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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
MicroRNA-340 inhibits the proliferation and invasion of hepatocellular carcinoma cells by targeting JAK1.
Biochemical and Biophysical Research Communications 2017 January 30
Increasing evidence indicates that dysregulation of microRNAs (miRNAs) contributes to tumorigenesis. MicroRNA-340 (miR-340) is downregulated in several types of cancer. However, the functional mechanism of miR-340 in hepatocellular carcinoma (HCC) remains unclear. Here, we showed that miR-340 was significantly downregulated in HCC tissues and cell lines. Gain-of-function experiments demonstrated that miR-340 overexpression inhibited HCC cell proliferation, migration, and invasion in vitro, and suppressed tumor growth in vivo. Janus kinase 1 (JAK1) was identified as a direct target of miR-340 in HCC cells. Ectopic expression of JAK1 reversed the inhibitory effects of miR-340. Further investigations showed that miR-340 dramatically inhibited the expression of signal transducer and activator of transcription (STAT)3 downstream molecules including Bcl-2, cyclin D1, and matrix metalloprotease (MMP)-2. The present findings indicated that miR-340 suppressed HCC cell proliferation and invasion by regulating the JAK1/STAT3 pathway, suggesting its potential as a novel therapeutic target for HCC.
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