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2014 ; 41
(3
): 389-401
Nephropedia Template TP
gab.com Text
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English Wikipedia
The stress-response sensor chop regulates the function and accumulation of
myeloid-derived suppressor cells in tumors
#MMPMID25238096
Thevenot PT
; Sierra RA
; Raber PL
; Al-Khami AA
; Trillo-Tinoco J
; Zarreii P
; Ochoa AC
; Cui Y
; Del Valle L
; Rodriguez PC
Immunity
2014[Sep]; 41
(3
): 389-401
PMID25238096
show ga
Adaptation of malignant cells to the hostile milieu present in tumors is an
important determinant of their survival and growth. However, the interaction
between tumor-linked stress and antitumor immunity remains poorly characterized.
Here, we show the critical role of the cellular stress sensor C/EBP-homologous
protein (Chop) in the accumulation and immune inhibitory activity of
tumor-infiltrating myeloid-derived suppressor cells (MDSCs). MDSCs lacking Chop
had decreased immune-regulatory functions and showed the ability to prime T cell
function and induce antitumor responses. Chop expression in MDSCs was induced by
tumor-linked reactive oxygen and nitrogen species and regulated by the
activating-transcription factor-4. Chop-deficient MDSCs displayed reduced
signaling through CCAAT/enhancer-binding protein-?, leading to a decreased
production of interleukin-6 (IL-6) and low expression of phospho-STAT3. IL-6
overexpression restored immune-suppressive activity of Chop-deficient MDSCs.
These findings suggest the role of Chop in tumor-induced tolerance and the
therapeutic potential of targeting Chop in MDSCs for cancer immunotherapy.