MiR-126-3p suppresses tumor metastasis and angiogenesis of hepatocellular carcinoma by targeting LRP6 and PIK3R2

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• 作者：Chengli Du (1)
  Zhen Lv (1)
  Linping Cao (1)
  Chaofeng Ding (1)
  Owusu-ansah K Gyabaah (1)
  Haiyang Xie (1)
  Lin Zhou (1)
  Jian Wu (1)
  Shusen Zheng (1)
  
  1. Department of Hepatobiliary Surgery ; The First Affiliated Hospital ; Zhejiang University School of Medicine ; Hangzhou ; 310003 ; China
  
• 关键词：MiR ; 126 ; 3p ; Hepatocellular carcinoma (HCC) ; Metastasis ; Angiogenesis ; LRP6 ; PIK3R2
• 刊名：Journal of Translational Medicine
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：12
• 期：1
• 全文大小：2,749 KB
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• 刊物主题：Biomedicine general; Medicine/Public Health, general;
• 出版者：BioMed Central
• ISSN：1479-5876

文摘

Background The deregulation of microRNAs has been reported to play a pivotal role in hepatocellular carcinoma (HCC). MiR-126-3p has been reported to be associated with poor prognosis in HCC. However the underlying mechanism of miR-126-3p in HCC remains unclear. Methods The expression levels of miR-126-3p in HCC tissues and cells were detected by RT-PCR. Transwell assay and capillary tube formation assay were applied to assess the metastasis and angiogenesis in vitro. Nude mice subcutaneous tumor model was used to perform in vivo study. Dual- luciferase reporter assay was conducted to confirm the direct binding of miR-126-3p and target genes. The changes of biomarker protein levels were examined by western blot and Immunohistochemistry. Results We observed that the miR-126-3p expression levels in HCC tissues and cells were significantly down-regulated. Through gain- and loss- of function studies, we showed that miR-126-3p dramatically inhibited HCC cells from migrating and invading extracellular matrix gel and suppressed capillary tube formation of endothelial cells in vitro. Furthermore, overexpression of miR-126-3p significantly reduced the volume of tumor and microvessel density in vivo. LRP6 and PIK3R2 were identified as targets of miR-126-3p. Silencing LRP6 and PIK3R2 had similar effects of miR-126-3p restoration on metastasis and angiogenesis individually in HCC cells. Furthermore, the miR-126-3p level was inversely correlated with LRP6 and PIK3R2 in HCC tissues. In addition, the rescue experiments indicated that the metastasis and angiogenesis functions of miR-126-3p were mediated by LRP6 and PIK3R2. Conclusion Our results demonstrates that deregulation of miR-126-3p contributes to metastasis and angiogenesis in HCC. The restoration of miR-126-3p expression may be a promising strategy for HCC therapy.