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2016 ; 35
(1
): 98
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Inhibition of SALL4 reduces tumorigenicity involving epithelial-mesenchymal
transition via Wnt/?-catenin pathway in esophageal squamous cell carcinoma
#MMPMID27329034
He J
; Zhou M
; Chen X
; Yue D
; Yang L
; Qin G
; Zhang Z
; Gao Q
; Wang D
; Zhang C
; Huang L
; Wang L
; Zhang B
; Yu J
; Zhang Y
J Exp Clin Cancer Res
2016[Jun]; 35
(1
): 98
PMID27329034
show ga
BACKGROUND: Growing evidence suggests that SALL4 plays a vital role in tumor
progression and metastasis. However, the molecular mechanism of SALL4 promoting
esophageal squamous cell carcinoma (ESCC) remains to be elucidated. METHODS: The
gene and protein expression profiles- were examined by using quantitative
real-time PCR, immunohistochemistry and western blotting. Small hairpin RNA was
used to evaluate the role of SALL4 both in cell lines and in animal models. Cell
proliferation, apoptosis and invasion were assessed by CCK8, flow cytometry and
transwell-matrigel assays. Sphere formation assay was used for cancer stem cell
derivation and characterization. RESULTS: Our study showed that the transcription
factor SALL4 was overexpressed in a majority of human ESCC tissues and closely
correlated with a poor outcome. We established the lentiviral system using short
hairpin RNA to knockdown SALL4 in TE7 and EC109 cells. Silencing of SALL4
inhibited the cell proliferation, induced apoptosis and the G1 phase arrest in
cell cycle, decreased the ability of migration/invasion, clonogenicity and
stemness in vitro. Besides, down-regulation of SALL4 enhanced the ESCC cells'
sensitivity to cisplatin. Xenograft tumor models showed that silencing of SALL4
decreased the ability to form tumors in vivo. Furthermore, our study demonstrated
that SALL4 played a vital role in modulating the stemness of ESCC cells via
Wnt/?-catenin signaling pathway and in epithelial-mesenchymal transition.
CONCLUSIONS: Our results revealed that SALL4 might serve as a functional marker
for ESCC cancer stem cell, a crucial marker for prognosis and an attractive
candidate for target therapy of ESCC.