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Related Experiment Videos

Hydroxyguanidines inhibit peroxynitrite-induced oxidation

G J Southan1, A L Salzman, C Szabó

  • 1Intramural Research Support Program, SAIC-Frederick, National Cancer Institute-Frederick Cancer Research and Development Center, MD, USA. gjsouthan@aol.com

Free Radical Biology & Medicine
|December 5, 1998
PubMed
Summary

Hydroxyguanidines (OHGs) effectively scavenge peroxynitrite (PN), protecting cells from oxidative damage. These compounds show promise as antioxidants, potentially outperforming endogenous ones like glutathione and cysteine.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Oxidative Stress Research

Background:

  • Hydroxyguanidines (OHGs), including NG-hydroxy-L-arginine (OH-arg), interact with nitric oxide (NO) and nitrogen oxides (NOx).
  • Peroxynitrite (PN) is a reactive nitrogen species implicated in cellular oxidative damage.

Purpose of the Study:

  • To investigate the ability of OHGs and related compounds to scavenge peroxynitrite (PN).
  • To evaluate the protective effects of OHGs against PN-induced oxidative stress in cellular models.

Main Methods:

  • In vitro assays measuring the inhibition of dihydrorhodamine (DHR) oxidation by PN.
  • Assessment of protection against PN-induced mitochondrial respiration suppression and protein oxidation in J774 macrophages.
  • Chemical analysis of reaction products between a substituted-phenyl OHG and PN.

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Main Results:

  • N-substituted OHGs dose-dependently inhibited PN-induced DHR oxidation, showing efficacy comparable to or better than glutathione and cysteine.
  • OHGs minimally affected PN-induced benzoate hydroxylation, suggesting they do not react with the activated isomer of peroxynitrous acid.
  • Substituted-phenyl OHGs provided significant protection against PN-induced cellular damage in macrophages, while aminoguanidines offered moderate protection.

Conclusions:

  • Hydroxyguanidines effectively react with peroxynitrite, mitigating PN-mediated cellular injury.
  • OHGs demonstrate potential as superior endogenous antioxidants compared to cysteine and glutathione.
  • The findings highlight OHGs as promising therapeutic agents for conditions involving oxidative stress.