Abstract
Mutations in the gene isocitrate dehydrogenase 1 (IDH1) are present in up to 86% of grade II and III gliomas and secondary glioblastoma. Arginine 132 (R132) mutations in the enzyme IDH1 result in excess production of the metabolite 2-hydroxyglutarate (2HG), which could be used as a biomarker for this subset of gliomas. Here, we use optimized in vivo spectral-editing and two-dimensional (2D) correlation magnetic resonance spectroscopy (MRS) methods to unambiguously detect 2HG noninvasively in glioma patients with IDH1 mutations. By comparison, fitting of conventional 1D MR spectra can provide false-positive readouts owing to spectral overlap of 2HG and chemically similar brain metabolites, such as glutamate and glutamine. 2HG was also detected using 2D high-resolution magic angle spinning MRS performed ex vivo on a separate set of glioma biopsy samples. 2HG detection by in vivo or ex vivo MRS enabled detailed molecular characterization of a clinically important subset of human gliomas. This has implications for diagnosis as well as monitoring of treatments targeting mutated IDH1.
MeSH Terms
Adult
Aged
Biopsy
Brain Neoplasms/enzymology,genetics,metabolism,pathology
Epilepsy/pathology
Female
Glioma/enzymology,genetics,metabolism,pathology
Glutarates/metabolism
Humans
Isocitrate Dehydrogenase/genetics
Magnetic Resonance Spectroscopy/methods
Male
Middle Aged
Mutation/genetics
Phantoms, Imaging
Young Adult
Chemicals
Glutarates
alpha-hydroxyglutarate
Isocitrate Dehydrogenase
IDH1 protein, human
Authors & Affiliations
8 authors, click to expand affiliations / ORCID
Andronesi Ovidiu C
Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA. ovidiu@nmr.mgh.harvard.edu
Kim Grace S
Gerstner Elizabeth
Batchelor Tracy
Tzika Aria A
Fantin Valeria R
Vander Heiden Matthew G
Sorensen A Gregory
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