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Caspase-2-mediated cell death is required for deleting aneuploid cells

S Dawar1, Y Lim1, J Puccini1,2

  • 1Centre for Cancer Biology, University of South Australia, Adelaide, SA, Australia.

Oncogene
|December 20, 2016
PubMed

Insights

Caspase-2 is crucial for deleting cells with abnormal mitosis, preventing chromosomal instability and aneuploidy. Its apoptotic activity is essential for maintaining genomic stability and tumor suppression.

Area of Science:

  • Cell Biology
  • Genetics
  • Cancer Research

Background:

  • Caspase-2 is an evolutionarily conserved caspase involved in chromosomal stability and tumor suppression.
  • Caspase-2 deficient mice exhibit premature aging, increased tumor development, and aneuploidy under stress.
  • The precise role of caspase-2 in preventing chromosomal instability requires further elucidation.

Purpose of the Study:

  • To investigate the mechanism by which caspase-2 protects against chromosomal instability.
  • To determine if caspase-2 is required for the elimination of mitotically aberrant cells.
  • To assess the necessity of caspase-2's catalytic activity in preventing aneuploidy.

Main Methods:

  • Utilized an ex vivo system with primary splenocytes from Caspase-2 deficient (Casp2-/-) mice.
  • Exposed cells to anti-mitotic drugs and employed live cell imaging to monitor mitosis.
  • Generated Casp2C320S mutant mice to assess catalytic activity's role.

Main Results:

  • Caspase-2 deficiency leads to the accumulation of mitotically aberrant cells.
  • Caspase-2 is essential for the deletion of cells exhibiting mitotic aberrations.
  • The catalytic activity of caspase-2 is indispensable for its function in limiting aneuploidy.
  • Silencing caspase-2 in human cells confirmed its role in preventing aneuploidy.

Conclusions:

  • Caspase-2's apoptotic activity is vital for removing cells with mitotic errors.
  • This function of caspase-2 is critical for maintaining chromosomal stability and preventing aneuploidy.
  • Caspase-2 acts as a safeguard against genomic instability and potentially tumor development.

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