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2018 ; 9
(7
): 763
Nephropedia Template TP
gab.com Text
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English Wikipedia
CD45(+)CD33(low)CD11b(dim) myeloid-derived suppressor cells suppress CD8(+) T
cell activity via the IL-6/IL-8-arginase I axis in human gastric cancer
#MMPMID29988030
Mao FY
; Zhao YL
; Lv YP
; Teng YS
; Kong H
; Liu YG
; Wu XL
; Hao CJ
; Chen W
; Duan MB
; Han B
; Ma Q
; Wang TT
; Peng LS
; Zhang JY
; Cheng P
; Su CY
; Fu XL
; Zou QM
; Guo G
; Guo XL
; Zhuang Y
Cell Death Dis
2018[Jul]; 9
(7
): 763
PMID29988030
show ga
Myeloid-derived suppressor cells (MDSCs) are a prominent component of the
pro-tumoral response. The phenotype of and mechanisms used by MDSCs is
heterogeneous and requires more precise characterization in gastric cancer (GC)
patients. Here, we have identified a novel subset of CD45(+)CD33(low)CD11b(dim)
MDSCs in the peripheral blood of GC patients compared to healthy individuals.
CD45(+)CD33(low)CD11b(dim) MDSCs morphologically resembled neutrophils and
expressed high levels of the neutrophil marker CD66b. Circulating
CD45(+)CD33(low)CD11b(dim) MDSCs effectively suppressed CD8(+) T cells activity
through the inhibition of CD8(+) T cell proliferation and interferon-? (IFN-?)
and granzyme B (GrB) production. The proportion of CD45(+)CD33(low)CD11b(dim)
MDSCs also negatively correlated with the proportion of IFN-?(+)CD8(+) T cell in
the peripheral blood of GC patients. GC patient serum-derived IL-6 and IL-8
activated and induced CD45(+)CD33(low)CD11b(dim) MDSCs to express arginase I via
the PI3K-AKT signaling pathway. This pathway contributed to CD8(+) T cell
suppression as it was partially rescued by the blockade of the IL-6/IL-8-arginase
I axis. Peripheral blood CD45(+)CD33(low)CD11b(dim) MDSCs, as well as IL-6, IL-8,
and arginase I serum levels, positively correlated with GC progression and
negatively correlated with overall patient survival. Altogether, our results
highlight that a subset of neutrophilic CD45(+)CD33(low)CD11b(dim) MDSCs is
functionally immunosuppressive and activated via the IL-6/IL-8-arginase I axis in
GC patients.