CREB up-regulates long non-coding RNA, HULC expression through interaction with microRNA-372 in liver cancer
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ID: 299740
2010
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Abstract
Long non-coding RNA (lncRNA), highly up-regulated in liver cancer (HULC) plays an important role in tumorigenesis. Depletion of HULC resulted in a significant deregulation of several genes involved in liver cancer. Although up-regulation of HULC expression in hepatocellular carcinoma has been reported, the molecular mechanisms remain unknown. In this study, we used in vivo and in vitro approaches to characterize cancer-dependent alterations in the chromatin organization and find a CREB binding site (encompassing from −67 to −53 nt) in the core promoter. Besides, we also provided evidence that PKA pathway may involved in up-regulation of HULC. Furthermore, we demonstrated HULC may act as an endogenous 'sponge', which down-regulates a series of microRNAs (miRNAs) activities, including miR-372. Inhibition of miR-372 leads to reducing translational repression of its target gene, PRKACB, which in turn induces phosphorylation of CREB. Over-expression of miR-372 decreases the association of CREB with the proximal promoter, followed by the dissociation of P300, resulting in a change of the histone 'code', such as in deacetylation and methylation. The study elucidates that fine tuning of HULC expression is part of an auto-regulatory loop in which it's inhibitory to expression and activity of miR-372 allows lncRNA up-regulated expression in liver cancer.
| Reference Key |
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|---|---|
| Authors | Jiayi Wang, Xiangfan Liu, Huacheng Wu, Peihua Ni, Zhidong Gu, Yongxia Qiao, Ning Chen, Fenyong Sun, Qishi Fan |
| Journal | Nucleic Acids Research |
| Year | 2010 |
| DOI |
10.1093/nar/gkq285
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| URL | |
| Keywords | Keywords not found |
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