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首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Effects of cadmium on cardiac metallothionein induction and ischemia-reperfusion injury in rats.
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Effects of cadmium on cardiac metallothionein induction and ischemia-reperfusion injury in rats.

机译:镉对大鼠心脏金属硫蛋白诱导和缺血再灌注损伤的影响。

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摘要

Myocardial ischemia-reperfusion injury is associated with an imbalance between the formation and the scavenging of reactive oxygen species. In this context, the protective role of the antioxidant metallothionein, a thiol-rich protein that is induced in different organs in response to heavy metals and oxidative conditions, has mainly been investigated in metallothionein-knockout mice or metallothionein-overexpressing mice. The aim of this study was to evaluate whether the administration of cadmium has a protective effect against cardiac ischemia-reperfusion injury and whether this is associated with induction of in vivo cardiac metallothionein. Forty-eight hours after an injection of 0, 1, or 2 mg/kg cadmium, isolated perfused rat hearts were submitted to 30 min of total global ischemia and 30 min of reperfusion. The ischemia-reperfusion sequence was associated with a significant decrease in cardiac metallothionein levels. Pretreatment with cadmium at a dose of 2 mg/kg (i) prevented this decrease and (ii) improved the postischemic recuperation of the coronary flow, the ventricular developed pressure, and therefore, the global postischemic functional recovery. These results showed that pretreatment of rats with 2 mg/kg cadmium induced cardioprotection against ischemia-reperfusion injuries, perhaps through an in vivo metallothionein induction that may be related to a metal activation of antioxidant systems.
机译:心肌缺血-再灌注损伤与活性氧的形成和清除之间的不平衡有关。在这种情况下,主要在金属硫蛋白敲除小鼠或过表达金属硫蛋白的小鼠中研究了抗氧化剂金属硫蛋白的保护作用,该金属硫蛋白是响应于重金属和氧化条件而在不同器官中诱导的富含硫醇的蛋白质。这项研究的目的是评估施用镉是否对心脏缺血-再灌注损伤具有保护作用,以及这是否与体内心脏金属硫蛋白的诱导有关。注射0、1或2 mg / kg镉后48小时,将离体的灌注大鼠心脏进行总局部缺血30分钟,再灌注30分钟。缺血-再灌注序列与心脏金属硫蛋白水平的显着降低有关。用2 mg / kg的镉进行预处理(i)防止了这种减少,并且(ii)改善了缺血后的冠状动脉血流回流量,心室发达的压力,从而改善了局部缺血后的功能恢复。这些结果表明,用2 mg / kg镉对大鼠进行预处理可诱导其抗缺血再灌注损伤的心脏保护作用,这可能是通过体内金属硫蛋白的诱导而实现的,这可能与抗氧化剂系统的金属活化有关。

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