Lectin binding to injured corneal endothelium mimics patterns observed during development

Area of Science:

• Ophthalmology
• Cell Biology
• Regenerative Medicine

Background:

• The corneal endothelium plays a vital role in maintaining corneal clarity.
• Understanding cell surface dynamics during corneal wound healing is crucial for developing effective treatments.
• Lectins are proteins that bind to specific carbohydrate structures on cell surfaces, serving as valuable probes for cellular changes.

Purpose of the Study:

• To investigate dynamic changes in corneal endothelium cell surface glycoconjugates during wound repair in adult rats.
• To compare these changes with lectin binding patterns during normal fetal corneal development.
• To identify specific lectin binding alterations that correlate with distinct phases of endothelial wound healing.

Main Methods:

• Utilized fluorescence microscopy to visualize lectin binding to corneal endothelium.
• Employed a panel of fluorochrome-conjugated lectins: Wheat Germ Agglutinin (WGA), Concanavalin A (Con A), Ricinus communis agglutinin I (RCA), Griffonia simplicifolia I (GS-I), Soybean Agglutinin (SBA), and Ulex europaeus agglutinin (UEA).
• Induced a standardized circular freeze injury to the adult rat cornea and analyzed lectin binding at various time points (24 h, 48 h, 72 h, 1 week) post-injury.

Main Results:

• Non-injured adult endothelium showed binding for WGA, Con A, and RCA, but not GS-I, SBA, or UEA.
• Post-injury, WGA and Con A binding decreased initially, then increased, especially at cell-cell contacts, as the monolayer reformed.
• SBA binding appeared near the wound early post-injury and decreased significantly by 72 hours, unlike other lectins that returned to baseline levels.
• Fetal endothelium proliferation resembled adult wound repair morphology.

Conclusions:

• Lectin binding patterns, particularly for WGA and Con A, reflect dynamic changes in corneal endothelium cell surface carbohydrates during wound repair.
• SBA binding serves as a potential marker for specific stages of corneal wound healing.
• The study provides insights into the molecular mechanisms underlying corneal endothelial regeneration.