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Stimulation of thromboxane\/prostaglandin receptors (TP<\/jats:styled-content>) attenuates endothelium\u2010derived hyperpolarization (EDH<\/jats:styled-content>). We investigated whether EDH<\/jats:styled-content>\u2010type middle cerebral artery (MCA<\/jats:styled-content>) relaxations following TP<\/jats:styled-content> stimulation are altered after I\/R and the influence of peroxynitrite.<\/jats:p><\/jats:sec>Methods<\/jats:title>Vascular function was determined by wire myography after TP<\/jats:styled-content> stimulation with the thromboxane A2<\/jats:sub> mimetic 9,11\u2010dideoxy\u20109\u03b1, 11\u03b1 \u2010methano\u2010epoxy prostaglandin F2\u03b1 (U46619) in MCA<\/jats:styled-content> of Sprague Dawley rats subjected to MCA<\/jats:styled-content> occlusion (90\u00a0min)\/reperfusion (24\u00a0h) or sham operation, and in non\u2010operated (control) rats. Some rats were treated with saline or the peroxynitrite decomposition catalyst 5,10,15,20\u2010tetrakis(4\u2010sulfonatophenyl)porphyrinato iron (III<\/jats:styled-content>) (20\u00a0mg\u00a0kg\u22121<\/jats:sup>). Protein expression was evaluated in MCA<\/jats:styled-content> and in human microvascular endothelial cells submitted to hypoxia (overnight)\/reoxygenation (24\u00a0h) (H\/R) using immunofluorescence and immunoblotting.<\/jats:p><\/jats:sec>Results<\/jats:title>In U46619\u2010pre\u2010constricted MCA<\/jats:styled-content>, EDH<\/jats:styled-content>\u2010type relaxation by the proteinase\u2010activated receptor 2 agonist serine\u2013leucine\u2013isoleucine\u2013glycine\u2013arginine\u2013leucine\u2013NH<\/jats:styled-content>2<\/jats:sub> (SLIGRL<\/jats:styled-content>) was greater in I\/R than sham rats due to an increased contribution of small\u2010conductance calcium\u2010activated potassium channels (SKC<\/jats:sub><\/jats:styled-content>a<\/jats:sub>), which was confirmed by the enlarged relaxation to the SKC<\/jats:sub><\/jats:styled-content>a<\/jats:sub> activator N\u2010cyclohexyl\u2010N\u20102\u2010(3,5\u2010dimethyl\u2010pyrazol\u20101\u2010yl)\u20106\u2010methyl\u20104\u2010pyrimidinamine. I\/R and H\/R induced endothelial protein tyrosine nitration and filamentous\u2010actin disruption. In control MCA<\/jats:styled-content>, either cytochalasin D or peroxynitrite disrupted endothelial filamentous\u2010actin and augmented EDH<\/jats:styled-content>\u2010type relaxation. Furthermore, peroxynitrite decomposition during I\/R prevented the increase in EDH<\/jats:styled-content>\u2010type responses.<\/jats:p><\/jats:sec>Conclusion<\/jats:title>Following TP<\/jats:styled-content> stimulation in MCA<\/jats:styled-content>, EDH<\/jats:styled-content>\u2010type relaxation to SLIGRL<\/jats:styled-content> is greater after I\/R due to endothelial filamentous\u2010actin disruption by peroxynitrite, which prevents TP<\/jats:styled-content>\u2010induced block of SKC<\/jats:sub><\/jats:styled-content>a<\/jats:sub> input to EDH<\/jats:styled-content>. These results reveal a novel mechanism whereby peroxynitrite could promote post\u2010ischaemic brain injury.<\/jats:p><\/jats:sec>","DOI":"10.1111\/apha.12809","type":"journal-article","created":{"date-parts":[[2016,9,28]],"date-time":"2016-09-28T15:44:02Z","timestamp":1475077442000},"page":"150-166","source":"Crossref","is-referenced-by-count":4,"title":["Peroxynitrite formed during a transient episode of brain ischaemia increases endothelium\u2010derived hyperpolarization\u2010type dilations in thromboxane\/prostaglandin receptor\u2010stimulated rat cerebral arteries"],"prefix":"10.1111","volume":"220","author":[{"given":"Y.","family":"Onetti","sequence":"first","affiliation":[{"name":"Departament de Farmacologia, de Terap\u00e8utica i de Toxicologia Institut de Neuroci\u00e8ncies Facultat de Medicina Universitat Aut\u00f2noma de Barcelona Bellaterra Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A. 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