Abstract
Purpose
Glioblastoma (GBM) remains one of the most lethal primary brain tumors in children and adults. Targeting tumor metabolism has emerged as a promising-targeted therapeutic strategy for GBM and characteristically resistant GBM stem-like cells (GSCs).
Methods
Gene expression data was obtained from the online patient-histology database, GlioVis. GSC mitochondria morphology was examined by TEM. Cell viability and effect on GSC self-renewal was determined via MTS assay and neurosphere assay, respectively. Proteins were evaluated by Western Blot.
Results
Enzymes necessary for ketone catabolism (BDH1, OXCT1 and ACAT1) are significantly downregulated in adult and pediatric GBM. GSC mitochondrial ultrastructure suggested defects in oxidative phosphorylation. Treatment of both GBM and GSC cell lines resulted in dose-dependent decreases in viability in response to glycolytic inhibitor 2-deoxy-D-glucose (2-DG), and ketone body Acetoacetate (AA), but not β-hydroxybutyrate (βHB). AA induced apoptosis was confirmed by western blot analysis, indicating robust caspase activation and PARP cleavage. AA reduced neurosphere formation at concentrations as low as 1 mM. Combined treatment of low dose 2-DG (50 μM) with AA resulted in more cell death than either treatment alone. The effect was greater than additive at low concentrations of AA, reducing viability approximately 50% at 1 mM AA. AA was found to directly upregulate mitochondrial uncoupling protein 2 (UCP2), which may explain this potential drug synergism via multi-faceted inhibition of the glycolytic pathway.
Conclusion
Targeting the metabolic pathway of GBM via glycolytic inhibition in conjunction with ketogenic diet or exogenous ketone body supplementation warrants further investigation as a promising adjunctive treatment to conventional therapy.
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Acknowledgements
We would like to thank our wonderful laboratory volunteers Danisette Torres, Marie Feliu, Wildlif Bayard, Katrina Kostenko, Ingrid Torrens, Wanda Gonzalez, Denis Ortega Ioni, Nelson Abarca, Fedelene Camille, Gabriel Cortez, Jessica Wein, and Michael Cardone for their contributions to our research efforts.
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Mystic Force Foundation provided salary support for RMG and cost of all materials/reagents required for this work.
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Patient-derived cell lines were obtained from resected tumors following Institutional Review Board (IRB) at the University of Miami approval and patient written informed consent.
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Vallejo, F.A., Shah, S.S., de Cordoba, N. et al. The contribution of ketone bodies to glycolytic inhibition for the treatment of adult and pediatric glioblastoma. J Neurooncol 147, 317–326 (2020). https://doi.org/10.1007/s11060-020-03431-w
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DOI: https://doi.org/10.1007/s11060-020-03431-w