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2018 ; 9
(ä): 388
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S100A4 Protects Myeloid-Derived Suppressor Cells from Intrinsic Apoptosis via
TLR4-ERK1/2 Signaling
#MMPMID29556233
Li Q
; Dai C
; Xue R
; Wang P
; Chen L
; Han Y
; Erben U
; Qin Z
Front Immunol
2018[]; 9
(ä): 388
PMID29556233
show ga
Myeloid-derived suppressor cells (MDSCs) often expand during cancer or chronic
inflammation and dampen immune responses. However, mechanisms underlying their
capacity to escape intrinsic apoptosis in the inflammatory environment are still
largely unknown. In this study, we investigated this in mouse tumor models with
MDSC accumulation. Spontaneous rejection of tumors implanted into mice deficient
for the small Ca(2+)-binding protein S100A4 (S100A4(-/-)) was accompanied by low
numbers of peripheral MDSCs. This was independent of S100A4 expression on tumor
cells. In contrast, MDSCs from S100A4(-/-) tumor-bearing mice showed a diminished
resistance to the induction of intrinsic apoptosis. Further studies demonstrated
that S100A4 protects MDSCs from apoptosis through toll-like
receptor-4/extracellular signal-regulated kinase-dependent caspase-9 inhibition.
The finding that S100A4 is critical for MDSC survival in inflammatory
environments might have important implications for the clinical treatment of
cancer or inflammation-related diseases.