Surface modification of collagen-based artificial cornea for reduced endothelialization.

Area of Science:

• Biomaterials Science
• Ophthalmology
• Tissue Engineering

Background:

• Corneal transplantation is a common procedure for vision restoration.
• Current corneal grafts face challenges with cell migration and integration.
• Developing advanced biomaterials is crucial for improving graft outcomes.

Purpose of the Study:

• To engineer collagen-based hydrogels as functional corneal tissue substitutes.
• To prevent posterior endothelial cell migration using surface modification.
• To evaluate the efficacy and biocompatibility of the modified hydrogels.

Main Methods:

• Collagen hydrogels were fabricated for full-thickness corneal grafts.
• Plasma-assisted surface modification involved ammonia functionalization and alginate grafting.
• Endothelial cell attachment, optical properties, and swelling characteristics were assessed.
• Fourier transform infrared spectroscopy confirmed alginate grafting.

Main Results:

• Plasma-alginate treatment significantly reduced endothelial cell attachment on the posterior surface.
• Reduced cell attachment correlated with alginate concentration and plasma radio frequency (RF) power.
• The treatment preserved desirable optical and swelling properties of the hydrogels.
• Alginate grafting enhanced posterior surface hydrophilicity.

Conclusions:

• Plasma-assisted alginate grafting is an effective method to prevent cell migration in corneal hydrogel grafts.
• The modified hydrogels exhibit superior optical and swelling properties compared to human cornea.
• These collagen-based hydrogels show promise as advanced corneal tissue substitutes.