martha L Funderburgh; Adam W Feinberg; James L Funderburgh Journal: J Tissue Eng Regen Med Date: 2017-05-31 Impact factor: 3.963
Authors: Daniel P Maruri; Miguel Miron-Mendoza; Pouriska B Kivanany; Joshua M Hack; David W Schmidtke; W Matthew Petroll; Victor D Varner Journal: Biophys J Date: 2020-09-23 Impact factor: 4.033