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Umbilical cord mesenchymal stromal cell-derived extracellular vesicles lack the potency to immunomodulate human monocyte-derived macrophages in vitro

Mesenchymal stromal cells (MSCs) have been reported to display efficacy in a variety of preclinical models, but without long-term engraftment, suggesting a role for secreted factors, such as MSC-derived extracellular vesicles (EVs). MSCs are known to elicit immunomodulatory effects, an important asp...

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Main Authors: Borges da Silva, Tamiris (Author) , Rendra, Erika (Author) , David, Christopher A. W. (Author) , Bieback, Karen (Author) , Cross, Michael J. (Author) , Wilm, Bettina (Author) , Liptrott, Neill J. (Author) , Murray, Patricia (Author)
Format: Article (Journal)
Language:English
Published: November 2023
In: Biomedicine & pharmacotherapy
Year: 2023, Volume: 167, Pages: 1-11
ISSN:1950-6007
DOI:10.1016/j.biopha.2023.115624
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1016/j.biopha.2023.115624
Verlag, kostenfrei, Volltext: https://www.sciencedirect.com/science/article/pii/S0753332223014221
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Author Notes:Tamiris Borges da Silva, Erika Rendra, Christopher A.W. David, Karen Bieback, Michael J. Cross, Bettina Wilm, Neill J. Liptrott, Patricia Murray

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520 |a Mesenchymal stromal cells (MSCs) have been reported to display efficacy in a variety of preclinical models, but without long-term engraftment, suggesting a role for secreted factors, such as MSC-derived extracellular vesicles (EVs). MSCs are known to elicit immunomodulatory effects, an important aspect of which is their ability to affect macrophage phenotype. However, it is not clear if these effects are mediated by MSC-derived EVs, or other factors secreted by the MSCs. Here, we use flow cytometry to assess the effects of human umbilical cord (hUC) MSC-derived EVs on the expression of pro-inflammatory (CD80) and anti-inflammatory (CD163) surface markers in human monocyte-derived macrophages (hMDMs). hUC-MSC-derived EVs did not change the surface marker expression of the hMDMs. In contrast, when hMDMs were co-incubated with hUC-MSCs in indirect co-cultures, changes were observed in the expression of CD14, CD80 and CD163, particularly in M1 macrophages, suggesting that soluble factors are necessary to elicit a shift in phenotype. However, even though EVs did not alter the surface marker expression of macrophages, they promoted angiogenesis and phagocytic capacity increased proportionally to increases in EV concentration. Taken together, these results suggest that hUC-MSC-derived EVs are not sufficient to alter macrophage phenotype and that additional MSC-derived factors are needed. 
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