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Exosomal MiRNA Transfer between Retinal Microglia and RPE
Dorothea R Morris1, Sarah E Bounds2, Huanhuan Liu2
1Department of Ophthalmology & Visual Sciences, University of Texas Medical Branch, Galveston, TX 77555, USA.
International Journal of Molecular Sciences
|May 21, 2020
Summary
Retinal pigment epithelium (RPE) releases extracellular vesicles (EVs) containing age-dependent microRNAs (miRNAs). This transfer to microglia influences aging retina gene expression, suggesting a novel signaling pathway.
Area of Science:
- Ophthalmology
- Molecular Biology
- Cell Biology
Background:
- The retinal pigment epithelium (RPE) supports retinal health and modulates immune cells like microglia.
- Microglia migrate to the subretinal space during aging and degeneration.
- MicroRNAs (miRNAs) are crucial in tissue maintenance and inflammation.
Purpose of the Study:
- To analyze miRNA profiles in RPE-derived extracellular vesicles (EVs).
- To identify age-dependent miRNA changes in RPE EVs.
- To investigate the role of miRNA transfer in RPE-microglia communication during aging.
Main Methods:
- Analysis of miRNA profiles in extracellular vesicles (EVs) from RPE.
- Identification and validation of age-dependent miRNAs in EVs.
- Co-culture experiments with RPE and retinal microglia to study miRNA transfer.
- Assessment of miR-21 transfer and its downstream effects on the p53 pathway in microglia.
Main Results:
- Age-dependent changes in miRNA expression were identified in RPE-derived EVs.
- miR-21 was found to be transferred from RPE to microglia.
- Increased miR-21 in microglia affected the expression of p53 pathway target genes.
Conclusions:
- Exosome-mediated miRNA transfer is a key mechanism for RPE-microglia communication.
- This signaling pathway regulates microglia function in the aging retina.
- Findings provide insights into age-related retinal degeneration and potential therapeutic targets.
