Hexokinase 2 is a key mediator of aerobic glycolysis and promotes tumor growth in human glioblastoma multiforme
Amparo Wolf,Sameer Agnihotri,Johann Micallef,Joydeep Mukherjee,Nesrin Sabha,Rob A. Cairns,Cynthia Hawkins,Abhijit Guha,Abhijit Guha +8 more
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TLDR
In glioblastoma multiforme, the most common adult primary brain tumor, the glycolytic enzyme hexokinase 2 facilitates growth and therapeutic resistance.Abstract:
Proliferating embryonic and cancer cells preferentially use aerobic glycolysis to support growth, a metabolic alteration commonly referred to as the “Warburg effect.” Here, we show that the glycolytic enzyme hexokinase 2 (HK2) is crucial for the Warburg effect in human glioblastoma multiforme (GBM), the most common malignant brain tumor. In contrast to normal brain and low-grade gliomas, which express predominantly HK1, GBMs show increased HK2 expression. HK2 expression correlates with worse overall survival of GBM patients. Depletion of HK2, but neither HK1 nor pyruvate kinase M2, in GBM cells restored oxidative glucose metabolism and increased sensitivity to cell death inducers such as radiation and temozolomide. Intracranial xenografts of HK2-depleted GBM cells showed decreased proliferation and angiogenesis, but increased invasion, as well as diminished expression of hypoxia inducible factor 1α and vascular endothelial growth factor. In contrast, exogenous HK2 expression in GBM cells led to increased proliferation, therapeutic resistance, and intracranial growth. Growth was dependent on both glucose phosphorylation and mitochondrial translocation mediated by AKT signaling, which is often aberrantly activated in GBMs. Collectively, these findings suggest that therapeutic strategies to modulate the Warburg effect, such as targeting of HK2, may interfere with growth and therapeutic sensitivity of some GBMs.read more
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TL;DR: Recurrent mutations in the active site of isocitrate dehydrogenase 1 (IDH1) occurred in a large fraction of young patients and in most patients with secondary GBMs and were associated with an increase in overall survival.
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IDH1 and IDH2 Mutations in Gliomas
Hai Yan,D. Williams Parsons,Genglin Jin,Roger E. McLendon,B.K. Ahmed Rasheed,Weishi Yuan,Ivan Kos,Ines Batinic-Haberle,Siân Jones,Gregory J. Riggins,Henry S. Friedman,Allan H. Friedman,David A. Reardon,James E. Herndon,Kenneth W. Kinzler,Victor E. Velculescu,Bert Vogelstein,Darell D. Bigner +17 more
TL;DR: Mutations of NADP(+)-dependent isocitrate dehydrogenases encoded by IDH1 and IDH2 occur in a majority of several types of malignant gliomas.