期刊
EMBO JOURNAL
卷 36, 期 20, 页码 3012-3028出版社
WILEY
DOI: 10.15252/embj.201696003
关键词
CD4(+) T cells; dendritic cells; exosomes; extracellular vesicles; microvesicles
资金
- French National Research Agency through the Investments for the Future programme [ANR-10-INSB-04]
- French National Research Agency through the IDEX programme
- French National Research Agency through the Labex programme [ANR-10-IDEX-0001-02 PSL*, ANR-11-LABX-0043]
- Fondation ARC [SL220120605293]
- ANRS [2015-1]
- NIDA (Johns Hopkins Medical University) [DA040385]
- CIC IGR-Curie [1428]
- INSERM
- Institut Curie
Exosomes, nano-sized secreted extracellular vesicles (EVs), are actively studied for their diagnostic and therapeutic potential. In particular, exosomes secreted by dendritic cells (DCs) have been shown to carry MHC-peptide complexes allowing efficient activation of T lymphocytes, thus displaying potential as promoters of adaptive immune responses. DCs also secrete other types of EVs of different size, subcellular origin and protein composition, whose immune capacities have not been yet compared to those of exosomes. Here, we show that large EVs (lEVs) released by human DCs are as efficient as small EVs (sEVs), including exosomes, to induce CD4(+) T-cell activation in vitro. When released by immature DCs, however, lEVs and sEVs differ in their capacity to orient T helper (Th) cell responses, the former favouring secretion of Th2 cytokines, whereas the latter promote Th1 cytokine secretion (IFN-gamma). Upon DC maturation, however, these functional differences are abolished, and all EVs become able to induce IFN-gamma. Our results highlight the need to comprehensively compare the functionalities of EV subtypes in all patho/physiological systems where exosomes are claimed to perform critical roles.
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