Role of nitric oxide and peroxynitrite in the cytokine-induced sustained myocardial dysfunction in dogs in vivo

Jun Ichi Oyama, Hiroaki Shimokawa, Hidetoshi Momii, Xiao Shu Cheng, Naoto Fukuyama, Yukinori Arai, Kensuke Egashira, Hiroe Nakazawa, Akira Takeshita

    研究成果: Contribution to journalArticle査読

    96 被引用数 (Scopus)

    抄録

    Studies in vitro suggested that inflammatory cytokines could cause myocardial dysfunction. However, the detailed mechanism for the cytokine- induced myocardial dysfunction in vivo remains to be examined. We thus examined this point in our new canine model in vivo, in which microspheres with and without IL-1β were injected into the left main coronary artery. Left ventricular ejection fraction (LVEF) was evaluated by echocardiography for 1 wk. Immediately after the microsphere injection, LVEF decreased to ~ 30% in both groups. While LVEF rapidly normalized in 2 d in the control group, it was markedly impaired in the IL-1β group even at day 7. Pretreatment with dexamethasone or with aminoguanidine, an inhibitor of inducible nitric oxide synthase, prevented the IL-1β-induced myocardial dysfunction. Nitrotyrosine concentration, an in vivo marker of the peroxynitrite production by nitric oxide and superoxide anion, was significantly higher in the myocardium of the IL-1β group than in that of the control group or the group cotreated with dexamethasone or aminoguanidine. There was an inverse linear relationship between myocardial nitrotyrosine concentrations and LVEF. These results indicate that IL-1β induces sustained myocardial dysfunction in vivo and that nitric oxide produced by inducible nitric oxide synthase and the resultant formation of peroxynitrite are substantially involved in the pathogenesis of the cytokine- induced sustained myocardial dysfunction in vivo.

    本文言語英語
    ページ(範囲)2207-2214
    ページ数8
    ジャーナルJournal of Clinical Investigation
    101
    10
    DOI
    出版ステータス出版済み - 5 15 1998

    All Science Journal Classification (ASJC) codes

    • 医学(全般)

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