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2015 ; 15
(ä): 706
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MiR-449a suppresses the epithelial-mesenchymal transition and metastasis of
hepatocellular carcinoma by multiple targets
#MMPMID26471185
Chen SP
; Liu BX
; Xu J
; Pei XF
; Liao YJ
; Yuan F
; Zheng F
BMC Cancer
2015[Oct]; 15
(ä): 706
PMID26471185
show ga
BACKGROUND: Increasing evidence indicates that Epithelial-mesenchymal transition
(EMT) can be regulated by microRNAs (miRNAs). MiR-449a is a liver abundant miRNA.
However, the role of miR-449a in the metastasis of hepatocellular carcinoma (HCC)
remains largely unknown. METHODS: The expression levels of miR-449a were first
examined in HCC cell lines and tumour tissues by real-time PCR. The in vitro and
in vivo functional effect and underlying molecular mechanisms of miR-449a were
examined further. RESULTS: In the present study, we found that miR-449a was
significantly decreased in HCC cells and tissues, especially in those with the
portal vein tumor thrombus. In HCC cell lines, stable overexpression of miR-449a
was sufficient to inhibit cell motility in vitro, and pulmonary metastasis in
vivo. In addition, ectopic overexpression of miR-449a in HCC cells promoted the
expression of epithelial markers and reduced the levels of mesenchymal markers.
Further studies revealed that the reintroduction of miR-449a attenuated the
downstream signaling of Met, and consequently reduced the accumulation of Snail
in cell nucleus by targeting the 3'-untranslated regions (3'-UTR) of FOS and Met.
CONCLUSIONS: Our data highlight an important role of miR-449a in the molecular
etiology of HCC, and implicate the potential application of miR-449a in cancer
therapy.