Mercaptoethylguanidine and related compounds are scavengers of peroxynitrite

Csaba Szabo, G. Ferrer-Sueta, A. L. Salzman, R. Radi

Research output: Contribution to journalArticle

Abstract

Part of the nitric oxide (NO) related eytotoxicity is mediated by peroxynitrite, a toxic oxidant species produced from NO and superoxide. Inhibitors of iNOS and scavengers of peroxynitrite may be of therapeutic potential. Certain guanidines are inhibitors of the inducible isoform of NO synthase (iNOS), and have antiinflammatory effects. Here we demonstrate that MEG, and related guanidines. in addition to being inhibitors of iNOS, are scavengers of peroxynitrite. Peroxynitrile-induced oxidations were measured by fluorometric detection of peroxynitrite-induced oxidation of dihydrorhodamine 123 to rhodamine 123 by the spectrophotometric detection of peroxynitrite-induced oxidation of cytochrome C2+, and by the fluorometric detection of peroxynitrite-induced hydroxylation of benzoate. In the dihydrorhodamine assay, MEG inhibited peroxynitrite-induced oxidations with a potency comparable to that of glutathione and cysteine. Derivatives of MEG, such as selenoethylguanidine, N-methyl-MEG, N,N1-dimethyl-MEG, mercaptopropylguamdine, and guanidinoethyldisulfide (GED), as well as aminoguanidine inhibited the peroxy nitrite-induced oxidation of dihydrorhodamine 123, but with potencies lower than that of MEG. In the other assays used (benzoate and cytochrome C2+). MEG also exerted a potent inhibitory effect. Using stopped flow spectroscopy, we then determined that MEG reacts with peroxynitrite with a second order rate constant of 1900±64 M1 s-1, at 37 °C. In contrast to MEG, neither GED nor aminoguanidine accelerated the rate of peroxynitrite decomposition, indicating that they do not react in a second order process with peroxynitrite. We speculate that the antiinflammatory effect of MEG is due to a combined mode of action: iNOS inhibition and peroxynitrite scavenging.

Original languageEnglish (US)
JournalFASEB Journal
Volume11
Issue number3
StatePublished - 1997
Externally publishedYes

Fingerprint

Peroxynitrous Acid
oxidation
guanidines
benzoates
cytochromes
anti-inflammatory activity
nitric oxide
Nitric Oxide Synthase
Protein Isoforms
Cytochromes c2
Oxidation
Guanidines
hydroxylation
assays
Benzoates
nitric oxide synthase
oxidants
superoxide anion
nitrites
cysteine

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Cell Biology

Cite this

Szabo, C., Ferrer-Sueta, G., Salzman, A. L., & Radi, R. (1997). Mercaptoethylguanidine and related compounds are scavengers of peroxynitrite. FASEB Journal, 11(3).

Mercaptoethylguanidine and related compounds are scavengers of peroxynitrite. / Szabo, Csaba; Ferrer-Sueta, G.; Salzman, A. L.; Radi, R.

In: FASEB Journal, Vol. 11, No. 3, 1997.

Research output: Contribution to journalArticle

Szabo, C, Ferrer-Sueta, G, Salzman, AL & Radi, R 1997, 'Mercaptoethylguanidine and related compounds are scavengers of peroxynitrite', FASEB Journal, vol. 11, no. 3.
Szabo, Csaba ; Ferrer-Sueta, G. ; Salzman, A. L. ; Radi, R. / Mercaptoethylguanidine and related compounds are scavengers of peroxynitrite. In: FASEB Journal. 1997 ; Vol. 11, No. 3.
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