A novel procedure for generating both nitric oxide and superoxide in situ from chemical sources at any chosen mole ratio. First application: Tyrosine oxidation and a comparison with preformed peroxynitrite

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DOIResolve DOI: http://doi.org/10.1021/tx0001272
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TypeArticle
Journal titleChemical Research in Toxicology
ISSN0893-228X
Volume13
Issue12
Pages12871293; # of pages: 7
Subjectfree radical; nitric oxide; peroxynitrite; superoxide; tyrosine derivative; article; chemical reaction kinetics; oxidation; reaction analysis; synthesis; Molsidomine; Nitrates; Nitric Oxide; Nitric Oxide Donors; Nitrogen Oxides; Oxidants; Oxidation-Reduction; Spermine; Superoxides; Tyrosine
AbstractThe first method for generating ·NO and O2·- at any known, constant ratio has been developed. Spermine NONOate and di(4-carboxybenzyl)hyponitrite decay with first-order kinetics and exactly equal rate constants (half-lives of 80 min) at 37 °C and pH 7.5 to give 200 and 40 mol % ·NO and O2·- respectively. Tyrosine oxidation to dityrosine and 3-nitrotyrosine (the major and minor products under the conditions used in these experiments) has been studied (mainly in the presence of CO2) using various different ratios of the rates of formation of ·NO and O2·-. The ·NO/O2·- = 1.0 product profiles are very similar to those of the products derived from equal amounts of ·NO and O2·- generated at a ·NO/O2·- ratio of 1.0 from SIN-1 but are very different from those derived from preformed peroxynitrite. All the experimental results can be explained in terms of free radical chemistry. The product profiles at all the ·NO/O2·- ratios could be satisfactorily simulated provided an important group of reactions which lead to the consumption of dityrosine was included.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21276745
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Record identifier7d75aad7-7883-4557-a26c-2c201260f8b8
Record created2015-10-13
Record modified2016-05-09
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