Effects of antiglaucoma drugs on cellular proliferation in cultured human corneal keratocytes

Area of Science:

• Ophthalmology
• Cell Biology
• Pharmacology

Background:

• Glaucoma is a leading cause of irreversible blindness.
• Antiglaucoma medications are crucial for managing intraocular pressure.
• Corneal health is vital for ocular function and drug delivery.

Purpose of the Study:

• To evaluate the impact of common antiglaucoma drugs on human corneal keratocyte proliferation.
• To determine if antiglaucoma drugs directly affect corneal cell growth or if preservatives are responsible.

Main Methods:

• Cultured human corneal keratocytes were exposed to various antiglaucoma drugs (timolol, betaxolol, carteolol, levobunolol, dipivefrin, pilocarpine) at different dilutions.
• Cellular proliferation was quantified using the [3H]thymidine uptake assay.
• The effect of benzalkonium chloride preservative alone was also assessed.

Main Results:

• A 1/10 dilution of all tested antiglaucoma drugs significantly inhibited keratocyte proliferation.
• Specific inhibition percentages ranged from 18% to 87% depending on the drug.
• Benzalkonium chloride preservative at 0.01 mg/mL also significantly suppressed cellular proliferation.

Conclusions:

• High concentrations of antiglaucoma drugs inhibit corneal keratocyte proliferation.
• The observed inhibition is likely attributable to the benzalkonium chloride preservative present in the formulations.
• This finding has implications for understanding potential side effects of topical ocular medications on corneal health.