MicroRNA-31-5p enhances the Warburg effect via targeting FIH

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
Biying ZhuDaoguang Yan

Abstract

The enhanced expression of miR-31 has been observed in many human malignancies including lung cancer, and this microRNA regulates several aspects of oncogenesis. However, the role of miR-31-5p in energy metabolism remains elusive. Here, we confirm that H1299 and A549 cells, 2 lung cancer cell lines, relay on aerobic glycolysis as main source of ATP. Inhibition of miR-31-5p leads to decreased glycolysis and ATP production, while miR-31-5p overexpression increases them. Hypoxia inducible factor 1 (HIF-1) up-regulates the expression of glycolytic enzymes, and the HIF-1α inhibitor (FIH) inhibits HIF-1 activity. Because FIH is a direct target of miR-31-5p, inhibition of miR-31-5p results in enhanced FIH expression and suppression of HIF-1 signaling, while overexpression of miR-31-5p has the opposite effects. Via this mechanism, miR-31-5p up-regulates aerobic glycolytic genes and maintains energy homeostasis. To further validate the mechanism of miR-31-5p in glycolysis regulation, we show that overexpression or knockdown of FIH rescued the effects of miR-31-5p or miR-31-5p inhibitor on HIF activation and its target gene expression, respectively. Finally, by means of an A549 cell xenograft mouse model, we demonstrate that the miR-31-5...Continue Reading

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Apr 3, 2019·International Journal of Molecular Sciences·Kuan-Li WuAnd Jen-Yu Hung
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