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In the conditioned media from day-4 incubations, n-LDL increases total nitrogen oxides 20 times control EC (C-EC) levels. However, n-LDL did not alter EC NO synthase (eNOS) enzyme activity as measured by the [<jats:sup>3<\/jats:sup>H]citrulline assay.<jats:italic>N<\/jats:italic><jats:sup>\u03c9<\/jats:sup>-Nitro-<jats:sc>l<\/jats:sc>-arginine methyl ester, a specific inhibitor of eNOS activity, increases C-EC release of O<jats:sub>2<\/jats:sub><jats:sup>\u2212<\/jats:sup>by &gt;300% but decreases LDL-treated EC (LDL-EC) release by &gt;95%.<jats:sc>l<\/jats:sc>-Arginine inhibits the release of O<jats:sub>2<\/jats:sub><jats:sup>\u2212<\/jats:sup>from LDL-ECs by &gt;95% but did not effect C-EC release of O<jats:sub>2<\/jats:sub><jats:sup>\u2212<\/jats:sup>. Indomethacin and SKF 525A partially attenuate LDL-induced increases in O<jats:sub>2<\/jats:sub><jats:sup>\u2212<\/jats:sup>production by \u224850% and 30%, respectively. Thus, n-LDL increases O<jats:sub>2<\/jats:sub><jats:sup>\u2212<\/jats:sup>and NO production, which increases the likelihood of the formation of peroxynitrite (ONOO<jats:sup>\u2212<\/jats:sup>), a potent oxidant. n-LDL increases the levels of nitrotyrosine, a stable oxidation product of ONOO<jats:sup>\u2212<\/jats:sup>, and tyrosine by \u224850%. In spite of this increase in oxidative metabolism, analysis of thiobarbituric acid substances reveals that no significant changes in the oxidation of n-LDL occur during the 24-hour incubations with ECs. These data indicate that n-LDL directly perturbs endothelial oxidative metabolism and uncouples<jats:sc>l<\/jats:sc>-arginine metabolism from NO release to increase eNOS generation of O<jats:sub>2<\/jats:sub><jats:sup>\u2212<\/jats:sup>. Such changes may represent one of the earliest EC perturbations in atherogenesis.<\/jats:p>","DOI":"10.1161\/01.res.77.3.510","type":"journal-article","created":{"date-parts":[[2012,6,12]],"date-time":"2012-06-12T00:47:05Z","timestamp":1339462025000},"page":"510-518","update-policy":"https:\/\/doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":339,"title":["Native Low-Density Lipoprotein Increases Endothelial Cell Nitric Oxide Synthase Generation of Superoxide Anion"],"prefix":"10.1161","volume":"77","author":[{"suffix":"Jr","given":"Kirkwood A.","family":"Pritchard","sequence":"first","affiliation":[{"name":"From the Department of Pathology (K.A.P, D.M.S.), CardioVascular Research Center, Medical College of Wisconsin, Milwaukee; the Departments of Experimental Pathology (L.G., M.W., P.V., M.B.S.) and Physiology (M.S.W.), New York Medical College, Valhalla; and Boyer Center for Molecular Medicine (W.C.S.), Yale University School of Medicine, New Haven, Conn."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"Groszek","sequence":"additional","affiliation":[{"name":"From the Department of Pathology (K.A.P, D.M.S.), CardioVascular Research Center, Medical College of Wisconsin, Milwaukee; 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