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2015 ; 7
(6
): 735-53
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gab.com Text
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Pharmacological targeting of the protein synthesis mTOR/4E-BP1 pathway in
cancer-associated fibroblasts abrogates pancreatic tumour chemoresistance
#MMPMID25834145
Duluc C
; Moatassim-Billah S
; Chalabi-Dchar M
; Perraud A
; Samain R
; Breibach F
; Gayral M
; Cordelier P
; Delisle MB
; Bousquet-Dubouch MP
; Tomasini R
; Schmid H
; Mathonnet M
; Pyronnet S
; Martineau Y
; Bousquet C
EMBO Mol Med
2015[Jun]; 7
(6
): 735-53
PMID25834145
show ga
Pancreatic ductal adenocarcinoma (PDAC) is extremely stroma-rich.
Cancer-associated fibroblasts (CAFs) secrete proteins that activate survival and
promote chemoresistance of cancer cells. Our results demonstrate that CAF
secretome-triggered chemoresistance is abolished upon inhibition of the protein
synthesis mTOR/4E-BP1 regulatory pathway which we found highly activated in
primary cultures of ?-SMA-positive CAFs, isolated from human PDAC resections.
CAFs selectively express the sst1 somatostatin receptor. The SOM230 analogue
(Pasireotide) activates the sst1 receptor and inhibits the mTOR/4E-BP1 pathway
and the resultant synthesis of secreted proteins including IL-6. Consequently,
tumour growth and chemoresistance in nude mice xenografted with pancreatic cancer
cells and CAFs, or with pieces of resected human PDACs, are reduced when
chemotherapy (gemcitabine) is combined with SOM230 treatment. While gemcitabine
alone has marginal effects, SOM230 is permissive to gemcitabine-induced cancer
cell apoptosis and acts as an antifibrotic agent. We propose that selective
inhibition of CAF protein synthesis with sst1-directed pharmacological compounds
represents an anti-stromal-targeted therapy with promising chemosensitization
potential.
|*Drug Resistance
[MESH]
|Adaptor Proteins, Signal Transducing/antagonists & inhibitors/*metabolism
[MESH]
|Adenocarcinoma/drug therapy
[MESH]
|Animals
[MESH]
|Antineoplastic Agents/*pharmacology
[MESH]
|Carcinoma, Pancreatic Ductal/drug therapy
[MESH]
|Cell Cycle Proteins
[MESH]
|Cells, Cultured
[MESH]
|Deoxycytidine/analogs & derivatives/therapeutic use
[MESH]