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.
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.
