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Author Spotlight: Standardizing and Improving the Extraction and Purification of Extracellular Vesicles from Human ADSCs
Published on: May 3, 2024
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Mesenchymal Stromal Cell-Derived Extracellular Vesicles Attenuate Dendritic Cell Maturation and Function.
Monica Reis1, Emily Mavin1, Lindsay Nicholson1
1Haematological Sciences, Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom.
Frontiers in Immunology
|November 27, 2018
Summary
Mesenchymal stromal cell-derived extracellular vesicles (MSC-EVs) modulate dendritic cell (DC) function by inhibiting maturation and migration. Enclosed microRNAs, particularly miR-21-5p, are key mediators of this immunomodulatory effect, suggesting MSC-EVs as potential cell-free therapies.
Area of Science:
- Immunology
- Cell Biology
- Extracellular Vesicles
Background:
- Mesenchymal stromal cells (MSCs) regulate immune responses via paracrine signaling.
- MSC-secreted extracellular vesicles (MSC-EVs) are key mediators of MSC therapeutic functions.
- The immunomodulatory effects of MSC-EVs on dendritic cells (DCs) require comprehensive investigation.
Purpose of the Study:
- To investigate the impact of MSC-EVs on dendritic cell (DC) maturation and function.
- To identify the molecular mechanisms, specifically microRNAs, underlying MSC-EV mediated DC modulation.
- To explore the potential of MSC-EVs as cell-free therapeutic agents for immune dysregulation.
Main Methods:
- Isolation of MSC-EVs via differential ultracentrifugation.
- Generation of human monocyte-derived DCs in the presence of MSC-EVs.
- Phenotypic and functional analysis of DCs, including antigen uptake, maturation markers, cytokine secretion, and migration assays.
- MicroRNA profiling of MSC-EVs and in silico analysis of miRNA targets.
- Validation of miR-21-5p function via transfection of DCs with miR-21-5p mimics.
Main Results:
- MSC-EVs impaired DC antigen uptake and halted maturation, reducing expression of CD83, CD38, and CD80.
- MSC-EV treatment decreased pro-inflammatory cytokines (IL-6, IL-12p70) and increased anti-inflammatory cytokine (TGF-β) secretion.
- MSC-EVs reduced DC CCR7 expression and migration towards CCL21, with miR-21-5p identified as a key mediator targeting CCR7.
- MSC-EVs contained enriched microRNAs, including miR-21-5p, miR-142-3p, miR-223-3p, and miR-126-3p, involved in DC modulation.
Conclusions:
- MSC-EVs effectively recapitulate MSC-mediated DC modulation, inhibiting maturation and migration.
- Enclosed microRNAs within MSC-EVs, particularly miR-21-5p, represent a novel mechanism for MSCs to modulate DC function.
- MSC-EVs hold promise as cell-free therapeutic agents for immune-related diseases, offering an alternative to cell-based therapies.
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