Isocitrate dehydrogenase 1 primes group-3 medulloblastomas for cuproptosis

Cancer Cell. 2025 Jun 9;43(6):1159-1174.e8. doi: 10.1016/j.ccell.2025.04.013. Epub 2025 May 15.

Abstract

MYC-driven group-3 medulloblastomas (MBs) are malignant pediatric brain cancers without cures. To define actionable metabolic dependencies, we identify upregulation of dihydrolipoyl transacetylase (DLAT), the E2-subunit of pyruvate dehydrogenase complex (PDC) in a subset of group-3 MB with poor prognosis. DLAT is induced by c-MYC and targeting DLAT lowers TCA cycle metabolism and glutathione synthesis. We also note upregulation of isocitrate dehydrogenase 1 (IDH1) gene expression in group-3 MB patient tumors and suppression of IDH1 epigenetically reduces c-MYC and downstream DLAT levels in multiple c-MYC amplified cancers. DLAT is a central regulator of cuproptosis (copper-dependent cell death) induced by the copper ionophore elesclomol. DLAT expression in group-3 MB cells correlates with increased sensitivity to cuproptosis. Elesclomol is brain-penetrant and suppresses tumor growth in vivo in multiple group-3 MB animal models. Our data uncover an IDH1/c-MYC dependent vulnerability that regulates DLAT levels and can be targeted to kill group-3 MB by cuproptosis.

Keywords: cancer metabolism; cell death; copper; cuproptosis; elesclomol; epigenetics; pediatric brain tumor; protein lipoylation.

MeSH terms

  • Animals
  • Cell Line, Tumor
  • Cerebellar Neoplasms* / drug therapy
  • Cerebellar Neoplasms* / genetics
  • Cerebellar Neoplasms* / metabolism
  • Cerebellar Neoplasms* / pathology
  • Female
  • Gene Expression Regulation, Neoplastic
  • Humans
  • Hydrazines / pharmacology
  • Isocitrate Dehydrogenase* / genetics
  • Isocitrate Dehydrogenase* / metabolism
  • Medulloblastoma* / drug therapy
  • Medulloblastoma* / enzymology
  • Medulloblastoma* / genetics
  • Medulloblastoma* / metabolism
  • Medulloblastoma* / pathology
  • Mice
  • Proto-Oncogene Proteins c-myc / genetics
  • Proto-Oncogene Proteins c-myc / metabolism
  • Xenograft Model Antitumor Assays

Substances

  • Isocitrate Dehydrogenase
  • IDH1 protein, human
  • Proto-Oncogene Proteins c-myc
  • MYC protein, human
  • Hydrazines