A novel rabbit model for studying RPE transplantation

Area of Science:

• Ophthalmology
• Regenerative Medicine
• Cell Biology

Background:

• The retinal pigment epithelium (RPE) is crucial for retinal health.
• Dysfunction or loss of RPE cells contributes to blinding diseases.
• RPE transplantation is a promising therapeutic strategy.

Purpose of the Study:

• To develop and validate a robust animal model for RPE transplantation.
• To enable detailed analysis of transplanted RPE cell behavior and function.
• To facilitate the optimization of RPE transplantation protocols for clinical application.

Main Methods:

• Newborn rabbit RPE cells were cultured, characterized, and labeled with CFDA-SE.
• Labeled RPE cells were transplanted into the subretinal space of rabbits using a novel injection technique.
• Transplant survival, integration, and function were assessed using fundus photography, cSLO, OCT, angiography, and histochemistry.

Main Results:

• CFDA-SE labeling did not compromise RPE cell morphology or marker expression.
• Transplanted RPE cells formed functional monolayers with normal transepithelial electrical resistance.
• Labeled RPE cells were detectable for at least 2 months, demonstrating long-term survival and integration.
• Angiography confirmed an intact blood-retinal barrier, and histology showed normal retinal morphology.

Conclusions:

• A reliable and effective model for RPE transplantation in rabbits was established.
• This model supports the evaluation of RPE culture and transplantation techniques.
• The findings suggest potential for translating these protocols to human therapies due to anatomical similarities.