51. Suppression of miR‐199a maturation by HuR is crucial for hypoxia‐induced glycolytic switch in hepatocellular carcinoma
- Author
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Chunfang Gao, Jia Tao Lou, Biao Li, Mo-Fang Liu, Shuang Zhao, Ling Fei Zhang, Ming Hua Lu, Sheng Liang, Yong Li, and Dangsheng Li
- Subjects
Male ,Thyroid Hormones ,Carcinoma, Hepatocellular ,Mice, Nude ,Biology ,PKM2 ,General Biochemistry, Genetics and Molecular Biology ,ELAV-Like Protein 1 ,chemistry.chemical_compound ,Cell Line, Tumor ,Hexokinase ,Animals ,Humans ,Glycolysis ,Molecular Biology ,Mice, Inbred BALB C ,Base Sequence ,General Immunology and Microbiology ,General Neuroscience ,Liver Neoplasms ,Membrane Proteins ,Articles ,Warburg effect ,Cell Hypoxia ,Gene Expression Regulation, Neoplastic ,MicroRNAs ,chemistry ,Biochemistry ,Anaerobic glycolysis ,Cancer cell ,Cancer research ,Carrier Proteins ,Energy source ,Reprogramming ,Neoplasm Transplantation ,Protein Binding - Abstract
Glucose metabolic reprogramming is a hallmark of cancer. Cancer cells rapidly adjust their energy source from oxidative phosphorylation to glycolytic metabolism in order to efficiently proliferate in a hypoxic environment, but the mechanism underlying this switch is still incompletely understood. Here, we report that hypoxia potently induces the RNA-binding protein HuR to specifically bind primary miR-199a transcript to block miR-199a maturation in hepatocellular carcinoma (HCC) cells. We demonstrate that this hypoxia-suppressed miR-199a plays a decisive role in limiting glycolysis in HCC cells by targeting hexokinase-2 (Hk2) and pyruvate kinase-M2 (Pkm2). Furthermore, systemically delivered cholesterol-modified agomiR-199a inhibits [(18)F]-fluorodeoxyglucose uptake and attenuates tumor growth in HCC tumor-bearing mice. These data reveal a novel mechanism of reprogramming of cancer energy metabolism in which HuR suppresses miR-199a maturation to link hypoxia to the Warburg effect and suggest a promising therapeutic strategy that targets miR-199a to interrupt cancerous aerobic glycolysis.
- Published
- 2015