Journal
BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR BASIS OF DISEASE
Volume 1863, Issue 12, Pages 3087-3094Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbadis.2017.09.020
Keywords
Non-alcoholic fatty liver disease; miR-194; Inflammation; FXR/Nr1h4
Funding
- Health and Family Planning Commission of Shenzhen Municipality [SZBC2017014]
- Basic medical and health research project of Baoan District [2017JD184]
- Science and Technology Planning Project of Shenzhen [JCYJ20140415151845365]
- Nature Science Foundation of Guangdong Province [2015A030313825]
- Scientific Research Fund of Southern Medical University [C1033337]
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Non-alcoholic fatty liver disease (NAFLD) affects obesity-associated metabolic syndrome, which exhibits hepatic steatosis, insulin insensitivity and glucose intolerance. Previous studies indicated that hepatic microRNAs (miRs) play critical roles in the development of NAFLD. In this study, we aim to explore the pathophysiological role of miR-194 in obesity-mediated metabolic dysfunction. Our findings show that the high fat diet or palmitic acid treatment significantly increase hepatic miR-194 levels in vivo and in vitro. Silence of miR-194 protects palmitic acid-induced inflammatory response in cultured hepatocytes, and attenuates structural disorders, lipid deposits and inflammatory response in fatty liver. MiR-194 inhibitor also improves glucose and insulin intolerance in obese mice. Through dual luciferase assay, we demonstrate that miR-194 directly binds to FXR/Nr1h4 3'-UTR, and inhibits gene expression of FXR/Nr1h4. Furthermore, overexpression of miR-194 downregulates FXR/Nr1h4 in cultured hepatocytes, but miR-194 inhibitor reversely increases FXR/Nr1h4 expression in obese mouse liver tissues. On the contrast, silence of FXR/Nr1h4 abolishes the hepatic benefits in obese mice treated with miR-194 inhibitor. Present study provides a novel finding that suppression of miR-194 attenuates dietary-induced NAFLD via upregulation of FXR/Nr1h4. The findings suggest miR-194/FXR are potential diagnostic markers and therapeutic targets for NAFLD.
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