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  • 1
    ISSN: 1435-2451
    Keywords: Oxygen radicals ; Reperfusion ; Liver ; Rat ; Electron-spin-resonance ; Spin trap PBN
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Freie Sauerstoffradikale werden als Kausalfaktor in einer Vielzahl von Erkrankungen, u. a. auch im postischämischen Reperfusionsschaden vermutet. Der Nachweis freier Radikale ist schwierig and wird in der Regel indirekt geführt. Mit der Elektronenspinresonanz gelingt es, in einem Tiermodell mit Leberischämie und -reperfusion das Auftreten von Radikalen im Lebergewebe nach 60minütiger Leberischämie nachzuweisen. Bereits nach 5minütiger Reperfusion treten vermehrte Radikale auf. Das Maximum der Radikalentstehung wird nach 15minütiger Reperfusion erreicht, wobei die übermäβige Produktion von freien Radikalen für mindestens 45 min Reperfusion nachweisbar bleibt. Soll these Kausalkette des postischämischen Reperfusionsschadens unterbrochen werden, müssen Fängermecha-nismen bereits zu Beginn der Reperfusion in ausreichender Konzentration im Gewebe vorhanden sein.
    Notes: Summary The generation of free oxygen radicals is presumed to be a pathogenetic principle in various conditions, primarily in postischemic reperfusion injury. Their assessment is difficult. ESR is an excellent tool to assess free radicals directly. 1n an experimental model of rat liver ischemia and reperfusion the increased generation of free radicals during reperfusion in liver tissue could be demonstrated after 60 min of liver ischemia. Elevated production rates of radicals could be detected after 5 min of reperfusion for at least 45 min with a maximum after 15 min of reperfusion. Scavenging of these radicals has to start in the very beginning of reperfusion.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 69 (1991), S. 1095-1098 
    ISSN: 1432-1440
    Keywords: Liver ; Warm ischemia ; Reperfusion ; Oxygen radicals ; Allopurinol ; Deferoxamine ; Iron ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The generation of free oxygen radicals is presumed as a substantial pathogenetic principle in reperfusion injury. Although demonstrated in gut, muscle and kidneys its role in liver reperfusion injury is still under investigation. In an experimental rat model of warm liver ischemia of 60 min and 8 h reperfusion electron resonance spectroscopy assessed the increased generation of free radicals in early reperfusion period, leading to a decrease of polyunsaturated free fatty acids in liver tissue within 15 min of reperfusion. Histologically, single cell death, local and patchy necrosis of hepatic lobuli could be observed after 8 h reperfusion (n=6). These histologic signs of liver injury could be attenuated by administration of superoxid-dismutase in combination with catalase but not by allopurinol. Best results could be obtained by deferoxamine. This indicates that increased generation of free oxygen radicals in reperfusion is not caused by the known conversion of xanthine-dehygrogenase to -oxidase but is mediated by an increased generation of hydroxyl-radicals, which can be scavenged by deferoxamine.
    Type of Medium: Electronic Resource
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