Abstract:
:The major reservoir of human multipotent mesenchymal stem/stromal cells (MSCs) is the bone marrow (BM) with the capability to control hematopoietic stem cell development. The regenerative potential of MSCs is associated with enhanced endogenous repair and healing mechanisms that modulate inflammatory responses. Our previous results revealed that MSC-like (MSCl) cells derived from pluripotent human embryonic stem cells resemble BM-derived MSCs in morphology, phenotype, and differentiating potential. In this study, we investigated the effects of MSCl cells on the phenotype and functions of dendritic cells (DCs). To assess how antiviral immune responses could be regulated by intracellular pattern recognition receptors of DCs in the presence of MSCl cells, we activated DCs with the specific ligands of retinoic acid-inducible gene-I (RIG-I) helicases and found that activated DCs cocultured with MSCl cells exhibited reduced expression of CD1a and CD83 cell surface molecules serving as phenotypic indicators of DC differentiation and activation, respectively. However, RIG-I-mediated stimulation of DCs through specific ligands in the presence of MSCl cells resulted in significantly higher expression of the costimulatory molecules, CD80 and CD86, than in the presence of BM-MSCs. In line with these results, the concentration of IL-6, IL-10, and CXCL8 was increased in the supernatant of the DC-MSCl cocultures, while the secretion of TNF-α, CXCL10, IL-12, and IFNγ was reduced. Furthermore, the concerted action of mechanisms involved in the regulation of DC migration resulted in the blockade of cell migration, indicating altered DC functionality mediated by MSCl cell-derived signals and mechanisms resulting in a suppressive microenvironment.
journal_name
Stem Cells Devjournal_title
Stem cells and developmentauthors
Bacskai I,Mázló A,Kis-Tóth K,Szabó A,Panyi G,Sarkadi B,Apáti Á,Rajnavölgyi Édoi
10.1089/scd.2014.0509subject
Has Abstractpub_date
2015-08-01 00:00:00pages
1805-16issue
15eissn
1547-3287issn
1557-8534journal_volume
24pub_type
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