Overexpression of miR-370 and downregulation of its novel target TGFΒ-RII contribute to the progression of gastric carcinoma

S. S. Lo*, P. S. Hung, J. H. Chen, H. F. Tu, W. L. Fang, C. Y. Chen, W. T. Chen, N. R. Gong, C. W. Wu


研究成果: Article同行評審

97 引文 斯高帕斯(Scopus)


MicroRNAs (miRNAs) are endogenous non-coding RNAs that are known to be involved in the pathogenesis of tumors. Gastric carcinoma (GC) is a common malignancy worldwide. The aim of this study was the identification of the expression signature and functional roles of aberrant miRNAs in GC. Initial screening established a profile of aberrantly expressed miRNAs in tumors. miR-370 was confirmed to be overexpressed in GC tissues. Higher expression of miR-370 in GC tissues was associated with more advanced nodal metastasis and a higher clinical stage compared with controls. In addition, significantly higher level of miR-370 was noted in the plasma of GC patients compared with controls. Patients having more invasive or advanced tumors also exhibited a higher plasma level of miR-370. In vitro assays indicated that exogenous miR-370 expression enhanced the oncogenic potential of GC cells. The AGS-GFPM2 cells with exogenous miR-370 expression also exhibited enhanced abdominal metastatic dissemination in nude mice. Reporter assays confirmed that miR-370 targeted predicted sites in 3′UTR of transforming growth factor-Β receptor II (TGFΒ-RII) gene. The exogenous miR-370 expression decreased TGFΒ-RII expression and the phosphorylation of Smad3 elicited by TGFΒ1. The TGFΒ1-mediated repression in cell migration was reverted by exogenous miR-370 expression. A reverse correlation between miR-370 and TGFΒ-RII expression was noted in GC tissues. This study concludes that miR-370 is a miRNA that is associated with GC progression by downregulating TGFΒ-RII. The miRNA expression profile described in this study should contribute to future studies on the role of miRNAs in GC.

頁(從 - 到)226-237
出版狀態Published - 12 1月 2012


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