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2018 ; 9
(2
): 136
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SIRT1 induces epithelial-mesenchymal transition by promoting autophagic
degradation of E-cadherin in melanoma cells
#MMPMID29374154
Sun T
; Jiao L
; Wang Y
; Yu Y
; Ming L
Cell Death Dis
2018[Jan]; 9
(2
): 136
PMID29374154
show ga
Melanoma is highly metastatic, and understanding of its molecular mechanism is
urgently needed for the development of therapeutic targets and prognostic
assessment for metastatic melanoma. SIRT1 is a nicotinamide adenine dinucleotide
(NAD(+))-dependent protein deacetylase, belonging to the mammalian sirtuin
family. It has been reported that SIRT1 is associated with metastasis in various
cancers. However, the molecular mechanism of SIRT1 in melanoma metastasis remains
to be clarified. Here we report that SIRT1 induces the epithelial-mesenchymal
transition (EMT) by accelerating E-cadherin degradation via autophagy and
facilitates melanoma metastasis. Initially, we found that SIRT1 expression was
frequently elevated in metastatic melanoma compared with primary melanoma. In
addition, SIRT1 induced the EMT and promoted cell migration and invasion by
decreasing E-cadherin expression. Further work demonstrated that SIRT1
accelerated the autophagic degradation of E-cadherin through deacetylation of
Beclin 1. In addition, inhibition of autophagy recovered E-cadherin expression
and suppressed cell migration and invasion by delaying the degradation of
E-cadherin in SIRT1-overexpressing cells. Overall, our findings reveal a novel
molecular mechanism for SIRT1 in melanoma metastasis, indicating that SIRT1 may
serve as a viable therapeutic target for metastatic melanoma.