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pubmed-article:11118341pubmed:abstractTextIn the presence of hydrogen peroxide, horseradish peroxidase (HRP) catalyzes the production of N(1)-acetyl-N(2)-formyl-5-methoxykynuramine from melatonin. This reaction consumes oxygen and exhibits chemiluminescence in the 440-540 nm region. The excited cleavage product derived from the thermolysis of an intermediate dioxetane is suggested to be the emitting species. Chemiluminescence and the indole ring cleavage product were also observed when HRP/H(2)O(2) was replaced by phorbol myristate acetate or opsonized zymosan-activated neutrophils. Azide, a myeloperoxidase inhibitor, strongly suppressed melatonin oxidation. Superoxide dismutase has a strong inhibitory effect on light emission but catalase and uric acid are without effect on the emission. The oxidation of melatonin by activated neutrophils may be relevant to the in vivo functions of myeloperoxidase and melatonin. The possible biological implication of melatonin oxidation by neutrophils, especially in inflammatory conditions, is discussed.lld:pubmed
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pubmed-article:11118341pubmed:copyrightInfoCopyright 2000 Academic Press.lld:pubmed
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pubmed-article:11118341pubmed:dateRevised2011-11-17lld:pubmed
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pubmed-article:11118341pubmed:articleTitleMyeloperoxidase-catalyzed oxidation of melatonin by activated neutrophils.lld:pubmed
pubmed-article:11118341pubmed:affiliationDepartamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, São Paulo, CEP 05508-900, Brazil.lld:pubmed
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