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CML and apoptosis: the ceramide pathway

V Maguer-Satta1

  • 1Inserm U453, Groupe Hématopoïèse, Centre Léon Bérard, Lyon, France.

Hematology and Cell Therapy
|December 9, 1998
PubMed
Summary

Chronic Myeloid Leukemia (CML) cells resist apoptosis but are sensitive to ceramide analogues. Bcr-Abl protein accelerates ceramide-induced apoptosis via PI3 kinase signaling, offering new therapeutic insights.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Death Research

Background:

  • Neoplastic progenitors in Chronic Myeloid Leukemia (CML) exhibit increased proliferation and resistance to apoptosis upon growth factor withdrawal.
  • The Bcr-Abl fusion protein is a key driver in CML pathogenesis, contributing to uncontrolled cell growth and survival.

Purpose of the Study:

  • To investigate the sensitivity of Bcr-Abl transformed cells to ceramide-induced apoptosis.
  • To elucidate the signaling pathways involved in ceramide-induced apoptosis in CML cells, particularly the role of Bcr-Abl and PI3 kinase.

Main Methods:

  • Treatment of Bcr-Abl transformed cells (hematopoietic progenitors and cell lines) with ceramide analogues.
  • Assessment of apoptosis induction, including phosphatidyl-serine exposure.
  • Analysis of Bcr-Abl and PI3 kinase activation.
  • Investigation of Bcl2 protein modulation.

Main Results:

  • Bcr-Abl transformed cells remain sensitive to ceramide-induced apoptosis, with a faster response compared to normal cells.
  • Ceramide treatment rapidly activates Bcr-Abl and PI3 kinases in CML cells.
  • Bcr-Abl kinase activity is crucial for the accelerated ceramide response, and PI3 kinase partly mediates phosphatidyl-serine exposure.
  • Ceramide-induced apoptosis does not appear to involve Bcl2 protein modulation.

Conclusions:

  • Bcr-Abl fusion protein blocks one apoptotic pathway (cytokine-starving) but accelerates another initiated by ceramide.
  • Ceramide-induced apoptosis in CML cells involves rapid activation of Bcr-Abl and PI3 kinase signaling.
  • These findings suggest distinct signaling pathways for programmed cell death, with Bcr-Abl playing a dual role in CML apoptosis.

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