Apoptosis in the corneal epithelium

Area of Science:

• Ophthalmology
• Cell Biology
• Tissue Engineering

Background:

• The corneal epithelium is a dynamic tissue crucial for maintaining ocular surface health.
• Understanding cell turnover mechanisms is vital for regenerative medicine and disease treatment.

Purpose of the Study:

• To assess the viability of corneal surface cells in rabbits.
• To investigate the presence and mechanisms of apoptosis in the corneal epithelium.

Main Methods:

• Calcein-ethidium assay for cell viability assessment.
• TUNEL technique to detect DNA fragmentation indicative of apoptosis.
• Examination of both surface and shed corneal epithelial cells.

Main Results:

• Normal corneal epithelium predominantly comprises viable cells.
• Increased nonviable cells observed towards the center of the corneal surface.
• Apoptotic cells identified exclusively on the epithelial surface; shear stress increased apoptosis.

Conclusions:

• The corneal surface mainly contains viable cells, with a small proportion of nonviable and apoptotic cells.
• Cell removal occurs via shedding of terminally differentiated cells and apoptosis of viable cells.
• Multiple mechanisms contribute to corneal epithelial cell turnover.