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2016 ; 7
(44
): 71400-71416
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STC2 promotes the epithelial-mesenchymal transition of colorectal cancer cells
through AKT-ERK signaling pathways
#MMPMID27662663
Chen B
; Zeng X
; He Y
; Wang X
; Liang Z
; Liu J
; Zhang P
; Zhu H
; Xu N
; Liang S
Oncotarget
2016[Nov]; 7
(44
): 71400-71416
PMID27662663
show ga
The STC2 protein involves in carcinogenesis and progression of many cancers. It
remains unclear how STC2 regulates the epithelial-mesenchymal transition (EMT)
process and colorectal cancer (CRC) development. Here we systematically
investigated STC2-activated early occurrence of EMT and CRC cell migration in
vitro, clinical associations of STC2 with CRC development and patient survival.
The secretion and expression level of STC2 were both greatly increased in EMT
cells and CRC cells compared with the normal epithelial NCM460 cells. And the
conditioned media from EMT cells stimulated epithelia and colon cancer cells to
obtain EMT characteristics. STC2 overexpression promoted CRC cell growth and cell
migration in vitro, and STC2 enhanced tumor growth in a mouse CRC-xenograft
model. Corresponding to EMT marker expression changes, several critical signaling
pathway molecules including pERK, pAKT, PI3K and Ras were remarkably increased
either in NCM460 cells transfected with STC2 plasmids or in cells induced with
exogenous STC2 protein. However blocking AKT-ERK signaling pathways attenuated
STC2-activated EMT process. Furthermore the elevated STC2 expressions were also
confirmed in 77 clinical tumor tissues and sera from CRC patients, and the
increased STC2 in tumor tissues and sera correlated with tumor pathologic stage
and poor survival for CRC patients. In conclusion, STC2 promotes CRC
tumorigenesis and EMT progression through activating ERK/MEK and PI3K/AKT
signaling pathways. STC2 protein is also a potential tumor biomarker for CRC
diagnosis and prognosis.