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Related Experiment Videos

Pleiotropic cell-division defects and apoptosis induced by interference with survivin function.

F Li1, E J Ackermann, C F Bennett

  • 1Boyer Center for Molecular Medicine, Department of Pathology, Yale University School of Medicine, 295 Congress Avenue, New Haven, Connecticut 06536, USA.

Nature Cell Biology
|December 10, 1999
PubMed
Summary

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Survivin controls apoptosis and preserves p21 integrity within centrosomes, ensuring normal cell division. Disrupting survivin leads to cell death and defects like polyploidy.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Apoptosis, or programmed cell death, is crucial for normal development and tissue homeostasis.
  • Survivin is an apoptosis inhibitor that plays a role in cell division and cancer progression.

Purpose of the Study:

  • To investigate the role of survivin in regulating apoptosis during normal cell division.
  • To elucidate the molecular mechanisms by which survivin controls mitotic progression and prevents polyploidy.

Main Methods:

  • Utilized dominant-negative survivin mutants and antisense survivin complementary DNA to interfere with survivin function.
  • Investigated the impact of survivin disruption on cell cycle progression, centrosome integrity, and caspase activity.
  • Assessed the role of p21Waf1/Cip1 in survivin-mediated regulation of polyploidy.

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Main Results:

  • Interference with survivin caused caspase-dependent cell death in the G2/M phase.
  • Survivin disruption led to centrosome dysregulation, multipolar spindles, and multinucleated, polyploid cells.
  • Survivin antagonists disrupted a centrosomal complex of survivin, caspase-3, and p21Waf1/Cip1, causing p21 cleavage. Polyploidy was exacerbated in p21-deficient cells.

Conclusions:

  • Survivin is essential for controlling apoptosis and maintaining p21 integrity within centrosomes.
  • Survivin's function is required for normal mitotic progression and prevention of polyploidy.
  • Targeting survivin may offer therapeutic strategies for cancer by inducing cell death and mitotic defects.