IL-15 negatively regulates curdlan-induced IL-23 production by human monocyte-derived dendritic cells and subsequent Th17 response.
Dendritic cell
IL-15
IL-23
Th17
Journal
Northern clinics of Istanbul
ISSN: 2536-4553
Titre abrégé: North Clin Istanb
Pays: Turkey
ID NLM: 101684520
Informations de publication
Date de publication:
2019
2019
Historique:
received:
05
07
2019
accepted:
19
08
2019
entrez:
8
1
2020
pubmed:
8
1
2020
medline:
8
1
2020
Statut:
epublish
Résumé
In this study, we aimed to assess the effects of long- and short-term IL-15 cytokine exposure of human monocyte-derived curdlan-matured dendritic cells (DCs) on the production of Th17 cell-polarizing cytokine IL-23 and subsequent Th17 cell activation. Peripheral blood mononuclear cells (PBMCs) were purified using Ficoll-Paque from healthy donors. Monocytes were magnetically selected using CD14 Miltenyi beads and differentiated into DCs with granulocyte-macrophage colony-stimulating factor (GM-CSF) and IL-4 for five days in the presence or absence of IL-15 (100ng/ml) for long-term exposure experiments. Then, DCs were matured with peptidoglycan (PGN), or curdlan for 24 hours. For short-term exposure experiments, IL-15 was added only during maturation of DCs. Then, DCs were characterized concerning the expression of MHC II and costimulatory molecules, production of cytokine subunits IL-23p19, IL-12p40, IL-12p35 and cytokine IL-23 via flow cytometry or real-time qPCR or ELISA. Finally, the phosphorylation of signaling molecules after curdlan stimulation was assessed using phospho-flow assays. IL-15 exposure suppressed IL-23 production by DCs. As a result, IL-15-exposed DCs suppressed IL-17 production by allogeneic T cells. Importantly, we observed a reduction in the surface Dectin-1 receptor levels by IL-15-exposed DCs. In line with these observations, curdlan stimulation resulted in reduced phosphorylation of ERK1/2, NF-kB p65 and AKT by human DCs exposed to IL-15 compared with controls. These results may explain why IL-15-exposed DCs produce less IL-23 after maturation with curdlan, which is a ligand of Dectin-1. Short- or long-term exposure to IL-15 of human DCs during their differentiation or maturation programs DCs against Th17 cell polarization, which suggests that IL-15 availability may affect CD4+ T cell-mediated protective immunity to fungal infections.
Identifiants
pubmed: 31909384
doi: 10.14744/nci.2019.38802
pii: NCI-6-379
pmc: PMC6936942
doi:
Types de publication
Journal Article
Langues
eng
Pagination
379-387Informations de copyright
Copyright: © 2019 by Istanbul Northern Anatolian Association of Public Hospitals.
Déclaration de conflit d'intérêts
Conflict of Interest: No conflict of interest was declared by the authors.
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