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Updated: Aug 12, 2026
Ex Vivo Corneal Organ Culture Model for Wound Healing Studies
Published on: February 15, 2019
Timolol inhibits corneal epithelial wound healing in rabbits and monkeys
Abstract:
To determine the effect of timolol maleate on corneal epithelial wound closure, 6.4-mm (diameter) epithelial defects were created chemically in five experiments. In rabbits, wound closure was not significantly altered by the administration of 0.5% Timoptic (a commercially prepared timolol maleate solution) every eight hours, but it was inhibited during the first 15 hours of healing when a 4% solution was applied every two hours. Monkeys received a 5% solution every 12 hours and were divided into treated and control groups. Two phases of wound healing were apparent: a rapid initial phase and a slower final phase. Wound closure was inhibited in treated eyes during the initial rapid phase. This experiment repeated on the same monkeys, but with the control and treated animals switched, yielded the same result. Another experiment, with the fellow eye of the monkey used as a control, showed no significant difference in wound closure.
Insights
Timolol maleate
Area of Science:
- Ophthalmology
- Corneal Science
Background:
- Corneal epithelial defects require effective wound closure for visual recovery.
- Timolol maleate is a beta-blocker commonly used for glaucoma treatment.
Purpose of the Study:
- To investigate the impact of timolol maleate on corneal epithelial wound healing.
- To assess dose- and frequency-dependent effects on healing rates.
Main Methods:
- Creation of standardized 6.4-mm corneal epithelial defects in rabbits and monkeys.
- Topical administration of varying concentrations and frequencies of timolol maleate solutions.
- Comparison of wound closure times between treated and control eyes.
Main Results:
- Low-dose timolol maleate (0.5%) did not significantly affect rabbit corneal wound healing.
- High-dose timolol maleate (4%) inhibited healing in rabbits during the initial 15 hours.
- In monkeys, 5% timolol maleate inhibited early-phase corneal wound healing.
Conclusions:
- Timolol maleate can inhibit corneal epithelial wound closure, particularly at higher concentrations and frequencies.
- The effect appears to be dose-dependent and more pronounced during the initial phase of healing.
- Further research may be needed to optimize its use in ocular conditions involving wound healing.
