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Delaying mitotic exit downregulates FLIP expression and strongly sensitizes tumor cells to TRAIL

T Sánchez-Pérez1, R H Medema2, A López-Rivas3

  • 11] Centro Andaluz de Biología Molecular y Medicina Regenerativa (CABIMER), Consejo Superior de Investigaciones Científicas, Sevilla, Spain [2] Division of cell Biology, The Netherlands Cancer Institute, Amsterdam, The Netherlands.

Oncogene
|February 4, 2014
PubMed

Insights

Targeting mitotic exit by downregulating FLICE-like inhibitory protein (FLIP) sensitizes tumor cells to TRAIL-induced apoptosis. Combining antimitotic drugs with TRAIL may prevent resistance and enhance tumor suppression.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Current antitumor therapies often target the cell cycle, particularly mitosis, leading to cell death.
  • Mitotic slippage is a key resistance mechanism against antimitotic drugs, limiting their efficacy.
  • Targeting mitotic exit is a promising strategy to overcome drug resistance and improve tumor cell killing.

Purpose of the Study:

  • To investigate the role of FLICE-like inhibitory protein (FLIP) in tumor cell response to antimitotic treatments.
  • To explore the potential of combining antimitotic drugs with TRAIL (tumor necrosis factor-related apoptosis-inducing ligand) to enhance apoptosis and overcome resistance.

Main Methods:

  • Induction of mitotic checkpoint activation and mitotic arrest in various tumor cell lines.
  • Assessment of FLIP protein levels following antimitotic treatments.
  • Evaluation of tumor cell sensitivity to TRAIL-induced apoptosis.
  • Experimental manipulation of Cdc20 and cyclin B to induce mitotic arrest independent of checkpoint activation.

Main Results:

  • Treatments causing mitotic arrest downregulated FLIP levels and sensitized cells to TRAIL-induced apoptosis.
  • Mitotic arrest, even without checkpoint activation (via Cdc20 knockdown or nondegradable cyclin B), also led to FLIP downregulation and TRAIL sensitivity.
  • These findings indicate a conserved mechanism linking mitotic arrest to apoptosis sensitization.

Conclusions:

  • Downregulation of FLIP during mitotic arrest is a critical step sensitizing tumor cells to TRAIL.
  • Combining antimitotic drugs that target cyclin B degradation with TRAIL may prevent mitotic slippage.
  • This combination strategy holds potential for enhanced tumor suppression by facilitating apoptosis induction.

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