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2015 ; 6
(35
): 37526-43
Nephropedia Template TP
gab.com Text
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Combinatorial TGF-? attenuation with paclitaxel inhibits the
epithelial-to-mesenchymal transition and breast cancer stem-like cells
#MMPMID26462028
Park SY
; Kim MJ
; Park SA
; Kim JS
; Min KN
; Kim DK
; Lim W
; Nam JS
; Sheen YY
Oncotarget
2015[Nov]; 6
(35
): 37526-43
PMID26462028
show ga
Distant relapse after chemotherapy is an important clinical issue for treating
breast cancer patients and results from the development of cancer stem-like cells
(CSCs) during chemotherapy. Here we report that blocking
epithelial-to-mesenchymal transition (EMT) suppresses paclitaxel-induced CSCs
properties by using a MDA-MB-231-xenografted mice model (in vivo), and breast
cancer cell lines (in vitro). Paclitaxel, one of the cytotoxic taxane-drugs such
as docetaxel, increases mesenchymal markers (Vimentin and Fibronectin) and
decreases an epithelial marker (Zo-1). Blocking TGF-? signaling with the TGF-?
type I receptor kinase (ALK5) inhibitor, EW-7197, suppresses paclitaxel-induced
EMT and CSC properties such as mammosphere-forming efficiency (MSFE), aldehyde
dehydrogenase (ALDH) activity, CD44+/CD24- ratio, and pluripotency regulators
(Oct4, Nanog, Klf4, Myc, and Sox2). The combinatorial treatment of EW-7197
improves the therapeutic effect of paclitaxel by decreasing the lung metastasis
and increasing the survival time in vivo. We confirmed that Snail is increased by
paclitaxel-induced intracellular reactive oxygen species (ROS) and EW-7197
suppresses the paclitaxel-induced Snail and EMT by attenuating paclitaxel-induced
intracellular ROS. Knock-down of SNAI1 suppresses paclitaxel-induced EMT and CSC
properties. These data together suggest that blocking the Snail-induced EMT with
the ALK5 inhibitor attenuates metastasis after paclitaxel-therapy and that this
combinatorial approach could prove useful in treating breast cancer.