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2016 ; 7
(39
): 63324-63337
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Sphingosine-1-phosphate induced epithelial-mesenchymal transition of
hepatocellular carcinoma via an MMP-7/ syndecan-1/TGF-? autocrine loop
#MMPMID27556509
Zeng Y
; Yao X
; Chen L
; Yan Z
; Liu J
; Zhang Y
; Feng T
; Wu J
; Liu X
Oncotarget
2016[Sep]; 7
(39
): 63324-63337
PMID27556509
show ga
Sphingosine-1-phosphate (S1P) induces epithelial-mesenchymal transition (EMT) in
hepatocellular carcinoma (HCC). However, its underlying mechanism remains largely
unknown. In the present study, we investigated the correlation between S1P and
syndecan-1 in HCC, the molecular mechanism involved, as well as their roles in
EMT of HCC. Results revealed a high serum S1P level presents in patients with
HCC, which positively correlated with the serum syndecan-1 level. A significant
inverse correlation existed between S1P1 and syndecan-1 in HCC tissues. S1P
elicits activation of the PI3K/AKT signaling pathways via S1P1, which triggers
HPSE, leading to increases in expression and activity of MMP-7 and leading to
shedding and suppression of syndecan-1. The loss of syndecan-1 causes an increase
in TGF-?1 production. The limited chronic increase in TGF-?1 can convert HCC
cells into a mesenchymal phenotype via establishing an MMP-7/Syndecan-1/TGF-?
autocrine loop. Finally, TGF-?1 and syndecan-1 are essential for S1P-induced
epithelial to mesenchymal transition. Taken together, our study demonstrates that
S1P induces advanced tumor phenotypes of HCC via establishing an
MMP-7/syndecan-1/TGF-?1 autocrine loop, and implicates targetable
S1P1-PI3K/AKT-HPSE-MMP-7 signaling axe in HCC metastasis.