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Long-term Live-cell Imaging to Assess Cell Fate in Response to Paclitaxel
08:29

Long-term Live-cell Imaging to Assess Cell Fate in Response to Paclitaxel

Published on: May 14, 2018

Paclitaxel-induced FasL-independent apoptosis and slow (non-apoptotic) cell death

Mikhail V Blagosklonny1, Robert Robey, M Saeed Sheikh

  • 1Medicine Branch, National Cancer Institute, NIH, Bethesda, Maryland 20892, USA. M_Blagosklonny@NYMC.Edu

Cancer Biology & Therapy
|August 13, 2002
PubMed

Insights

Paclitaxel (PTX) causes cell death, but its mechanism differs by cell type. PTX-induced apoptosis in Jurkat cells is FasL-independent, while MDA-MB-231 cells undergo slower, non-apoptotic death after mitotic arrest.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Pharmacology

Background:

  • Microtubule-active drugs like paclitaxel (PTX) induce mitotic arrest, potentially leading to apoptosis.
  • Previous studies suggested PTX mediates apoptosis via FasL upregulation in Jurkat and MDA-231 cells.

Purpose of the Study:

  • To investigate the role of FasL in paclitaxel-induced apoptosis in Jurkat and MDA-231 cells.
  • To elucidate the distinct mechanisms of cell death induced by PTX in different cell lines.

Main Methods:

  • Treatment of Jurkat and MDA-231 cells with paclitaxel (PTX) and anti-FasL antibodies.
  • Assessment of apoptosis induction, caspase activation (caspase-3, -8), and PARP cleavage.
  • Evaluation of cell fate following PTX-induced mitotic arrest, including multinucleation.

Main Results:

  • Anti-FasL antibodies did not inhibit PTX-induced apoptosis in Jurkat cells.
  • PTX did not induce apoptosis in MDA-231 cells; instead, it caused slow cell death without caspase activation or PARP cleavage.
  • Doxorubicin inhibited PTX-induced apoptosis in Jurkat cells but not FasL-induced apoptosis.
  • Jurkat cells underwent apoptosis after PTX-induced mitotic arrest, while MDA-MB-231 cells formed multinucleated cells and died via a non-apoptotic pathway.

Conclusions:

  • Paclitaxel-induced apoptosis in Jurkat cells is independent of the FasL pathway.
  • MDA-MB-231 cells exhibit a distinct, slower, non-apoptotic cell death mechanism following PTX-induced mitotic arrest.
  • Cellular response to paclitaxel varies, highlighting different cell death pathways activated by mitotic arrest.

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