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Related Experiment Videos

Nitric oxide inhibits CPP32-like activity under redox regulation

T Ogura1, M Tatemichi, H Esumi

  • 1Investigative Treatment Division, National Cancer Center Research Institute East, Kashiwa, Chiba, Japan. togura@east.ncc.go.jp

Biochemical and Biophysical Research Communications
|July 18, 1997
PubMed
Summary

Nitric oxide (NO) inhibits CPP32-like proteases, key enzymes in apoptosis, by regulating their activity through redox mechanisms. This suggests NO may prevent programmed cell death by modulating the ICE protease cascade.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Pharmacology

Background:

  • CPP32-like proteases are crucial in apoptosis.
  • Nitric oxide (NO) plays a role in cellular signaling.
  • Vincristine is a chemotherapy agent that can induce apoptosis.

Purpose of the Study:

  • To investigate the in vitro inhibitory effect of nitric oxide (NO) on CPP32-like protease activity.
  • To explore the role of NO in regulating apoptosis via the ICE protease cascade.

Main Methods:

  • Enzymatic assays using cell extracts from vincristine-treated cells.
  • Inhibition studies with NO donor (NOR1) and recombinant CPP32beta.
  • Reversal experiments using glutathione.

Main Results:

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  • Nitric oxide (NO), generated from NOR1, inhibited CPP32-like protease activity in a dose-dependent manner.
  • Recombinant CPP32beta activity was also inhibited by NOR1.
  • Inhibition by NO was reversed by glutathione, indicating redox regulation.

Conclusions:

  • CPP32-like protease activity is regulated by NO through redox mechanisms.
  • NO may prevent apoptosis by inhibiting the ICE protease cascade, influenced by cellular redox status.