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Analysis of Cell Cycle Position in Mammalian Cells
12:19

Analysis of Cell Cycle Position in Mammalian Cells

Published on: January 21, 2012

Measurement of changes in apoptosis and cell cycle regulatory kinase Cdk2

Gabriel Gil-Gómez1

  • 1Institut Municipal d'Investigació Mèdica i Universitat Pompeu Fabra, Barcelona, Spain.

Methods in Molecular Biology (Clifton, N.J.)
|April 24, 2004
PubMed

Insights

Cyclin-dependent kinase 2 (Cdk2) activation is crucial for the apoptosis of quiescent cells, but this process is stimulus-specific. Apoptotic Cdk2 activation is regulated by key proteins and involves the degradation of its inhibitors.

Area of Science:

  • Cell biology
  • Molecular biology
  • Biochemistry

Background:

  • Cell cycle regulatory proteins play a role in cell death.
  • Cyclin-dependent kinase 2 (Cdk2) activation is implicated in apoptosis.
  • The precise role of Cdk2 in apoptosis of quiescent cells requires further elucidation.

Purpose of the Study:

  • To investigate the role of Cdk2 activation in the apoptosis of quiescent cells.
  • To determine the stimulus-specificity of Cdk2 activation during apoptosis.
  • To identify regulatory mechanisms controlling apoptotic Cdk2 activation.

Main Methods:

  • Analysis of Cdk2 activity in quiescent cells undergoing apoptosis.
  • Stimulus-specific induction of apoptosis using glucocorticoids, DNA damage, and CD95.
  • Assessment of apoptosis regulatory proteins, including p53 and Bcl2 family members.
  • Measurement of Cdk2 inhibitor (p21Cip1, p27Kip1) degradation by caspases.

Main Results:

  • Cdk2 activation is necessary for the apoptosis of quiescent cells like thymocytes, neurons, and endothelial cells.
  • Apoptotic Cdk2 activation is stimulus-dependent, occurring in response to glucocorticoids and DNA damage but not CD95.
  • Apoptotic Cdk2 activation is modulated by p53 and Bcl2 family proteins.
  • Caspase-mediated degradation of p21Cip1 and p27Kip1 correlates with Cdk2 activation.

Conclusions:

  • Cdk2 activation is a critical and stimulus-specific event in quiescent cell apoptosis.
  • The regulation of apoptotic Cdk2 activation involves complex interactions with other apoptosis-related proteins.
  • Methods for measuring Cdk2 activity changes in apoptotic quiescent cells are presented.

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