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題名 | Selective Inhibition of Inducible Nitric Oxide in Ischemia-Reperfusion of Rat Small Intestine=大鼠小腸缺血再灌注時一氧化氮生成之選擇性抑制 |
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作者 | 陳日昌; 陳漢明; 石明煌; 范玲玲; 戚祖沅; 紀中丕; 陳敏夫; | 書刊名 | 臺灣醫學會雜誌 |
卷期 | 99:3 2000.03[民89.03] |
頁次 | 頁213-218 |
分類號 | 415.55 |
關鍵詞 | 大鼠; 小腸; 缺血; 灌注; 一氧化氮; 選擇性抑制; I凁schemia-reperfusion; Nitric oxide; Aminoguanidine; N-nitro-L-arginine methyl ester; L-arginine; Microcirculation; Adhesion; CD11b; |
語文 | 英文(English) |
英文摘要 | Purpose: We investigated the role of constitutive and inducible nitric oxide (NO) synthases in intestinal ischemia–reperfusion (I/R) injury by observing the alterations in hemodynamics and intestinal microcirculation in response to I/R in rats, with or without inhibitors of NO synthases. Methods: Adult male Sprague-Dawley rats (n = 9/group) received a standard I/R procedure alone: I/R plus intravenous administration of aminoguanidine (an inhibitor of inducible NO synthase); I/R plus L-NAME (N G -nitro-L-arginine methyl ester, an inhibitor of constitutive and inducible NO synthase); IR + L-Arg (L-arginine, an NO precursor); or a sham operation plus the vehicle. The I/R procedure was performed by clamping the perfusion vessels of a segment of the terminal ileum, and medication was administered intravenously before and after intestinal ischemia. The intestinal perfusion and leukocyte-endothelial interactions were evaluated with in vivo microscopy and laser Doppler flowmetry. Surface expression of CD11b (an adhesion molecule) of circulating granulocytes was measured with flow cytometry. Results: Intestinal I/R produced circulatory alterations, intestinal microcirculatory derangement, energy depletion, and lipid peroxidation. Aminoguanidine significantly attenuated the reperfusion-related depression of mean arterial pressure (MAP), the decrease in intestinal perfusion index, the decrease in tissue ATP preservation, the increase in tissue malondialdehyde (MDA) level, and the expression of CD11b of circulating granulocytes. Administration of L-NAME had only minor and transient effects on reperfusion-related changes of MAP, intestinal flux, numbers of adherent leukocytes, and CD11b expression, but had some protective effects on tissue MDA and adenosine triphosphate levels and flow velocity. L-Arg further decreased the MAP but did not affect reperfusion-related variables. Conclusions: Our results show that the selective inhibition of inducible NO synthase by aminoguanidine attenuates the hemodynamic and microcirculatory derangement that results from intestinal I/R. |
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