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Sustained activation of p34(cdc2) is required for noscapine-induced apoptosis

K Ye1, J Zhou, J W Landen

  • 1Department of Cell Biology, Emory University School of Medicine, 1648 Pierce Dr., Atlanta, GA 30322, USA.

The Journal of Biological Chemistry
|October 27, 2001
PubMed

Insights

Noscapine, an anti-microtubule drug, triggers cell death. This study reveals that sustained p34(cdc2) kinase activation during mitotic arrest is crucial for noscapine-induced apoptosis, linking these two cellular events.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Anti-microtubule agents cause mitotic arrest and apoptosis.
  • The relationship and molecular mechanisms linking these events are not fully understood.
  • Evidence suggests anti-microtubule agents may induce apoptosis through mitosis-independent pathways.

Purpose of the Study:

  • To investigate the role of p34(cdc2) kinase in noscapine-induced apoptosis.
  • To establish a link between mitotic arrest and apoptosis mediated by anti-microtubule drugs.
  • To elucidate the molecular mechanisms underlying noscapine's effects on cell death.

Main Methods:

  • Utilized FM3A murine mammary carcinoma cells and a p34(cdc2) deficient mutant cell line (FT210).
  • Inhibited p34(cdc2) activity using olomoucine.
  • Restored p34(cdc2) function in mutant cells via transfection with wild-type p34(cdc2).

Main Results:

  • Apoptosis induced by noscapine was blocked by inhibiting p34(cdc2) activity with olomoucine.
  • Reducing p34(cdc2) level and activity in FT210 cells also blocked noscapine-induced apoptosis.
  • Restoring wild-type p34(cdc2) in FT210 cells re-established sensitivity to noscapine-induced mitotic arrest and apoptosis.

Conclusions:

  • Sustained activation of p34(cdc2) kinase during mitotic arrest is essential for noscapine-induced apoptosis.
  • This study establishes a direct link between mitotic arrest and apoptosis mediated by noscapine.
  • p34(cdc2) activation is a critical molecular event connecting anti-microtubule drug-induced mitotic arrest to subsequent cell death.

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