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2016 ; 7
(38
): 60896-60905
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Activation and selective IL-17 response of human V?9V?2 T lymphocytes by
TLR-activated plasmacytoid dendritic cells
#MMPMID27590513
Lo Presti E
; Caccamo N
; Orlando V
; Dieli F
; Meraviglia S
Oncotarget
2016[Sep]; 7
(38
): 60896-60905
PMID27590513
show ga
V?9V?2 T cells and plasmacytoid dendritic cells (pDCs) are two distinct cell
types of innate immunity that participate in early phases of immune response. We
investigated whether a close functional relationship exists between these two
cell populations using an in vitro co-culture in a human system.pDCs that had
been activated by IL-3 and the TLR9 ligand CpG induced substantial activation of
V?9V?2 T cells upon co-culture, which was cell-to-cell contact dependent, as
demonstrated in transwell experiments, but that did not involve any of the
costimulatory molecules potentially expressed by pDCs or V?9V2 T cells, such as
ICOS-L, OX40 and CD40L. Activated pDCs selectively induced IL-17, but not IFN-?,
responses of V?9V?2T cells, which was dominant over the antigen-induced response,
and this was associated with the expansion of memory (both central and effector
memory) subsets of V?9V?2 T cells.Overall, our results provide a further piece of
information on the complex relationship between these two populations of cells
with innate immunity features during inflammatory responses.