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• W2164028836 abstract "Although studies in vitro have implicated oxygen-derived free radicals as possible mediators of inflammatory cytokine-induced cell injury, the role of the radicals in the cytokine-induced myocardial dysfunction in vivo remains unclear. The present study was designed to address this point in our novel canine model of cytokine-induced myocardial dysfunction in vivo.Studies were performed in mongrel dogs, in which microspheres (MS, 15 microns in diameter) with and without interleukin-1 beta (IL-1 beta) were injected into the left main coronary artery (control and IL-1 beta group). Left ventricular ejection fraction (LVEF) was evaluated by echocardiography for 1 week.Immediately after the intracoronary injection of MS (10(6)/kg), LVEF equally decreased to approximately 30% in both the control and IL-1 beta group. While LVEF rapidly recovered within 2 days in the control group, it remained depressed in the IL-1 beta group until day 7 (p < 0.0001 vs. control group). Pretreatment with OPC-6535 (an inhibitor of superoxide production) before (2 mg/kg i.v.) and 1 and 2 days after IL-1 beta MS application (1 mg/kg i.v.) prevented the IL-1 beta-induced myocardial dysfunction. Superoxide production in the myocardium was significantly higher in the IL-1 beta group than in the control group at day 2 (p < 0.01), and OPC-6535 significantly suppressed the IL-1 beta-induced superoxide production (p < 0.01). An HPLC assay showed that nitrotyrosine, a marker of the formation of peroxynitrite by superoxide anion and nitric oxide, was present in the myocardium treated with IL-1 beta but not in that with control MS. OPC-6535 abolished the IL-1 beta-induced formation of myocardial nitrotyrosine.These results indicate that superoxide anion and the resultant formation of peroxynitrite may substantially be involved in the pathogenesis of the cytokine-induced myocardial dysfunction in dogs in vivo." @default.
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• W2164028836 date "1999-06-01" @default.
• W2164028836 modified "2023-10-18" @default.
• W2164028836 title "Role of superoxide anion in the pathogenesis of cytokine-induced myocardial dysfunction in dogs in vivo" @default.
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• W2164028836 doi "https://doi.org/10.1016/s0008-6363(98)00317-4" @default.
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