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The unpredictable caspase-2: what can it do?

Helin Vakifahmetoglu-Norberg1, Boris Zhivotovsky

  • 1Division of Toxicology, Institute of Environmental Medicine, Karolinska Institutet, SE-171 77 Stockholm, Sweden.

Trends in Cell Biology
|January 12, 2010
PubMed

Insights

Caspase-2, a key apoptosis regulator, has newly discovered roles in cell cycle and DNA repair, potentially acting as a tumor suppressor. PIDDosome complexes may control these diverse caspase-2 functions.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Caspase-2 is a highly conserved caspase family protein crucial for apoptosis regulation.
  • Its exact function has been debated due to a lack of clear phenotypes in knockout mice.
  • Recent studies highlight novel activation mechanisms and roles beyond apoptosis.

Purpose of the Study:

  • To explore the multifaceted roles of caspase-2.
  • To discuss the involvement of PIDDosome complexes in regulating caspase-2 functions.
  • To connect caspase-2 activity to p53 and non-apoptotic processes.

Main Methods:

  • Review of recent publications on caspase-2 activation and function.
  • Analysis of the role of the PIDDosome complex.
  • Integration of evidence for caspase-2 in apoptosis, cell cycle, and DNA repair.

Main Results:

  • Caspase-2 activation is regulated by complexes like the PIDDosome.
  • Caspase-2 links to p53, suggesting roles in DNA damage response.
  • Evidence supports caspase-2 involvement in cell cycle regulation and DNA repair.
  • A tumor-suppressor role for caspase-2 is increasingly suggested.

Conclusions:

  • PIDDosome complexes are central to switching between caspase-2's diverse functions.
  • Caspase-2 plays critical roles in both apoptotic and non-apoptotic cellular processes.
  • Understanding these mechanisms is key to elucidating caspase-2's tumor-suppressor potential.

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