Related Experiment Video
Updated: Jul 5, 2025
Efficient Dissection and Culture of Primary Mouse Retinal Pigment Epithelial Cells
Published on: February 10, 2021
Scaling up polarized RPE cell supernatant production on parylene membrane
Dimitrios Pollalis1, Alejandra Gonzalez Calle1, Juan Carlos Martinez-Camarillo1
1USC Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA; USC Ginsburg Institute for Biomedical Therapeutics, University of Southern California, Los Angeles, CA 90033, USA.
Abstract:
Age-related macular degeneration (AMD), a leading cause of vision loss, primarily arises from the degeneration of retinal pigment epithelium (RPE) and photoreceptors. Current therapeutic options for dry AMD are limited. Encouragingly, cultured RPE cells on parylene-based biomimetic Bruch's membrane demonstrate characteristics akin to the native RPE layer. In this study, we cultivated human embryonic stem cell-derived polarized RPE (hESC-PRPE) cells on parylene membranes at both small- and large-scale settings, collecting conditioned supernatant, denoted as PRPE-SF. We conducted a comprehensive analysis of the morphology of the cultured hESC-RPE cells and the secreted growth factors in PRPE-SF. To evaluate the in vivo efficacy of these products, the product was administered via intravitreal injections of PRPE-SF in immunodeficient Royal College of Surgeons (iRCS) rats, a model for retinal degeneration. Our study not only demonstrated the scalability of PRPE-SF production while maintaining RPE cell phenotype but also showed consistent protein concentrations between small- and large-scale batches. We consistently identified 10 key factors in PRPE-SF, including BMP-7, IGFBP-2, IGFBP-3, IGFBP-4, IGFBP-6, MANF, PEDF, PDGF-AA, TGFβ1, and VEGF. Following intravitreal administration of PRPE-SF, we observed a significant increase in the thickness of the outer nuclear layer (ONL) and photoreceptor preservation in iRCS rats. Furthermore, correlation analysis revealed that IGFBP-3, IGFBP-4, MANF, PEDF, and TGFβ1 displayed positive associations with in vivo bioactivity, while GDF-15 exhibited a negative correlation. Overall, this study highlights the feasibility of scaling up PRPE-SF production on parylene membranes without compromising its essential constituents. The outcomes of PRPE-SF administration in an animal model of retinal degeneration present substantial potential for photoreceptor preservation. Moreover, the identification of candidate surrogate potency markers, showing strong positive associations with in vivo bioactivity, lays a solid foundation for the development of a promising therapeutic intervention for retinal degenerative diseases.
Insights
This study developed a scalable method for producing a therapeutic factor (PRPE-SF) from retinal cells. Administering PRPE-SF to rats with retinal degeneration preserved photoreceptors, offering hope for treating vision loss.
Area of Science:
- Biomedical Engineering
- Ophthalmology
- Stem Cell Biology
Background:
- Age-related macular degeneration (AMD) causes significant vision loss due to retinal pigment epithelium (RPE) and photoreceptor degeneration.
- Current treatments for dry AMD are limited, necessitating novel therapeutic approaches.
- Biomimetic membranes offer a promising platform for culturing RPE cells.
Purpose of the Study:
- To assess the scalability of producing conditioned supernatant (PRPE-SF) from human embryonic stem cell-derived polarized RPE (hESC-PRPE) cells cultured on parylene membranes.
- To analyze the key growth factors within PRPE-SF.
- To evaluate the in vivo efficacy of PRPE-SF in preserving photoreceptors in a rat model of retinal degeneration.
Main Methods:
- Cultured hESC-PRPE cells on parylene membranes at small and large scales.
- Collected and analyzed conditioned supernatant (PRPE-SF) for morphology and secreted growth factors.
- Administered PRPE-SF via intravitreal injections into immunodeficient Royal College of Surgeons (iRCS) rats.
- Assessed the impact of PRPE-SF on retinal structure, specifically outer nuclear layer thickness and photoreceptor preservation.
Main Results:
- Demonstrated scalable production of PRPE-SF with consistent RPE cell phenotype and protein concentrations.
- Identified 10 key factors in PRPE-SF, including BMP-7, IGFBP-3, MANF, PEDF, and TGFβ1.
- Observed significant photoreceptor preservation and increased outer nuclear layer thickness in iRCS rats treated with PRPE-SF.
- Identified IGFBP-3, IGFBP-4, MANF, PEDF, and TGFβ1 as potential surrogate markers for in vivo bioactivity.
Conclusions:
- Scalable production of PRPE-SF on parylene membranes is feasible without compromising essential therapeutic components.
- PRPE-SF demonstrates significant potential for photoreceptor preservation in models of retinal degeneration.
- The identified surrogate potency markers provide a foundation for developing PRPE-SF as a therapeutic for retinal degenerative diseases.
