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2018 ; 7
(5
): 41
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Tumor-derived exosomes induce PD1(+) macrophage population in human gastric
cancer that promotes disease progression
#MMPMID29799520
Wang F
; Li B
; Wei Y
; Zhao Y
; Wang L
; Zhang P
; Yang J
; He W
; Chen H
; Jiao Z
; Li Y
Oncogenesis
2018[May]; 7
(5
): 41
PMID29799520
show ga
Macrophages constitute a major component of tumor-infiltrating immune cells. M2
macrophages have been reported to promote tumor progression through promoting
tumor angiogenesis and metastasis and regulating T-cell function. Here, we
identified a protumorigenic subset of macrophages that constitutively expressed
programmed cell death 1 (PD1) and accumulated in advanced-stage gastric cancer
(GC). These PD1(+) tumor-associated macrophages (TAMs) exhibited an M2-like
surface profile, with a significant increase in the expression of CD206, IL-10,
and CCL1, and a clear decrease in the expression of MHC class II, CD64, and IL-12
and the ability to phagocytose ovalbumin. Moreover, PD1(+) TAMs can suppress
CD8(+) T-cell function and this immunosuppressive activity can effectively be
enhanced upon triggering PD1 signal. GC-derived exosomes effectively educated
monocytes to differentiate into PD1(+) TAMs with M2 phenotypic and functional
characteristics. Together, our results are the first to show that GC-derived
exosomes can effectively induce PD1(+) TAM generation, and these cells can
produce a large number of IL-10, impair CD8(+) T-cell function, and thereby
create conditions that promote GC progression. Thus, methods in which
immunotherapy is combined with targeting PD1(+) TAMs and tumor-derived exosomes
should be used to restore immune function in GC patients.