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• W2002337209 abstract "Aromatic amine drugs have been associated with agranulocytosis (neutrophil depletion) for which the mechanism is unknown. We have previously shown that the metabolism of two aromatic amine drugs by human myeloperoxidase (MPO) results in phenyl radical metabolite formation and also in protein free radical formation on MPO. Because the concentration of drug required to produce a maximum signal for MPO protein free radical (MPO•) detection was different for each drug, this prompted us to consider that other aromatic amines may also show varying degrees of ability to induce MPO• formation. Immunoassay experiments using the immuno-spin-trapping technique were performed, which evaluated the potency of different aromatic amines containing the aniline substructure to generate the MPO•. Each reaction contained equal amounts of H2O2, 5,5-dimethyl-1-pyrroline-N-oxide, MPO, and variable concentrations of aniline derivatives. Several physicochemical parameters for aniline derivatives were used to derive quantitative structure−activity relationship equations, which showed that the Hammett constant (σ) best correlated with the MPO• formation for all aniline derivatives. More statistically robust equations were derived if the anilines were separated into mono- and disubstituted groups. However, some aniline derivatives did not induce MPO• formation. Using electron spin resonance spectroscopy, we evaluated the ability of all aniline derivatives tested to produce phenyl radical metabolites, as previously shown by spin trapping for the aromatic amine drugs. Interestingly, we found that only those aniline derivatives that produced a phenyl radical also formed MPO•. We propose that the phenyl radical is the reactive free radical metabolite responsible for generating the MPO•." @default.
• W2002337209 created "2016-06-24" @default.
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• W2002337209 date "2010-03-03" @default.
• W2002337209 modified "2023-09-23" @default.
• W2002337209 title "Investigating the Mechanisms of Aromatic Amine-Induced Protein Free Radical Formation by Quantitative Structure−Activity Relationships: Implications for Drug-Induced Agranulocytosis" @default.
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• W2002337209 doi "https://doi.org/10.1021/tx900432d" @default.
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