Rapid quantitative assays for corneal endothelial cell viability in vitro

Area of Science:

• Ophthalmology
• Toxicology
• Cell Biology

Background:

• Corneal endothelial cytotoxicity assessment is crucial for drug safety.
• Existing methods for evaluating cytotoxicity have limitations in speed and tissue availability.
• In vitro methods are essential for reducing animal testing in toxicology.

Purpose of the Study:

• To compare the efficacy of the Janus green photometric technique and Mosmann's colorimetric MTT assay for quantifying corneal endothelial cytotoxicity.
• To evaluate the suitability of these assays for screening chemical toxicity.
• To assess the potential of these methods to reduce animal usage in toxicological studies.

Main Methods:

• Comparison of Janus green photometric technique and MTT assay using human and bovine corneal endothelial cells.
• Detergents were used to induce cytotoxicity.
• Cytotoxicity levels were quantified at specific detergent concentrations (1% for Janus green, 0.4% for MTT).

Main Results:

• Detergents demonstrated toxicity at 1% in the Janus green assay (human corneas) and 0.4% in the MTT assay (bovine endothelial cells).
• Results from both assays correlated well with previous in vitro and in vivo findings.
• Human cornea availability and heterogeneity limited the Janus green assay's utility as a rapid screening tool.

Conclusions:

• The MTT assay is a suitable high-throughput method for screening chemical cytotoxicity using cultured cells.
• Both Janus green and MTT assays are valuable tools for assessing endothelial cytotoxicity.
• These in vitro assays can significantly reduce the number of animals required for corneal endothelial cytotoxicity testing.