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Updated: Jan 27, 2026

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Inhibitor of Apoptosis Proteins Determines Glioblastoma Stem-Like Cell Fate in an Oxygen-Dependent Manner

Aurélie Soubéran1, Jessica Cappaï1, Mathieu Chocry1

  • 1Aix-Marseille University, CNRS, INP, Institute of NeuroPhysiopathology, Marseille, France.

Stem Cells (Dayton, Ohio)
|March 29, 2019
PubMed

Insights

In glioblastoma, inhibiting apoptosis inhibitor proteins (IAPs) under hypoxia triggers cancer stem cell death and reduces proliferation. This dual action, dependent on oxygen levels, offers new therapeutic strategies for brain tumors.

Area of Science:

  • Oncology
  • Cancer Stem Cell Biology
  • Molecular Therapeutics

Background:

  • Apoptosis inhibitor proteins (IAPs) play roles in glioblastoma (GBM) cell survival and stemness.
  • Previous research indicated IAP inhibition promotes GBM stem cell differentiation via nuclear factor-κB under normoxia.
  • Hypoxia significantly influences drug efficacy and cancer cell behavior.

Purpose of the Study:

  • To investigate the role of IAPs in maintaining glioblastoma stem-like cells under hypoxic conditions.
  • To explore the effects of IAP inhibition on glioblastoma stem-like cell fate in a hypoxic environment.

Main Methods:

  • Utilized GDC-0152, a small-molecule IAP inhibitor, on four human glioblastoma cell lines.
  • Employed a three-dimensional glioblastoma spheroid model with time-of-flight secondary ion mass spectrometry to assess oxygen gradients.
  • Confirmed oxygen-dependent effects on human glioblastoma explants.

Main Results:

  • IAP inhibition with GDC-0152 induced apoptosis and decreased proliferation in glioblastoma stem-like cells under hypoxia.
  • 3D spheroid models showed distinct cell populations correlating with oxygen levels (hypoxic core vs. periphery).
  • Hypoxic IAP inhibition activated ataxia telangiectasia and Rad3-related protein signaling.

Conclusions:

  • IAP inhibition exhibits oxygen-dependent anti-tumoral effects in glioblastoma.
  • The findings reveal a dual mechanism of action for IAP inhibitors based on oxygen levels.
  • These insights are crucial for optimizing therapeutic applications of IAP inhibitors in hypoxic tumors.
Keywords:
ATRGlioblastoma stem-like cellsHypoxiaIAP proteinsTNFα

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