Advanced age negatively impacts survival in an experimental brain tumor model

Erik Ladomersky, Lijie Zhai, Galina Gritsina, Matthew Genet, Kristen L. Lauing, Meijing Wu, C. David James, Derek A. Wainwright*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Glioblastoma (GBM) is the most common primary malignant brain tumor in adults, with an average age of 64 years at the time of diagnosis. To study GBM, a number of mouse brain tumor models have been utilized. In these animal models, subjects tend to range from 6 to 12 weeks of age, which is analogous to that of a human teenager. Here, we examined the impact of age on host immunity and the gene expression associated with immune evasion in immunocompetent mice engrafted with syngeneic intracranial GL261. The data indicate that, in mice with brain tumors, youth conveys an advantage to survival. While age did not affect the tumor-infiltrating T cell phenotype or quantity, we discovered that old mice express higher levels of the immunoevasion enzyme, IDO1, which was decreased by the presence of brain tumor. Interestingly, other genes associated with promoting immunosuppression including CTLA-4, PD-L1 and FoxP3, were unaffected by age. These data highlight the possibility that IDO1 contributes to faster GBM outgrowth with advanced age, providing rationale for future investigation into immunotherapeutic targeting in the future.

Original languageEnglish (US)
Pages (from-to)203-208
Number of pages6
JournalNeuroscience Letters
Volume630
DOIs
StatePublished - Sep 6 2016

Keywords

  • Cancer immunity
  • Glioma
  • Immunosuppression
  • TDO
  • Treg
  • Tryptophan

ASJC Scopus subject areas

  • Neuroscience(all)

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