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The mechanism(s) of nitrite\u2010mediated neuroprotection remain to be defined. We hypothesized that nitrite\u2010mediated brain mitochondrial S\u2010nitrosation accounts for neuroprotection by reducing reperfusion reactive oxygen species (<jats:styled-content style=\"fixed-case\">ROS<\/jats:styled-content>) generation. Nitrite (4\u00a0\u03bcmol) or placebo was infused <jats:styled-content style=\"fixed-case\">IV<\/jats:styled-content> after normothermic (37\u00b0C) <jats:styled-content style=\"fixed-case\">ACA<\/jats:styled-content> in randomized, blinded fashion with evaluation of neurologic function, survival, brain mitochondrial function, and <jats:styled-content style=\"fixed-case\">ROS<\/jats:styled-content>. Blood and <jats:styled-content style=\"fixed-case\">CSF<\/jats:styled-content> nitrite were quantified using reductive chemiluminescence and S\u2010nitrosation by biotin switch. Direct neuroprotection was verified <jats:italic>in\u00a0vitro<\/jats:italic> after 1 and 4\u00a0h neuronal oxygen glucose deprivation measuring neuronal death with inhibition studies to examine mechanism. Mitochondrial <jats:styled-content style=\"fixed-case\">ROS<\/jats:styled-content> generation was quantified by live neuronal imaging using mito<jats:styled-content style=\"fixed-case\">SOX<\/jats:styled-content>. Nitrite significantly reduced neurologic disability after <jats:styled-content style=\"fixed-case\">ACA<\/jats:styled-content>. <jats:styled-content style=\"fixed-case\">ROS<\/jats:styled-content> generation was reduced in brain mitochondria from nitrite\u2010 versus placebo\u2010treated rats after <jats:styled-content style=\"fixed-case\">ACA<\/jats:styled-content> with congruent preservation of brain ascorbate and reduction of <jats:styled-content style=\"fixed-case\">ROS<\/jats:styled-content> in brain sections using immuno\u2010spin trapping. <jats:styled-content style=\"fixed-case\">ATP<\/jats:styled-content> generation was maintained with nitrite up to 24\u00a0h after <jats:styled-content style=\"fixed-case\">ACA<\/jats:styled-content>. Nitrite rapidly entered <jats:styled-content style=\"fixed-case\">CSF<\/jats:styled-content> and increased brain mitochondrial S\u2010nitrosation. Nitrite reduced <jats:italic>in\u00a0vitro<\/jats:italic> mitochondrial superoxide generation and improved survival of neurons after oxygen glucose deprivation. Protection was maintained with inhibition of soluble guanylate cyclase but lost with <jats:styled-content style=\"fixed-case\">NO<\/jats:styled-content> scavenging and ultraviolet irradiation. Nitrite therapy results in direct neuroprotection from <jats:styled-content style=\"fixed-case\">ACA<\/jats:styled-content> mediated by reductions in brain mitochondrial <jats:styled-content style=\"fixed-case\">ROS<\/jats:styled-content> in association with protein S\u2010nitrosation. Neuroprotection is dependent on <jats:styled-content style=\"fixed-case\">NO<\/jats:styled-content> and <jats:italic>S<\/jats:italic>\u2010nitrosothiol generation, not soluble guanylate cyclase.<\/jats:p><\/jats:sec><jats:sec><jats:label\/><jats:p>\n<jats:boxed-text content-type=\"graphic\" position=\"anchor\"><jats:graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mimetype=\"image\/png\" position=\"anchor\" specific-use=\"enlarged-web-image\" xlink:href=\"graphic\/jnc13764-fig-0006-m.png\"><jats:alt-text>image<\/jats:alt-text><\/jats:graphic><\/jats:boxed-text>\n<\/jats:p><\/jats:sec>","DOI":"10.1111\/jnc.13764","type":"journal-article","created":{"date-parts":[[2016,8,10]],"date-time":"2016-08-10T09:01:39Z","timestamp":1470819699000},"page":"419-431","source":"Crossref","is-referenced-by-count":39,"title":["Mechanistic characterization of nitrite\u2010mediated neuroprotection after experimental cardiac arrest"],"prefix":"10.1111","volume":"139","author":[{"given":"Cameron","family":"Dezfulian","sequence":"first","affiliation":[{"name":"Safar Center for Resuscitation Research University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"},{"name":"Department of Critical Care Medicine University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"},{"name":"Vascular Medicine Institute University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elizabeth","family":"Kenny","sequence":"additional","affiliation":[{"name":"Safar Center for Resuscitation Research University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrew","family":"Lamade","sequence":"additional","affiliation":[{"name":"Safar Center for Resuscitation Research University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amalea","family":"Misse","sequence":"additional","affiliation":[{"name":"Safar Center for Resuscitation Research University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"},{"name":"Department of Critical Care Medicine University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicholas","family":"Krehel","sequence":"additional","affiliation":[{"name":"Safar Center for Resuscitation Research University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claudette","family":"St. Croix","sequence":"additional","affiliation":[{"name":"Department of Cell Biology University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eric E.","family":"Kelley","sequence":"additional","affiliation":[{"name":"Department of Pharmacology and Chemical Biology University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Travis C.","family":"Jackson","sequence":"additional","affiliation":[{"name":"Safar Center for Resuscitation Research University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"},{"name":"Department of Critical Care Medicine University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"Uray","sequence":"additional","affiliation":[{"name":"Safar Center for Resuscitation Research University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Justin","family":"Rackley","sequence":"additional","affiliation":[{"name":"Safar Center for Resuscitation Research University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick M.","family":"Kochanek","sequence":"additional","affiliation":[{"name":"Safar Center for Resuscitation Research University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"},{"name":"Department of Critical Care Medicine University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert S. 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