Mesenchymal stromal cells reprogram monocytes and macrophages with processing bodies.
T cell
cell interactions
cellular therapy
immunosuppression
mesenchymal stromal cells
myeloid cells
reprogramming
umbilical cord
Journal
Stem cells (Dayton, Ohio)
ISSN: 1549-4918
Titre abrégé: Stem Cells
Pays: England
ID NLM: 9304532
Informations de publication
Date de publication:
01 2021
01 2021
Historique:
received:
04
05
2020
accepted:
28
09
2020
pubmed:
10
11
2020
medline:
15
12
2021
entrez:
9
11
2020
Statut:
ppublish
Résumé
Mesenchymal stromal cells (MSCs) are widely used in clinical trials because of their ability to modulate inflammation. The success of MSCs has been variable over 25 years, most likely due to an incomplete understanding of their mechanism. After MSCs are injected, they traffic to the lungs and other tissues where they are rapidly cleared. Despite being cleared, MSCs suppress the inflammatory response in the long term. Using human cord tissue-derived MSCs (hCT-MSCs), we demonstrated that hCT-MSCs directly interact and reprogram monocytes and macrophages. After engaging hCT-MSCs, monocytes and macrophages engulfed cytoplasmic components of live hCT-MSCs, then downregulated gene programs for antigen presentation and costimulation, and functionally suppressed the activation of helper T cells. We determined that low-density lipoprotein receptor-related proteins on monocytes and macrophages mediated the engulfment of hCT-MSCs. Since a large amount of cellular information can be packaged in cytoplasmic RNA processing bodies (p-bodies), we generated p-body deficient hCT-MSCs and confirmed that they failed to reprogram monocytes and macrophages in vitro and in vivo. hCT-MSCs suppressed an inflammatory response caused by a nasal lipopolysaccharide challenge. Although both control and p-body deficient hCT-MSCs were engulfed by infiltrating lung monocytes and macrophages, p-body deficient hCT-MSCs failed to suppress inflammation and downregulate MHC-II. Overall, we identified a novel mechanism by which hCT-MSCs indirectly suppressed a T-cell response by directly interacting and reprogramming monocytes and macrophages via p-bodies. The results of this study suggest a novel mechanism for how MSCs can reprogram the inflammatory response and have long-term effects to suppress inflammation.
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
115-128Informations de copyright
© 2020 AlphaMed Press.
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