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2016 ; 7
(8
): 8866-78
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gab.com Text
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English Wikipedia
Activated hepatic stellate cells promote liver cancer by induction of
myeloid-derived suppressor cells through cyclooxygenase-2
#MMPMID26758420
Xu Y
; Zhao W
; Xu J
; Li J
; Hong Z
; Yin Z
; Wang X
Oncotarget
2016[Feb]; 7
(8
): 8866-78
PMID26758420
show ga
Hepatic stellate cells (HSCs) are critical mediators of immunosuppression and the
pathogenesis of hepatocellular carcinoma (HCC). Our previous work indicates that
HSCs promote HCC progression by enhancing immunosuppressive cell populations
including myeloid-derived suppressor cells (MDSCs) and regulatory T cells
(Tregs). MDSCs are induced by inflammatory cytokines (e.g., prostaglandins) and
are important in immune suppression. However, how HSCs mediate expansion of MDSCs
is uncertain. Thus, we studied activated HSCs that could induce MDSCs from bone
marrow cells and noted that HSC-induced MDSCs up-regulated immunosuppressive
activity via iNOS, Arg-1, and IL-4R?. After treating cells with a COX-2 inhibitor
or an EP4 antagonist, we established that HSC-induced MDSC accumulation was
mediated by the COX2-PGE2-EP4 signaling. Furthermore, in vivo animal studies
confirmed that inhibition of HSC-derived PGE2 could inhibit HSC-induced MDSC
accumulation and HCC growth. Thus, our data show that HSCs are required for MDSC
accumulation mediated by the COX2-PGE2-EP4 pathway, and these data are the first
to link HSC and MDSC subsets in HCC immune microenvironment and provide a
rationale for targeting PGE2 signaling for HCC therapy.