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2016 ; 4
(ä): 83
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Stem Cell-Derived Extracellular Vesicles and Immune-Modulation
#MMPMID27597941
Burrello J
; Monticone S
; Gai C
; Gomez Y
; Kholia S
; Camussi G
Front Cell Dev Biol
2016[]; 4
(ä): 83
PMID27597941
show ga
Extra-cellular vesicles (EVs) are bilayer membrane structures enriched with
proteins, nucleic acids, and other active molecules and have been implicated in
many physiological and pathological processes over the past decade. Recently,
evidence suggests EVs to play a more dichotomic role in the regulation of the
immune system, whereby an immune response may be enhanced or supressed by EVs
depending on their cell of origin and its functional state. EVs derived from
antigen (Ag)-presenting cells for instance, have been involved in both innate and
acquired (or adaptive) immune responses, as Ag carriers or presenters, or as
vehicles for delivering active signaling molecules. On the other hand, tumor and
stem cell derived EVs have been identified to exert an inhibitory effect on
immune responses by carrying immuno-modulatory effectors, such as transcriptional
factors, non-coding RNA (Species), and cytokines. In addition, stem cell-derived
EVs have also been reported to impair dendritic cell maturation and to regulate
the activation, differentiation, and proliferation of B cells. They have been
shown to control natural killer cell activity and to suppress the innate immune
response (IIR). Studies reporting the role of EVs on T lymphocyte modulation are
controversial. Discrepancy in literature may be due to stem cell culture
conditions, methods of EV purification, EV molecular content, and functional
state of both parental and target cells. However, mesenchymal stem cell-derived
EVs were shown to play a more suppressive role by shifting T cells from an
activated to a T regulatory phenotype. In this review, we will discuss how stem
cell-derived EVs may contribute toward the modulation of the immune response.
Collectively, stem cell-derived EVs mainly exhibit an inhibitory effect on the
immune system.