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The IDH1 Mutation-Induced Oncometabolite, 2-Hydroxyglutarate, May Affect DNA Methylation and Expression of PD-L1 in

Luyan Mu1,2, Yu Long1,3, Changlin Yang3

  • 1The Fourth Section of Department of Neurosurgery, The First Affiliated Hospital, Harbin Medical University, Harbin, China.

Frontiers in Molecular Neuroscience
|April 13, 2018
PubMed

Insights

IDH1 mutations in gliomas influence the tumor immune microenvironment and PD-L1 expression. IDH1 wildtype gliomas show suppressed immunity and higher PD-L1, suggesting potential benefit from immune checkpoint inhibitors.

Area of Science:

  • Neuro-oncology
  • Immunology
  • Cancer Genetics

Background:

  • Malignant gliomas are aggressive brain tumors influenced by immunoediting.
  • Immune-checkpoint inhibitors show promise in cancer immunotherapy.
  • Understanding IDH1 mutations' role in glioma immunity is crucial.

Purpose of the Study:

  • To investigate the link between IDH1 mutations, immune landscape, and PD-L1 expression in gliomas.
  • To explore the impact of IDH1 status on tumor immunity and treatment response.

Main Methods:

  • Analysis of paired tumor samples from lower-grade gliomas (LGGs) and glioblastomas (GBMs).
  • Genetic analysis of glioma patient samples from The Cancer Genome Atlas (TCGA) database.
  • Assessment of PD-L1 gene and protein expression and DNA methylation patterns.

Main Results:

  • IDH1 wildtype gliomas exhibit an immunosuppressive landscape and elevated PD-L1 expression compared to IDH1-mutant gliomas.
  • IDH1 wildtype tumors show PD-L1 gene hypomethylation and increased gene/protein expression.
  • IDH1 mutations correlate with increased recurrence-free survival (RFS) and 2-hydroxyglutarate suppresses PD-L1.

Conclusions:

  • IDH1 mutations significantly alter glioma immune infiltration and PD-L1 expression.
  • Immune checkpoint inhibitors may offer therapeutic benefits for IDH1 wildtype gliomas resistant to chemoradiation.
Keywords:
2-hydroxyglutarateDNA methylationIDH mutationPD-L1gliomasimmune checkpoint

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