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Functional activation of Nedd2/ICH-1 (caspase-2) is an early process in apoptosis

N L Harvey1, A J Butt, S Kumar

  • 1Hanson Centre for Cancer Research, Institute of Medical and Veterinary Science, Rundle Mall, Adelaide, SA 5000, Australia.

The Journal of Biological Chemistry
|May 16, 1997
PubMed

Insights

Nedd2 (caspase-2) is activated early during apoptosis, preceding caspase-3 activation. This suggests Nedd2 is an early effector in programmed cell death pathways.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Caspases are key proteases in apoptosis execution.
  • Caspases are synthesized as inactive precursors requiring cleavage for activation.
  • Some caspases activate during apoptosis.

Purpose of the Study:

  • To investigate the activation of Nedd2/ICH-1 (caspase-2) during apoptosis.
  • To determine the timing of Nedd2 activation relative to other caspases.

Main Methods:

  • Induction of apoptosis using various stimuli.
  • Monitoring caspase activation.
  • Comparing Nedd2 activation with CPP32 (caspase-3) activation.

Main Results:

  • Nedd2 (caspase-2) activation was observed during apoptosis induced by diverse stimuli.
  • Nedd2 activation occurred early, preceding CPP32 (caspase-3) activation.
  • Nedd2 activation was absent in apoptosis-resistant cells.

Conclusions:

  • Nedd2 (caspase-2) functions as an early effector in the apoptosis pathway.
  • Long prodomain caspases, like Nedd2, may activate upstream of short prodomain caspases, such as CPP32.

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