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CD95 ligand-induced apoptosis of human medulloblastoma cells

M Weller1, M Schuster, T Pietsch

  • 1Department of Neurology, University of Tübingen, Medical School, Germany. michael.weller@uni-tuebingen.de

Cancer Letters
|July 31, 1998
PubMed

Insights

CD95 ligand (CD95L) induces apoptosis in medulloblastoma cells, particularly when combined with interferon-gamma or tumor necrosis factor-alpha. Caspase activity mediates this CD95L-induced cell death, suggesting CD95 as a potential immunochemotherapy target.

Area of Science:

  • Oncology
  • Immunology
  • Cell Biology

Background:

  • Medulloblastoma is the most common pediatric brain tumor.
  • CD95 ligand (CD95L) is a cytotoxic cytokine inducing apoptosis.
  • CD95-mediated apoptosis plays a role in cancer cell death.

Purpose of the Study:

  • To investigate CD95-mediated apoptosis in human medulloblastoma cell lines.
  • To determine the role of CD95L in medulloblastoma cell death.
  • To explore CD95 as a potential therapeutic target.

Main Methods:

  • Treatment of medulloblastoma cell lines (DAOY, MED-1, D-283) with CD95L.
  • Inhibition of RNA and protein synthesis.
  • Preexposure to interferon-gamma (IFN-γ) or tumor necrosis factor-alpha (TNF-α).
  • Assessment of CD95 expression and apoptosis induction.
  • Use of caspase inhibitors to block cytotoxicity.

Main Results:

  • DAOY, MED-1, and D-283 cells showed susceptibility to CD95L-induced apoptosis with inhibited synthesis.
  • Preexposure to IFN-γ or TNF-α enhanced CD95 expression and primed D-283 cells for apoptosis.
  • Caspase inhibitors blocked CD95L-induced cytotoxicity, indicating caspase-mediated death signaling.
  • Medulloblastoma cells coexpressed CD95 and CD95L.

Conclusions:

  • CD95-mediated apoptosis is a viable mechanism for inducing death in medulloblastoma cells.
  • Combination therapy involving CD95 modulation may enhance treatment efficacy.
  • CD95 represents a promising target for medulloblastoma immunochemotherapy.

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