Compressed Collagen Enhances Stem Cell Therapy for Corneal Scarring

Area of Science:

• Ophthalmology
• Regenerative Medicine
• Biomaterials Science

Background:

• Corneal stromal scarring impairs vision.
• Human corneal stromal stem cells (CSSC) show potential for corneal regeneration.
• Efficient delivery of CSSC is crucial for therapeutic efficacy.

Purpose of the Study:

• To evaluate compressed collagen gel (CCG) as a delivery vehicle for CSSC.
• To assess the efficacy of CCG-loaded CSSC in a mouse corneal wound-healing model.
• To determine the viability and cryopreservation potential of CSSC within CCG.

Main Methods:

• CSSC were embedded in soluble rat-tendon collagen, gelled, and dehydrated to form CCG disks.
• CCG disks were adhered to de-epithelialized mouse corneas using a fibrin-based adhesive.
• Cell viability, cryopreservation, scarring suppression, and fibrotic gene expression were assessed.

Main Results:

• CCG disks were stable, easy to handle, and adhered well to corneas.
• CSSC in CCG maintained high viability (>80%) for over a week and could be cryopreserved.
• As few as 500 CSSC in CCG effectively prevented scarring and suppressed fibrotic Col3a1 mRNA.
• CSSC in CCG were more effective per cell than CSSC in fibrin gel and retained efficacy after cryopreservation.

Conclusions:

• Compressed collagen gel is a viable and effective vehicle for delivering CSSC for corneal therapy.
• This biomaterial facilitates CSSC handling, storage, and cryopreservation, enabling potential off-the-shelf applications.
• CCG-mediated CSSC delivery offers a promising strategy to combat corneal scarring and promote tissue regeneration.