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We examined whether this mechanism is involved in the endothelium\u2010dependent hyperpolarization\u2010mediated responses to compensate reduced <jats:styled-content style=\"fixed-case\">NO<\/jats:styled-content>\u2010mediated responses in diabetes mellitus during coronary occlusion in dogs in vivo.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Canine subepicardial collateral coronary small arteries (\u2265100\u00a0\u03bcm) and arterioles (&lt;100\u00a0\u03bcm) were observed by an intravital microscope. Experiments were performed during occlusion of the left anterior descending coronary artery (90\u00a0minutes) under the following conditions (n\u00a0=\u00a06 each); (i) control, (ii) diabetes mellitus, and (iii) diabetes mellitus+L\u2010<jats:styled-content style=\"fixed-case\">NMMA<\/jats:styled-content>+<jats:styled-content style=\"fixed-case\">K<jats:sub>C<\/jats:sub><\/jats:styled-content><jats:sub>a<\/jats:sub> channel blockade. Vascular and myocardial levels of caveolin\u20101, <jats:styled-content style=\"fixed-case\">eNOS<\/jats:styled-content>, and caspase\u20103 were measured by <jats:styled-content style=\"fixed-case\">ELISA<\/jats:styled-content>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Caveolin\u20101 levels in the ischemic area were greater in coronary microvessels than in conduit arteries in the control group. <jats:styled-content style=\"fixed-case\">NO<\/jats:styled-content>\u2010mediated coronary vasodilatations of small arteries to bradykinin did not increase in diabetes mellitus associated with decreased <jats:styled-content style=\"fixed-case\">eNOS<\/jats:styled-content> phosphorylation at Ser1177 compared with baseline of controls and were restored by compensation of endothelium\u2010dependent hyperpolarization and were suppressed by <jats:styled-content style=\"fixed-case\">K<jats:sub>C<\/jats:sub><\/jats:styled-content><jats:sub>a<\/jats:sub> channel blockade.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p><jats:styled-content style=\"fixed-case\">NO<\/jats:styled-content>\u2010mediated vasodilatations of small coronary arteries during coronary occlusion are impaired in diabetes mellitus and are compensated by endothelium\u2010dependent hyperpolarization of arterioles in dogs in vivo.<\/jats:p><\/jats:sec>","DOI":"10.1111\/micc.12456","type":"journal-article","created":{"date-parts":[[2018,4,17]],"date-time":"2018-04-17T20:13:11Z","timestamp":1523995991000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Endothelium\u2010dependent hyperpolarization\u2010mediated vasodilatation compensates nitric oxide\u2010mediated endothelial dysfunction during ischemia in diabetes\u2010induced canine coronary collateral microcirculation in 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