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Related Experiment Videos

Nitric oxide-donor compounds inhibit lipoxygenase activity

M Maccarrone1, M T Corasaniti, P Guerrieri

  • 1Department of Experimental Medicine and Biochemical Sciences, University of Rome Tor Vergata, Italy.

Biochemical and Biophysical Research Communications
|February 6, 1996
PubMed
Summary

Nitric oxide (NO)-releasing agents inhibit lipoxygenase activity, a key enzyme in arachidonic acid metabolism. This inactivation by NO donors suggests a novel mechanism for NO

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Lipoxygenase (LOX) is crucial for arachidonic acid metabolism.
  • Nitric oxide (NO) plays diverse biological roles.
  • NO-releasing agents can influence cellular processes.

Purpose of the Study:

  • To investigate the effect of NO-releasing agents on lipoxygenase activity.
  • To elucidate the mechanism of NO-mediated lipoxygenase inhibition.

Main Methods:

  • Utilized soybean lipoxygenase type II (LOX-2) as a model enzyme.
  • Assessed the inhibitory effects of sodium nitroprusside (SNP) and S-nitroso-N-acetylpenicillamine (SNAP).
  • Determined inhibition constants and evaluated effects on enzyme activation and redox state.

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Main Results:

  • SNP and SNAP acted as competitive inhibitors of LOX-2.
  • Both agents inactivated LOX-2 by reducing catalytic iron to the Fe(II) state.
  • NO donors inhibited H2O2-mediated activation and co-oxidative/per-oxidative activities of LOX-2.

Conclusions:

  • NO-releasing agents inhibit lipoxygenase dioxygenase activity.
  • NO may exert biological effects partly through lipoxygenase inactivation.
  • This highlights a potential role of NO in regulating arachidonic acid metabolism.