Linked Life Data

9269581

Source:http://linkedlifedata.com/resource/pubmed/id/9269581

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1997-10-6
pubmed:abstractText
Salicylate hydroxylation has often been used as an assay of hydroxyl radical production in vivo. We have examined here if hydroxylation of salicylate might also occur by its reaction with peroxynitrite. To test this hypothesis, we exposed salicylate to various concentrations of peroxynitrite, in vitro. We observed the hydroxylation of salicylate at 37 degrees C by peroxynitrite at pH 6, 7 and 7.5, where the primary products had similar retention times on HPLC to 2,3- and 2,5-dihydroxybenzoic acid. The product yields were pH dependent with maximal amounts formed at pH 6. Furthermore, the relative concentration of 2,3- to 2,5-dihydroxybenzoic acid increased with decreasing pH. Nitration of salicylate was also observed and both nitration and hydroxylation reaction products were confirmed independently by mass spectrometry. The spin trap N-t-butyl-alpha-phenylnitrone (PBN), with or without dimethyl sulfoxide (DMSO), was incapable of trapping the peroxynitrite decomposition intermediates. Moreover, free radical adducts of the type PBN/.CH3 and PBN/.OH were susceptible to destruction by peroxynitrite (pH 7, 0.1 M phosphate buffer). These results suggest direct peroxynitrite hydroxylation of salicylate and that the presence of hydroxyl radicals is not a prerequisite for hydroxylation reactions.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
1071-5762
pubmed:author
pubmed:issnType
Print
pubmed:volume
27
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
63-72
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Biological reactions of peroxynitrite: evidence for an alternative pathway of salicylate hydroxylation.
pubmed:affiliation
Biophysics Program, Ohio State University, Columbus 43210, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't