Altered metabolic landscape in IDH‐mutant gliomas affects phospholipid, energy, and oxidative stress pathways

Fack, F. et al. (2017) Altered metabolic landscape in IDH‐mutant gliomas affects phospholipid, energy, and oxidative stress pathways. EMBO Molecular Medicine, 9(12), pp. 1681-1695. (doi: 10.15252/emmm.201707729) (PMID:29054837) (PMCID:PMC5709746)

Abstract

Heterozygous mutations in NADP‐dependent isocitrate dehydrogenases (IDH) define the large majority of diffuse gliomas and are associated with hypermethylation of DNA and chromatin. The metabolic dysregulations imposed by these mutations, whether dependent or not on the oncometabolite D‐2‐hydroxyglutarate (D2HG), are less well understood. Here, we applied mass spectrometry imaging on intracranial patient‐derived xenografts of IDH‐mutant versus IDH wild‐type glioma to profile the distribution of metabolites at high anatomical resolution in situ. This approach was complemented by in vivo tracing of labeled nutrients followed by liquid chromatography–mass spectrometry (LC‐MS) analysis. Selected metabolites were verified on clinical specimen. Our data identify remarkable differences in the phospholipid composition of gliomas harboring the IDH1 mutation. Moreover, we show that these tumors are characterized by reduced glucose turnover and a lower energy potential, correlating with their reduced aggressivity. Despite these differences, our data also show that D2HG overproduction does not result in a global aberration of the central carbon metabolism, indicating strong adaptive mechanisms at hand. Intriguingly, D2HG shows no quantitatively important glucose‐derived label in IDH‐mutant tumors, which suggests that the synthesis of this oncometabolite may rely on alternative carbon sources. Despite a reduction in NADPH, glutathione levels are maintained. We found that genes coding for key enzymes in de novo glutathione synthesis are highly expressed in IDH‐mutant gliomas and the expression of cystathionine‐β‐synthase (CBS) correlates with patient survival in the oligodendroglial subtype. This study provides a detailed and clinically relevant insight into the in vivo metabolism of IDH1‐mutant gliomas and points to novel metabolic vulnerabilities in these tumors.

• Item Type: Articles
• Additional Information: The authors thank Virginie Baus for excellent technical assistance with the animal work and acknowledge the financial contribution of the Luxembourg Institute of Health (Luxembourg) and the Stiftelsen Kristian Gerhard Jebsen (Norway).
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Tardito, Dr Saverio
• Authors: Fack, F., Tardito, S., Hochart, G., Oudin, A., Zheng, L., Fritah, S., Golebiewska, A., Nazarov, P. V., Bernard, A., Hau, A.‐C., Keunen, O., Leenders, W., Lund‐Johansen, M., Stauber, J., Gottlieb, E., Bjerkvig, R., and Niclou, S. P.
• College/School: College of Medical Veterinary and Life Sciences > School of Cancer Sciences
• Journal Name: EMBO Molecular Medicine
• Publisher: EMBO Press
• ISSN: 1757-4686
• ISSN (Online): 1757-4684
• Published Online: 20 October 2017
• Copyright Holders: Copyright © 2018 The Authors
• First Published: First published in EMBO Molecular Medicine 9(12):1681-1695
• Publisher Policy: Reproduced under a Creative Commons License