Abstract:
BACKGROUND:Recent profile studies of microRNA (miRNA) expression have documented a deregulation of miRNA (miR-124) in hepatocellular carcinoma (HCC). OBJECTIVE:To determine the status of miR-124 expression and its underlying mechanisms in the pathogenesis of HCC. METHODS:The expression levels of miR-124 were first examined in HCC cell lines and tumour tissues by real-time PCR. The in vitro and in vivo functional effect of miR-124 was examined further. A luciferase reporter assay was conducted to confirm target associations. RESULTS:The expression levels of miR-124 were frequently reduced in HCC cells and tissues, and low-level expression of miR-124 was significantly associated with a more aggressive and/or poor prognostic phenotype of patients with HCC (p<0.05). In HCC cell lines, stable overexpression of miR-124 was sufficient to inhibit cell motility and invasion in vitro, and suppress intrahepatic and pulmonary metastasis in vivo. In addition, ectopic overexpression of miR-124 in HCC cells inhibited epithelial-mesenchymal cell transition, formation of stress fibres, filopodia and lamellipodia. Further studies showed that miR-124 could directly target the 3'-untranslated region (3'-UTR) of both ROCK2 and EZH2 mRNAs, and suppress their mRNA and protein expressions. These findings suggest that miR-124 plays a critical role in regulating cytoskeletal events and epithelial-mesenchymal cell transition and, ultimately, inhibits the invasive and/or metastatic potential of HCC, probably by its direct target on ROCK2 and EZH2 genes. These results provide functional and mechanistic links between the tumour suppressor miRNA-124 and the two oncogenes ROCK2 and EZH2 on the aggressive nature of HCC. CONCLUSION:These data highlight an important role for miR-124 in the regulation of invasion and metastasis in the molecular aetiology of HCC, and suggest a potential application of miR-124 in prognosis prediction and cancer treatment.
journal_name
Gutjournal_title
Gutauthors
Zheng F,Liao YJ,Cai MY,Liu YH,Liu TH,Chen SP,Bian XW,Guan XY,Lin MC,Zeng YX,Kung HF,Xie Ddoi
10.1136/gut.2011.239145subject
Has Abstractpub_date
2012-02-01 00:00:00pages
278-89issue
2eissn
0017-5749issn
1468-3288pii
gut.2011.239145journal_volume
61pub_type
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