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2017 ; 13
(5
): 900-913
Nephropedia Template TP
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SPHK1 (sphingosine kinase 1) induces epithelial-mesenchymal transition by
promoting the autophagy-linked lysosomal degradation of CDH1/E-cadherin in
hepatoma cells
#MMPMID28521610
Liu H
; Ma Y
; He HW
; Zhao WL
; Shao RG
Autophagy
2017[May]; 13
(5
): 900-913
PMID28521610
show ga
SPHK1 (sphingosine kinase 1), a regulator of sphingolipid metabolites, plays a
causal role in the development of hepatocellular carcinoma (HCC) through
augmenting HCC invasion and metastasis. However, the mechanism by which SPHK1
signaling promotes invasion and metastasis in HCC remains to be clarified. Here,
we reported that SPHK1 induced the epithelial-mesenchymal transition (EMT) by
accelerating CDH1/E-cadherin lysosomal degradation and facilitating the invasion
and metastasis of HepG2 cells. Initially, we found that SPHK1 promoted cell
migration and invasion and induced the EMT process through decreasing the
expression of CDH1, which is an epithelial marker. Furthermore, SPHK1 accelerated
the lysosomal degradation of CDH1 to induce EMT, which depended on TRAF2 (TNF
receptor associated factor 2)-mediated macroautophagy/autophagy activation. In
addition, the inhibition of autophagy recovered CDH1 expression and reduced cell
migration and invasion through delaying the degradation of CDH1 in
SPHK1-overexpressing cells. Moreover, the overexpression of SPHK1 produced
intracellular sphingosine-1-phosphate (S1P). In response to S1P stimulation,
TRAF2 bound to BECN1/Beclin 1 and catalyzed the lysine 63-linked ubiquitination
of BECN1 for triggering autophagy. The deletion of the RING domain of TRAF2
inhibited autophagy and the interaction of BECN1 and TRAF2. Our findings define a
novel mechanism responsible for the regulation of the EMT via
SPHK1-TRAF2-BECN1-CDH1 signal cascades in HCC cells. Our work indicates that the
blockage of SPHK1 activity to attenuate autophagy may be a promising strategy for
the prevention and treatment of HCC.