Retinal transplantation using surface modified poly(glycerol-co-sebacic acid) membranes

Area of Science:

• Ophthalmology
• Biomaterials Science
• Regenerative Medicine

Background:

• Host photoreceptor cells and inner retinal cells can impede neuronal connections crucial for vision after retinal transplantation.
• Developing effective strategies for retinal transplantation requires overcoming physical barriers to graft-host integration.

Purpose of the Study:

• To evaluate the efficacy of a novel biomaterial composite for subretinal transplantation in porcine eyes.
• To assess the integration, survival, and potential for neuronal contact of transplanted retinal tissues using biodegradable membranes.

Main Methods:

• Developed biodegradable poly(glycerol-co-sebacic acid) (PGS) membranes for selective host photoreceptor removal.
• Coated PGS membranes with laminin and poly(epsilon-caprolactone) (PCL) nanofibers to enhance retinal explant attachment.
• Performed subretinal transplantation of composite grafts into adult porcine eyes and analyzed outcomes after 3 months.

Main Results:

• Composite grafts showed excellent fusion with retinal explants in vitro and were successfully transplanted in vivo.
• Histological analysis revealed biomaterial degradation without inflammation, with grafts located subretinally and displaying retinal lamination and photoreceptor development.
• Degeneration of host outer nuclear layer and occasional fusion of graft and host inner layers were observed, indicating successful integration.

Conclusions:

• Biodegradable PGS membranes coated with nanofibers provide a viable platform for retinal transplantation, promoting graft survival and integration.
• This approach facilitates the development of graft-host neuronal contacts by addressing physical obstructions in the host retina.
• The findings support the potential of this composite graft strategy for vision restoration in retinal degenerative diseases.