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2016 ; 6
(ä): 50-58
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Targeting myeloid-derived suppressor cells with colony stimulating factor-1
receptor blockade can reverse immune resistance to immunotherapy in indoleamine
2,3-dioxygenase-expressing tumors
#MMPMID27211548
Holmgaard RB
; Zamarin D
; Lesokhin A
; Merghoub T
; Wolchok JD
EBioMedicine
2016[Apr]; 6
(ä): 50-58
PMID27211548
show ga
Tumor indoleamine 2,3-dioxygenase (IDO) promotes immunosuppression by direct
action on effector T cells and Tregs and through recruitment, expansion and
activation of myeloid-derived suppressor cells (MDSCs). Targeting of MDSCs is
clinically being explored as a therapeutic strategy, though optimal targeting
strategies and biomarkers predictive of response are presently unknown.
Maturation and tumor recruitment of MDSCs are dependent on signaling through the
receptor tyrosine kinase CSF-1R on myeloid cells. Here, we show that MDSCs are
the critical cell population in IDO-expressing B16 tumors in mediating
accelerated tumor outgrowth and resistance to immunotherapy. Using a clinically
relevant drug, we show that inhibition of CSF-1R signaling can functionally block
tumor-infiltrating MDSCs and enhance anti-tumor T cell responses. Furthermore,
inhibition of CSF-1R sensitizes IDO-expressing tumors to immunotherapy with T
cell checkpoint blockade, and combination of CSF-1R blockade with IDO inhibitors
potently elicits tumor regression. These findings provide evidence for a critical
and functional role for MDSCs on the in vivo outcome of IDO-expressing tumors.