Article (Scientific journals)
Increased mitochondrial activity in a novel IDH1-R132H mutant human oligodendroglioma xenograft model: in situ detection of 2-HG and α-KG.
Navis, Anna C; NICLOU, Simone P.; Fack, Fred et al.
2013In Acta Neuropathologica Communications, 1, p. 18
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Keywords :
Glutarates; Ketoglutaric Acids; alpha-hydroxyglutarate; EC 1.1.1.41 (Isocitrate Dehydrogenase); EC 1.1.1.42. (IDH1 protein, human); Animals; Brain/pathology/physiopathology; Brain Neoplasms/genetics/pathology/physiopathology; Cells, Cultured; Female; Glutarates/metabolism; Humans; Isocitrate Dehydrogenase/genetics/metabolism; Ketoglutaric Acids/metabolism; Mice, Inbred BALB C; Mitochondria/physiology; Mutation, Missense; Neoplasm Transplantation; Oligodendroglioma/genetics/pathology/physiopathology
Abstract :
[en] BACKGROUND: Point mutations in genes encoding NADP+-dependent isocitrate dehydrogenases (especially IDH1) are common in lower grade diffuse gliomas and secondary glioblastomas and occur early during tumor development. The contribution of these mutations to gliomagenesis is not completely understood and research is hampered by the lack of relevant tumor models. We previously described the development of the patient-derived high-grade oligodendroglioma xenograft model E478 that carries the commonly occurring IDH1-R132H mutation. We here report on the analyses of E478 xenografts at the genetic, histologic and metabolic level. RESULTS: LC-MS and in situ mass spectrometric imaging by LESA-nano ESI-FTICR revealed high levels of the proposed oncometabolite D-2-hydroxyglutarate (D-2HG), the product of enzymatic conversion of α-ketoglutarate (α-KG) by IDH1-R132H, in the tumor but not in surrounding brain parenchyma. α-KG levels and total NADP+-dependent IDH activity were similar in IDH1-mutant and -wildtype xenografts, demonstrating that IDH1-mutated cancer cells maintain α-KG levels. Interestingly, IDH1-mutant tumor cells in vivo present with high densities of mitochondria and increased levels of mitochondrial activity as compared to IDH1-wildtype xenografts. It is not yet clear whether this altered mitochondrial activity is a driver or a consequence of tumorigenesis. CONCLUSIONS: The oligodendroglioma model presented here is a valuable model for further functional elucidation of the effects of IDH1 mutations on tumor metabolism and may aid in the rational development of novel therapeutic strategies for the large subgroup of gliomas carrying IDH1 mutations.
Disciplines :
Oncology
Author, co-author :
Navis, Anna C;  Department of Pathology, Radboud University Nijmegen Medical Centre, PO Box 9101, Nijmegen, 6500 HB, The Netherlands. W.Leenders@pathol.umcn.nl.
NICLOU, Simone P. ;  Centre de Recherche Public de la Santé (CRP-Santé), Department of Oncology, NorLux Neuro-Oncology Laboratory, Luxembourg, Luxembourg
Fack, Fred
Stieber, Daniel
van Lith, Sanne
Verrijp, Kiek
Wright, Alan
Stauber, Jonathan
Tops, Bastiaan
Otte-Holler, Irene
Wevers, Ron A
van Rooij, Arno
Pusch, Stefan
von Deimling, Andreas
Tigchelaar, Wikky
van Noorden, Cornelis J F
Wesseling, Pieter
Leenders, William P J
More authors (8 more) Less
External co-authors :
yes
Language :
English
Title :
Increased mitochondrial activity in a novel IDH1-R132H mutant human oligodendroglioma xenograft model: in situ detection of 2-HG and α-KG.
Publication date :
29 May 2013
Journal title :
Acta Neuropathologica Communications
eISSN :
2051-5960
Publisher :
BioMed Central, United Kingdom
Volume :
1
Pages :
18
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 19 February 2024

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