Improvement of Storage Medium for Cultured Human Retinal Pigment Epithelial Cells Using Factorial Design

Area of Science:

• Ophthalmology
• Cell Biology
• Biomaterials Science

Background:

• Human retinal pigment epithelium (hRPE) cell storage is vital for developing cell-based replacement therapies.
• Maintaining hRPE cell viability, morphology, and phenotype during storage is a significant challenge.

Purpose of the Study:

• To identify storage medium additives that enhance hRPE cell viability and preserve cellular characteristics.
• To optimize storage conditions for hRPE cells using a combination of additives.

Main Methods:

• hRPE cells were cultured with sericin and stored with 46 different additives.
• Epifluorescence microscopy assessed individual additive effects on cell viability.
• Factorial design identified optimal additive combinations.
• Flow cytometry, proteomics, and transmission electron microscopy validated findings.

Main Results:

• A combination of sericin, adenosine, L-ascorbic acid, and allopurinol yielded the highest cell viability (98.6 ± 0.5%) after three days of storage.
• Proteomics revealed significant alterations in protein expression in the optimized storage group.
• Transmission electron microscopy confirmed the presence of melanosomes, indicating preserved RPE phenotype.

Conclusions:

• The optimized storage medium effectively preserves RPE pigmentation and cell viability.
• This combination of additives represents a promising strategy for improving hRPE cell banking for therapeutic applications.