Francesca Branzoli1,2, Clément Pontoizeau3, Lucien Tchara3, Anna Luisa Di Stefano4,5, Aurélie Kamoun6, Dinesh K Deelchand7, Romain Valabrègue1,2, Stéphane Lehéricy1,2, Marc Sanson2,4,8, Chris Ottolenghi3, Małgorzata Marjańska7. 1. Brain and Spine Institute, Center for Neuroimaging Research (CENIR), Paris, France. 2. Sorbonne University, Paris, France. 3. Metabolomics Unit, Department of Biology, Reference Center for Metabolic Diseases, Necker Hospital and University of Paris Descartes, Paris, France. 4. Department of Neurology, Public Assistance-Hospital of Paris, University Hospital Pitié-Salpêtrière, Paris, France. 5. Department of Neurology, Foch Hospital, Suresnes, France. 6. Tumor ID Card Program, National League Against Cancer, Paris, France. 7. Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, Minneapolis, Minnesota, USA. 8. The Tumorotheque, Brain and Spine Institute, Paris, France.
Abstract
BACKGROUND: Codeletion of chromosome arms 1p and 19q (1p/19q codeletion) highly benefits diagnosis and prognosis in gliomas. In this study, we investigated the effect of 1p/19q codeletion on cancer cell metabolism and evaluated possible metabolic targets for tailored therapies. METHODS: We combined in vivo 1H (proton) magnetic resonance spectroscopy (MRS) measurements in human gliomas with the analysis of a series of standard amino acids by liquid chromatography-mass spectroscopy (LC-MS) in human glioma biopsies. Sixty-five subjects with low-grade glioma were included in the study: 31 underwent the MRI/MRS examination, 47 brain tumor tissue samples were analyzed with LC-MS, and 33 samples were analyzed for gene expression with quantitative PCR. Additionally, we performed metabolic tracer experiments in cell models with 1p deletion. RESULTS: We report the first in vivo detection of cystathionine by MRS in 1p/19q codeleted gliomas. Selective accumulation of cystathionine was observed in codeleted gliomas in vivo, in brain tissue samples, as well as in cells harboring heterozygous deletions for serine- and cystathionine-pathway genes located on 1p: phosphoglycerate dehydrogenase (PHGDH) and cystathionine gamma-lyase (CTH). Quantitative PCR analyses showed 40-50% lower expression of both PHGDH and CTH in 1p/19q codeleted gliomas compared with their non-codeleted counterparts. CONCLUSIONS: Our results provide strong evidence of a selective vulnerability of codeleted gliomas to serine and glutathione depletion and point to cystathionine as a possible noninvasive marker of treatment response.
BACKGROUND: Codeletion of chromosome arms 1p and 19q (1p/19q codeletion) highly benefits diagnosis and prognosis in gliomas. In this study, we investigated the effect of 1p/19q codeletion on cancer cell metabolism and evaluated possible metabolic targets for tailored therapies. METHODS: We combined in vivo 1H (proton) magnetic resonance spectroscopy (MRS) measurements in humangliomas with the analysis of a series of standard amino acids by liquid chromatography-mass spectroscopy (LC-MS) in humanglioma biopsies. Sixty-five subjects with low-grade glioma were included in the study: 31 underwent the MRI/MRS examination, 47 brain tumor tissue samples were analyzed with LC-MS, and 33 samples were analyzed for gene expression with quantitative PCR. Additionally, we performed metabolic tracer experiments in cell models with 1p deletion. RESULTS: We report the first in vivo detection of cystathionine by MRS in 1p/19q codeleted gliomas. Selective accumulation of cystathionine was observed in codeleted gliomas in vivo, in brain tissue samples, as well as in cells harboring heterozygous deletions for serine- and cystathionine-pathway genes located on 1p: phosphoglycerate dehydrogenase (PHGDH) and cystathionine gamma-lyase (CTH). Quantitative PCR analyses showed 40-50% lower expression of both PHGDH and CTH in 1p/19q codeleted gliomas compared with their non-codeleted counterparts. CONCLUSIONS: Our results provide strong evidence of a selective vulnerability of codeleted gliomas to serine and glutathione depletion and point to cystathionine as a possible noninvasive marker of treatment response.
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