Biosynthetic Collagen-Analog Hydrogels Stimulate Endogenous Regrowth of Rabbit Corneas: A Pilot Study.

Area of Science:

• Ophthalmology
• Biomaterials Science
• Regenerative Medicine

Background:

• Corneal damage impacts companion animal vision.
• Current treatments like corneal allografts have limitations.
• Pro-regenerative implants are needed for improved corneal healing.

Purpose of the Study:

• Evaluate early corneal tissue and nerve regeneration.
• Compare liquid and solid biosynthetic collagen-analog hydrogels (CAH) to allografts.
• Assess the efficacy of CAH in a rabbit keratectomy model.

Main Methods:

• Pilot study on nine New Zealand rabbits.
• Keratectomy followed by grafting with allografts, liquid CAH, or solid CAH.
• Assessment over 16 weeks via clinical exams, esthesiometry, confocal microscopy, and OCT.
• Histopathological analysis at 3, 10, and 16 weeks.

Main Results:

• Both liquid and solid CAH enabled corneal re-epithelialization and stromal tissue regeneration.
• Faster corneal nerve regeneration observed with CAH compared to allografts (p < 0.005).
• Regenerated neocorneas achieved transparency comparable to allografts by 16 weeks.

Conclusions:

• Solid and liquid CAH implants supported complete corneal tissue and nerve regeneration.
• Biosynthetic alternatives show promise to replace current corneal transplantation standards.
• Further research may lead to high-performing, easily produced biosynthetic corneal implants.