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Does Mitomycin C Cause Toxicity in the Cornea After Photorefractive Keratectomy? A Comparative Wound-Healing Study in a Refractive Surgery Animal Model

Blanco-Mezquita, Tomas PhD*,†; Espandar, Ladan MD*; Torres, Rodrigo MD, PhD; Alvarez-Barcia, Angel MD, PhD†,‡; Cantalapiedra-Rodriguez, Roberto; Martinez-Garcia, Carmen MD, PhD§; Merayo-Lloves, Jesus MD, PhD

doi: 10.1097/ICO.0000000000000219
Basic Investigation

Purpose: In this study, we investigated the wound-healing process after photorefractive keratectomy with mitomycin C (MMC) in hen corneas. In addition, we evaluated the synergistic effect of ethanol and MMC.

Methods: Forty-eight adult hens were divided into 3 groups: A: ethanol-assisted debridement plus MMC; B: mechanical debridement plus MMC; and C: mechanical debridement (MMC-untreated control). Photorefractive keratectomy was performed, and the animals were followed up for up to 60 days. Epithelial healing was measured with fluorescein. Apoptosis was evaluated by terminal deoxynucleotidyl transferase dUTP nick end-labeling assay and proliferation was measured by BrdU incorporation. Both myofibroblast differentiation and collagen deposition were evaluated by immunofluorescence and histology.

Results: Epithelial wound closure was similar in all 3 groups (P > 0.05). Significant reduction in haze was observed in groups A and B compared with C (P < 0.01), but there was no difference between groups A and B (P > 0.05). Furthermore, there was no difference in the number of apoptotic cells between groups. Proliferation was delayed in both groups A and B compared with C (P < 0.01), but groups A and B did not differ significantly (P > 0.05). Myofibroblasts, cellular density, and collagen deposition were lower in both groups A and B compared with C (P < 0.01), but they were not significantly different from each other (P > 0.05).

Conclusions: Topical application of MMC in hen corneas reproduces the wound healing observed in humans by reducing haze, keratocyte proliferation, myofibroblast differentiation, and new collagen deposition. Synergistic cytotoxic effects of ethanol and MMC were not observed.

*Department of Ophthalmology, Duke Eye Center, Duke University School of Medicine, Durham, NC;

Department of Ophthalmology, “Instituto Universitario de Oftalmobiología Aplicada” (IOBA), University of Valladolid, Valladolid, Spain;

Animal Facilities, University of Valladolid, Valladolid, Spain;

§Department of Cell Biology and Pharmacology, University of Valladolid, Valladolid, Spain; and

Instituto Oftalmológico Fernández-Vega, Fundación de Investigación en Oftalmología, University of Oviedo, Oviedo, Spain.

Reprints: Tomas Blanco-Mezquita, PhD, Department of Ophthalmology, Duke Eye Center, Duke University, 2351 Erwin Road, Durham, 27710, NC (e-mail: tomas.blanco@duke.edu).

Supported by grants FIS-PI: PIO52841; RETICS RD07/0062: Patología visual del envejecimiento, calidad de vida y calidad visual; PROFIT CIT-300100-50: Desarrollo de nuevos implantes intracorneales para correción de ametropías y tratamiento de ectasias corneales.

The authors have no conflicts of interest to disclose.

Received March 25, 2014

Received in revised form June 23, 2014

Accepted June 24, 2000

© 2014 by Lippincott Williams & Wilkins.