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Mitigation of NADPH Oxidase 2 Activity as a Strategy to Inhibit Peroxynitrite Formation

Abstract : Using a high-throughput screening (HTS)-compatible assays for superoxide and hydrogen peroxide, we identified potential inhibitors of NADPH oxidase (Nox2) isoform from a small library of bioactive compounds. By using multiple probes (hydroethidine, hydropropidine, Amplex Red, and coumarin boronate) with well-defined redox chemistry that form highly diagnostic marker products upon reaction with superoxide (O 2 • –), hydrogen peroxide (H 2 O 2), and peroxynitrite (ONOO –), the number of false positives was greatly decreased. Selected hits for Nox2 were further screened for their ability to inhibit ONOO – formation in activated macrophages. New diagnostic marker product for ONOO – is reported. We conclude that the newly developed HTS/ROS assays could also be used to identify potential inhibitors of ONOO – formed from Nox2-derived O 2 • – and nitric oxide synthase (NOS)-derived nitric oxide.
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Submitted on : Monday, November 28, 2016 - 2:01:10 PM
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Jacek Zielonka, Monika Zielonka, Lynn Verplank, Gang Cheng, Micael Hardy, et al.. Mitigation of NADPH Oxidase 2 Activity as a Strategy to Inhibit Peroxynitrite Formation. Journal of Biological Chemistry, American Society for Biochemistry and Molecular Biology, 2016, 291, pp.7029-7044. ⟨10.1074/jbc.M115.702787⟩. ⟨hal-01400640⟩

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