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2015 ; 7
(8
): 1390-403
Nephropedia Template TP
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MiR-133a suppresses the migration and invasion of esophageal cancer cells by
targeting the EMT regulator SOX4
#MMPMID26396670
Li S
; Qin X
; Li Y
; Zhang X
; Niu R
; Zhang H
; Cui A
; An W
; Wang X
Am J Transl Res
2015[]; 7
(8
): 1390-403
PMID26396670
show ga
MicroRNAs (miRNAs) are small, non-coding RNAs which can function as oncogenes or
tumor suppressor genes in human cancers. In the present study, we demonstrated
that the expression ofmiR-133a was dramatically decreased in examined esophageal
squamous cell carcinoma (ESCC) cell lines and clinical ESCC tissue samples.
Additionally, miR-133a expression was inversely correlated with tumor progression
in ESCCs. We have found that over-expression of miR-133a significantly suppressed
the proliferation, migration and invasion of ESCC cells in vitro. miR-133a
over-expression also significantly suppressed the aggressive phenotype of ESCC in
vivo, suggesting that miR-133a may function as a novel tumor suppressor. Further
studies indicated that the EMT-related transcription factor Sox4 was a direct
target gene of miR-133a, evidenced by the direct binding of miR-133a with the
3'UTR of Sox4. Notably, the EMT marker E-cadherin or vimentin, a downstream of
Sox4, was also down-regulated or upregulated upon miR-133a treatment. We have
also shown that over-expressing or silencing Sox4 was able to elevate or inhibit
the migration and invasion of ESCC cells, similar to the effect of miR-133a on
the ESCC cells. Moreover, knockdown of Sox4 reversed the enhanced migration and
invasion mediated by anti-miR-133a. These results demonstrate that miR-133a acts
as a tumor suppressor in ESCC through targeting Sox4 and the EMT process.
miR-133a may serve as a potential target in the treatment of human esophageal
cancer.