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Inhibition of miR-324-5p increases PM20D1-mediated white and brown adipose loss and reduces body weight in juvenile mice.

Eur. J. Pharmacol.2019 Nov 15;863:172708. Epub 2019 Sep 27
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摘要


Obesity is a serious public health problem characterized by abnormal or excessive fat accumulation, which is caused by an energy imbalance between calories consumed and calories expended. MiRNAs have been involved in the regulation of occurrence and progression of obesity. This study aims to investigate the role of miR-324-5p in regulating the adipose tissue mass and preliminarily probe into its effect on progression of obesity. MiR-324-5p was upregulated in the epididymal white adipose tissues (eWAT), inguinal white adipose tissues (iWAT) and brown adipose tissues (BAT) of the mice fed with high fat diet (HFD). Under room temperature (RT) or thermoneutrality (TN) condition, when tail intravenously injected with miR-324-5p antagomir (anta-miR-324-5p), the fat mass and total weight of mice were both significantly suppressed. The suppressive effect was more distinct under TN than RT. The weight of iWAT and BAT were both inhibited by anta-miR-324-5p under TN. Moreover, PM20D1 was a direct target gene of miR-324-5p. In primary iWAT cells, the expression of PM20D1 was significantly increased by anta-miR-324-5p, whereas decreased by the miR-324-5p mimic. Furthermore, anta-miR-324-5p noticeably increased the cellular oxygen consumption in primary BAT and iWAT cells. Our findings indicated that inhibition of miR-324-5p increased PM20D1-mediated fat consumption and reduced body weight in mice, suggesting that miR-324-5p may be a novel therapeutic target against obesity.

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