Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 446, Issue 4, Pages 1255-1260Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2014.03.107
Keywords
Hepatocellular carcinoma (HCC); MicroRNA-145; Insulin receptor substrate 1(IRS1); Akt; Forkhead box protein O1 (FOXO1)
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Funding
- National Natural Science Foundation of China [81000962, 81272281]
- Zhejiang Provincial Public Projects of China [2012C33G2010226]
- Department of Science & Technology of Zhejiang Province [2013C33128]
- Department of Health of Zhejiang Province [201352853]
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Accumulating evidences hive proved that dysregulation of microRNAs (miRNAs) is involved in cancer initiation and progression. In this study, we showed that miRNA-145 level was significantly decreased in hepatocellular cancer (HCC) tissues and cell lines, and its low expression was inversely associated with the abundance of insulin receptor substrate 1 (IRS1), a key mediator in oncogenic insulin-like growth factor (IGF) signaling. We verified IRS1 as a direct target of miR-145 using Western blotting and luciferase reporter assay. Further, the restoration of miR-145 in HCC cell lines suppressed cancer cell growth, owing to down-regulated IAS1 expression and its downstream Akt/FOXO1 signaling. Our results demonstrated that miR-145 could inhibit HCC through targeting IAS1 and its downstream signaling, implicating the loss of miR-145 regulation may be a potential molecular mechanism causing aberrant oncogenic signaling in HCC. (C) 2014 Elsevier Inc. All rights reserved.
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