Onco-miR-130 promotes cell proliferation and migration by targeting TGFβR2 in gastric cancer.

Onco-miR-130 promotes cell proliferation and migration by targeting TGFβR2 in gastric cancer.
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Onco-miR-130 通过靶向 TGF beta R2 促进胃癌细胞增殖和迁移

DOI:
10.18632/oncotarget.9936
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发表时间:
2016-07-12
期刊:
影响因子:
--
通讯作者:
Ba Y
Ba Y
中科院分区:
其他
文献类型:
--
作者:
Duan J;Zhang H;Qu Y;Deng T;Huang D;Liu R;Zhang L;Bai M;Zhou L;Ying G;Ba Y

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MicroRNAs(miRNAs)在肿瘤发生中起着重要作用。TGFβ信号通路异常存在于多种肿瘤中,与肿瘤的增殖和转移密切相关。然而,TGFβR2在胃癌中表达失调的机制尚未研究。在本研究中,我们发现TGFβR2蛋白在肿瘤组织中明显受到抑制,而miR-130表达水平在GC组织中显著增加。萤火虫荧光素酶活性检测显示,miR-130可直接与TGFβR2 mRNA的3′UTR结合。同时,miR-130模拟物可降低胃癌细胞TGFβR2的表达水平,而miR-130抑制剂可增强胃癌细胞TGFβR2的表达。随后的功能实验表明,过表达miR-130可促进胃癌细胞的增殖和迁移。siRNA介导的TGFβR2下调可模拟miR-130模拟物对胃癌细胞表型的影响。此外,miR-130的表达水平与上皮-间充质标志物之间存在密切关系。我们的研究结果表明miR-130是一种直接靶向TGFβR2的癌基因。
MicroRNAs (miRNAs) have been proved to play crucial roles in tumorigenesis. TGFβ signal pathway abnormality is found in various cancers and correlates with tumor proliferation and metastasis. However, the mechanisms underlying the dys-regulation of TGFβR2 expression in GC have not been investigated yet. In this study, we found that the TGFβR2 protein was clearly repressed in tumor tissues, while miR-130 expression level was dramatically increased in GC tissues. Firefly luciferase activity assay revealed that miR-130 could directly bind to 3′UTR of TGFβR2 mRNA. Meanwhile, miR-130 mimics lead to the decreased TGFβR2 protein levels, while miR-130 inhibitors enhanced TGFβR2 expression in SGC7901 cells. Subsequent functional experiments showed that overexpressed miR-130 could promote proliferation and migration of SGC7901 cells. And siRNA-mediated TGFβR2 down-regulation could simulate the effects of miR-130 mimics on phenotypes of SGC7901 cells. Furthermore, there existed intense relationship between the expression level of miR-130 and epithelial-mesenchymal markers. Our results demonstrated that miR-130 was an oncogene by directly targeting TGFβR2 in GC.
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