De novo pyrimidine synthesis is a targetable vulnerability in IDH mutant glioma

Cancer Cell. 2022 Sep 12;40(9):939-956.e16. doi: 10.1016/j.ccell.2022.07.011. Epub 2022 Aug 18.

Abstract

Mutations affecting isocitrate dehydrogenase (IDH) enzymes are prevalent in glioma, leukemia, and other cancers. Although mutant IDH inhibitors are effective against leukemia, they seem to be less active in aggressive glioma, underscoring the need for alternative treatment strategies. Through a chemical synthetic lethality screen, we discovered that IDH1-mutant glioma cells are hypersensitive to drugs targeting enzymes in the de novo pyrimidine nucleotide synthesis pathway, including dihydroorotate dehydrogenase (DHODH). We developed a genetically engineered mouse model of mutant IDH1-driven astrocytoma and used it and multiple patient-derived models to show that the brain-penetrant DHODH inhibitor BAY 2402234 displays monotherapy efficacy against IDH-mutant gliomas. Mechanistically, this reflects an obligate dependence of glioma cells on the de novo pyrimidine synthesis pathway and mutant IDH's ability to sensitize to DNA damage upon nucleotide pool imbalance. Our work outlines a tumor-selective, biomarker-guided therapeutic strategy that is poised for clinical translation.

Keywords: DHODH; IDH; cancer metabolism; genetically engineered mouse model; glioma; isocitrate dehydrogenase; pyrimidine nucleotides.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Brain Neoplasms* / drug therapy
  • Brain Neoplasms* / genetics
  • Enzyme Inhibitors / therapeutic use
  • Glioma* / drug therapy
  • Glioma* / genetics
  • Isocitrate Dehydrogenase / genetics
  • Isocitrate Dehydrogenase / metabolism
  • Leukemia*
  • Mice
  • Mutation
  • Pyrimidines / pharmacology
  • Pyrimidines / therapeutic use
  • Salicylanilides
  • Triazoles

Substances

  • Enzyme Inhibitors
  • Pyrimidines
  • Salicylanilides
  • Triazoles
  • Isocitrate Dehydrogenase
  • orludodstat