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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Cancer+Discov
2016 ; 6
(4
): 400-413
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gab.com Text
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IFN? and CCL2 Cooperate to Redirect Tumor-Infiltrating Monocytes to Degrade
Fibrosis and Enhance Chemotherapy Efficacy in Pancreatic Carcinoma
#MMPMID26896096
Long KB
; Gladney WL
; Tooker GM
; Graham K
; Fraietta JA
; Beatty GL
Cancer Discov
2016[Apr]; 6
(4
): 400-413
PMID26896096
show ga
Dense fibrosis and a robust macrophage infiltrate are key therapeutic barriers in
pancreatic ductal adenocarcinoma (PDAC). CD40 activation can circumvent these
barriers by inducing macrophages, originating from peripheral blood monocytes, to
deplete fibrosis. The precise mechanism and therapeutic implications of this
antifibrotic activity, though, remain unclear. Here, we report that IFN? and CCL2
released systemically in response to a CD40 agonist cooperate to redirect a
subset of Ly6C(+)CCR2(+)monocytes/macrophages to infiltrate tumors and deplete
fibrosis. Whereas CCL2 is required for Ly6C(+)monocyte/macrophage infiltration,
IFN? is necessary for tumor-infiltrating monocytes/macrophages to shift the
profile of matrix metalloproteinases (MMP) in tumors, leading to MMP-dependent
fibrosis degradation. In addition, MMP13-dependent loss of extracellular matrix
components induced by a CD40 agonist increased PDAC sensitivity to chemotherapy.
Our findings demonstrate that fibrosis in PDAC is a bidirectional process that
can be rapidly altered by manipulating a subset of tumor-infiltrating monocytes,
leading to enhanced chemotherapy efficacy. SIGNIFICANCE: We report that CD40
agonists improve chemotherapy efficacy in pancreatic carcinoma by redirecting
tumor-infiltrating monocytes/macrophages to induce fibrosis degradation that is
dependent on MMPs. These findings provide novel insight into the plasticity of
monocytes/macrophages in cancer and their capacity to regulate fibrosis and
modulate chemotherapy efficacy in pancreatic carcinoma.