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2018 ; 9
(6
): 648
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HMGB1 released by irradiated tumor cells promotes living tumor cell proliferation
via paracrine effect
#MMPMID29844348
He S
; Cheng J
; Sun L
; Wang Y
; Wang C
; Liu X
; Zhang Z
; Zhao M
; Luo Y
; Tian L
; Li C
; Huang Q
Cell Death Dis
2018[May]; 9
(6
): 648
PMID29844348
show ga
Tumor repopulation during therapy is an important cause of treatment failure.
Strategies to overcome repopulation are arising in parallel with advances in the
comprehension of underlying biological mechanisms. Here, we reveal a new
mechanism by which high mobility group box 1 (HMGB1) released by dying cells
during radiotherapy or chemotherapy could stimulate living tumor cell
proliferationInhibition or genetic ablation of HMGB1 suppressed tumor cell
proliferation. This effect was due to binding of HMGB1with the member receptor
for advanced glycation end-products (RAGE), which activated downstream ERK and
p38 signaling pathway and promoted cell proliferation. Furthermore, higher HMGB1
expression in tumor tissue correlated with poor overall survival and higher HMGB1
concentration was detected in serum of patients who accepted radiotherapy.
Collectively, the results from this study suggested that interaction between dead
cells and surviving cells might influence the fate of tumor. HMGB1 could be a
novel tumor promoter with therapeutic and prognostic relevance in cancers.