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pubmed-article:10730825pubmed:abstractTextSince an increased endothelial superoxide formation plays an important role in the pathogenesis of endothelial dysfunction its specific detection is of particular interest. The widely used superoxide probe lucigenin, however, has been reported to induce superoxide under certain conditions, especially in the presence of NADH. This raises questions as to the conclusion of a NAD(P)H oxidase as the major source of endothelial superoxide. Using independent methods, we showed that lucigenin in the presence of NADH leads to the production of substantial amount of superoxide (approximately 15-fold of control) in endothelial cell homogenates. On the other hand, these independent methods revealed that endothelial cells without lucigenin still produce superoxide in a NAD(P)H-dependent manner. This was blocked by inhibitors of the neutrophil NADPH oxidase diphenyleniodonium and phenylarsine oxide. Our results demonstrate that a NAD(P)H-dependent oxidase is an important source for endothelial superoxide but the latter, however, cannot be measured reliably by lucigenin.lld:pubmed
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pubmed-article:10730825pubmed:articleTitlePitfalls of using lucigenin in endothelial cells: implications for NAD(P)H dependent superoxide formation.lld:pubmed
pubmed-article:10730825pubmed:affiliationInstitute of Physiology, Ludwig Maximilians University Munich, Germany. sohn@lrz.uni-muenchen.delld:pubmed
pubmed-article:10730825pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10730825pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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