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Cyclosporine a induces growth arrest or programmed cell death of human glioma cells

Agata Zupanska1, Magdalena Dziembowska, Aleksandra Ellert-Miklaszewska

  • 1Laboratory of Transcription Regulation, Department Cell Biology, Nencki Institute of Experimental Biology, Warsaw, Poland.

Neurochemistry International
|August 10, 2005
PubMed

Insights

Cyclosporine A (CsA) induces growth arrest or programmed cell death in human malignant glioma cells, offering a novel therapeutic strategy for drug-resistant gliomas. This compound bypasses conventional treatment resistance mechanisms.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Human malignant gliomas exhibit high resistance to conventional therapies.
  • Cyclosporine A (CsA) previously showed apoptotic effects in rat glioma cells.

Purpose of the Study:

  • To investigate the effects of CsA on human malignant glioma cells.
  • To elucidate the mechanisms underlying CsA-induced growth arrest and cell death.

Main Methods:

  • Treatment of human glioma cell lines (U87-MG, U373, T98G) with CsA.
  • Analysis of cell cycle inhibitor p21Cip1/Waf1 accumulation.
  • Assessment of senescence, cell morphology, caspase activation, and PARP cleavage.
  • Evaluation of effects with cycloheximide (CHX) and assessment of fasL expression and mitochondrial membrane potential.

Main Results:

  • CsA induced p21Cip1/Waf1 accumulation in glioma cells, irrespective of p53 status.
  • Senescence-associated growth arrest occurred in U87-MG cells (p53 functional).
  • Programmed cell death, characterized by morphological changes and caspase activation, was observed in U373 and T98G cells (p53 mutated).
  • CsA-induced cell death in T98G cells was inhibited by cycloheximide, suggesting a protein synthesis-dependent mechanism.
  • CsA did not affect fasL expression or mitochondrial membrane potential.

Conclusions:

  • CsA triggers either growth arrest or non-apoptotic programmed cell death in human malignant glioma cells.
  • The mechanisms employed by CsA differ from conventional radio- and chemotherapeutics.
  • CsA demonstrates efficacy even in cells resistant to standard treatments, suggesting potential as a novel therapeutic strategy or adjunct therapy for drug-resistant gliomas.

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