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2015 ; 34
(21
): 2671-85
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Suppression of miR-199a maturation by HuR is crucial for hypoxia-induced
glycolytic switch in hepatocellular carcinoma
#MMPMID26346275
Zhang LF
; Lou JT
; Lu MH
; Gao C
; Zhao S
; Li B
; Liang S
; Li Y
; Li D
; Liu MF
EMBO J
2015[Nov]; 34
(21
): 2671-85
PMID26346275
show ga
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.