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2016 ; 76
(6
): 1367-80
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gab.com Text
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English Wikipedia
Neutrophil Extracellular Traps Promote the Development and Progression of Liver
Metastases after Surgical Stress
#MMPMID26759232
Tohme S
; Yazdani HO
; Al-Khafaji AB
; Chidi AP
; Loughran P
; Mowen K
; Wang Y
; Simmons RL
; Huang H
; Tsung A
Cancer Res
2016[Mar]; 76
(6
): 1367-80
PMID26759232
show ga
Risks of tumor recurrence after surgical resection have been known for decades,
but the mechanisms underlying treatment failures remain poorly understood.
Neutrophils, first-line responders after surgical stress, may play an important
role in linking inflammation to cancer progression. In response to stress,
neutrophils can expel their protein-studded chromatin to form local snares known
as neutrophil extracellular traps (NET). In this study, we asked whether, as a
result of its ability to ensnare moving cells, NET formation might promote
metastasis after surgical stress. Consistent with this hypothesis, in a cohort of
patients undergoing attempted curative liver resection for metastatic colorectal
cancer, we observed that increased postoperative NET formation was associated
with a >4-fold reduction in disease-free survival. In like manner, in a murine
model of surgical stress employing liver ischemia-reperfusion, we observed an
increase in NET formation that correlated with an accelerated development and
progression of metastatic disease. These effects were abrogated by inhibiting NET
formation in mice through either local treatment with DNAse or inhibition of the
enzyme peptidylarginine deaminase, which is essential for NET formation. In
growing metastatic tumors, we found that intratumoral hypoxia accentuated NET
formation. Mechanistic investigations in vitro indicated that mouse
neutrophil-derived NET triggered HMGB1 release and activated TLR9-dependent
pathways in cancer cells to promote their adhesion, proliferation, migration, and
invasion. Taken together, our findings implicate NET in the development of liver
metastases after surgical stress, suggesting that their elimination may reduce
risks of tumor relapse.