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2018 ; 9
(6
): 625
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Gamma synuclein is a novel Twist1 target that promotes TGF-?-induced cancer cell
migration and invasion
#MMPMID29795373
Shao T
; Song P
; Hua H
; Zhang H
; Sun X
; Kong Q
; Wang J
; Luo T
; Jiang Y
Cell Death Dis
2018[May]; 9
(6
): 625
PMID29795373
show ga
Transforming growth factor ? (TGF-?) is critical for embryonic development, adult
tissue homeostasis, and tumor progression. TGF-? suppresses tumors at early
stage, but promotes metastasis at later stage through oncogenes such as Twist1.
Gamma-synuclein (SNCG) is overexpressed in a variety of invasive and metastatic
cancer. Here, we show that TGF-? induces SNCG expression by Smad-Twist1 axis,
thus promoting TGF-?- and Twist1-induced cancer cell migration and invasion. We
identify multiple Twist1-binding sites (E-boxes) in SNCG promoter. Chromatin
immunoprecipitation and luciferase assays confirm the binding of Twist1 to the
E-boxes of SNCG promoter sequence (-129/-1026?bp). Importantly, the
Twist1-binding site close to the transcription initiation site is critical for
the upregulation of SNCG expression by TGF-? and Twist1. Mutations of Twist1
motif on the SNCG promoter constructs markedly reduces the promoter activity. We
further show that TGF-? induces Twist1 expression through Smad thereby enhancing
the binding of Twist1 to SNCG promoter, upregulating SNCG promoter activity and
increasing SNCG expression. SNCG knockdown abrogates TGF-?- or Twist1-induced
cancer cell migration and invasion. Finally, SNCG knockdown inhibits the
promotion of cancer metastasis by Twist1. Together, our data demonstrate that
SNCG is a novel target of TGF-?-Smad-Twist1 axis and a mediator of Twist1-induced
cancer metastasis.