Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms13498
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Funding
- National Natural Science Foundation of China [81330079, 81273569, 81401292, 81670553, 81373466, 91313303, 81422050, 91129728]
- Natural Science Foundation of Jiangsu Province [BK20140614]
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Excessive activation of hepatic stellate cells (HSCs) is a key step in liver fibrogenesis. Here we report that CUG-binding protein 1 (CUGBP1) expression is elevated in HSCs and positively correlates with liver fibrosis severity in human liver biopsies. Transforming growth factor-beta (TGF-beta) selectively increases CUGBP1 expression in cultured HSCs in a p38 mitogen-activated protein kinase (MAPK)-dependent manner. Knockdown of CUGBP1 inhibits alpha smooth muscle actin (alpha-SMA) expression and promotes interferon gamma (IFN-gamma) production in HSCs in vitro. We further show that CUGBP1 specifically binds to the 3' untranslated region (UTR) of human IFN-gamma mRNA and promotes its decay. In mice, knockdown of CUGBP1 alleviates, whereas its overexpression exacerbates, bile duct ligation (BDL)-induced hepatic fibrosis. Therefore, CUGBP1-mediated IFN-gamma mRNA decay is a key event for profibrotic TGF-beta-dependent activation of HSCs, and inhibiting CUGBP1 to promote IFN-gamma signalling in activated HSCs could be a novel strategy to treat liver fibrosis.
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