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The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
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The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
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Bcl-xL controls a switch between cell death modes during mitotic arrest.

N Bah1, L Maillet1, J Ryan2

  • 1Team 8 'Cell survival and Tumor Escape in Breast Cancer', UMR 892 INSERM/6299 CNRS/Université de Nantes, Institut de Recherche en Santé de l'Université de Nantes, 8 quai Moncousu, BP 70721, Nantes 1 44007, France.

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Summary
This summary is machine-generated.

Targeting Bcl-xL enhances cancer cell death during mitotic arrest caused by antimitotic drugs. This strategy, by modulating Bcl-xL phosphorylation, promotes apoptosis and improves therapeutic efficacy.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Antimitotic agents induce prolonged mitotic arrest, relying on the spindle assembly checkpoint.
  • The precise mechanisms of cell death following mitotic arrest are not fully understood.
  • Anti-apoptotic Bcl-2 family members play a role in cancer cell survival during mitotic arrest.

Purpose of the Study:

  • Investigate the role of anti-apoptotic Bcl-2 family members in the fate of mitotically arrested cancer cells.
  • Determine if targeting Bcl-xL can enhance cell death induced by antimitotic agents.
  • Elucidate the role of Bcl-xL phosphorylation in regulating cell death during mitotic arrest.

Main Methods:

  • Treatment of mammary tumor cells with paclitaxel or Cdc20 depletion to induce mitotic arrest.
  • BH3 profiling assays to assess apoptotic priming.
  • Depletion or inhibition of Bcl-xL using siRNA or ABT-737.
  • Analysis of caspase and Bax/Bak-dependent apoptosis.
  • Site-directed mutagenesis of Bcl-xL (S62D and S62A mutants).

Main Results:

  • Mitotic arrest alone resulted in weak, delayed, caspase- and Bax/Bak-independent cell death.
  • Viable cells in mitotic arrest were primed for apoptosis, with Bcl-xL maintaining mitochondrial integrity.
  • Bcl-xL depletion or ABT-737 treatment during mitotic arrest induced efficient, caspase- and Bax-dependent apoptosis.
  • Phosphorylation of Bcl-xL at serine 62 modulated its interaction with Bax and sensitivity to ABT-737.
  • The S62D-Bcl-xL mutant was less effective at sequestering Bax and protecting cells from death compared to the S62A mutant.

Conclusions:

  • Bcl-xL is crucial for maintaining cancer cell survival during antimitotic drug-induced mitotic arrest.
  • Targeting Bcl-xL, particularly with inhibitors like ABT-737, can convert weak mitotic cell death into potent apoptosis.
  • Bcl-xL phosphorylation at S62 influences its pro-apoptotic function and response to inhibitors.
  • Combining Bcl-xL targeting with antimitotic agents offers a promising strategy to enhance cancer therapy efficacy.