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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cell+Mol+Med
2017 ; 21
(9
): 2046-2054
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NKG2D ligand RAE1? induces generation and enhances the inhibitor function of
myeloid-derived suppressor cells in mice
#MMPMID28276625
Qian L
; Liu Y
; Wang S
; Gong W
; Jia X
; Liu L
; Ye F
; Ding J
; Xu Y
; Fu Y
; Tian F
J Cell Mol Med
2017[Sep]; 21
(9
): 2046-2054
PMID28276625
show ga
Expression of surface NKG2D ligands on tumour cells, which activates nature
killer (NK) cells and CD8(+) T cells, is crucial in antitumour immunity. Some
types of tumours have evolved mechanisms to suppress NKG2D-mediated immune cell
activation, such as tumour-derived soluble NKG2D ligands or sustained NKG2D
ligands produced by tumours down-regulate the expression of NKG2D on NK cells and
CD8(+) T cells. Here, we report that surface NKG2D ligand RAE1? on tumour cells
induces CD11b(+) Gr-1(+) myeloid-derived suppressor cell (MDSC) via NKG2D in
vitro and in vivo. MDSCs induced by RAE1? display a robust induction of IL-10 and
arginase, and these MDSCs show greater suppressive activity by inhibiting
antigen-non-specific CD8(+) T-cell proliferation. Consistently, upon adoptive
transfer, MDSCs induced by RAE1? significantly promote CT26 tumour growth in
IL-10- and arginase-dependent manners. RAE1? moves cytokine balance towards Th2
but not Th1 in vivo. Furthermore, RAE1? enhances inhibitory function of
CT26-derived MDSCs and promotes IL-4 rather than IFN-? production from
CT26-derived MDSCs through NKG2D in vitro. Our study has demonstrated a novel
mechanism for NKG2D ligand(+) tumour cells escaping from immunosurveillance by
facilitating the proliferation and the inhibitory function of MDSCs.