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Positive correlation of tumor necrosis factor-alpha early expression in myocardium and ventricular arrhythmias in rats with acute myocardial infarction.

机译:急性心肌梗死大鼠心肌和室性心律失常中肿瘤坏死因子-α早期表达的正相关。

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BACKGROUND: Tumor necrosis factor-alpha (TNF-alpha) is found to play important roles in acute myocardial infarction (AMI). Ventricular arrhythmias arising from AMI are leading causes of sudden cardiac death (SCD). We sought to clarify the effect of TNF-alpha early expression on ventricular arrhythmias in rats with AMI and its mechanism. METHODS: Rats with AMI were induced by left anterior descending coronary branch ligation. The mRNA and protein levels of TNF-alpha in myocardium were detected by real-time fluorescent quantitative PCR, Western blotting and histochemistry. Meanwhile, electrocardiogram was recorded. Different concentrations of TNF-alpha were added to isolated rat hearts in isolated heart perfusions. Effect of TNF-alpha on intracellular Ca(2+) concentration was detected by laser confocal technique. RESULTS: In AMI rats, mRNA and protein levels of TNF-alpha were higher than control (p <0.05), and the occurrence time of ventricular arrhythmias coincided with the secretion of TNF-alpha. TNF-alpha may cause ventricular arrhythmias in isolated rat heart perfusion models. Intracellular Ca(2+) intensity may quickly be increased by TNF-alpha. CONCLUSIONS: Our results reveal the positive correlation between TNF-alpha early expression and ventricular arrhythmias in rats with AMI. This effect may be associated with the increased intracellular Ca(2+) intensity caused by TNF-alpha.
机译:背景:肿瘤坏死因子-α(TNF-alpha)被发现在急性心肌梗死(AMI)中起重要作用。 AMI引起的室性心律失常是心脏性猝死(SCD)的主要原因。我们试图阐明TNF-α早期表达对AMI大鼠室性心律失常的作用及其机制。方法:采用左前降支冠状动脉结扎术诱发急性心肌梗死大鼠。实时荧光定量PCR,Western blotting和组织化学检测心肌中TNF-α的mRNA和蛋白水平。同时,记录心电图。在离体心脏灌注中,将不同浓度的TNF-α加入离体大鼠心脏。通过激光共聚焦技术检测TNF-α对细胞内Ca(2+)浓度的影响。结果:在AMI大鼠中,TNF-α的mRNA和蛋白水平高于对照组(p <0.05),室性心律失常的发生时间与TNF-α的分泌相吻合。在孤立的大鼠心脏灌注模型中,TNF-α可能导致室性心律失常。 TNF-alpha可能会迅速增加细胞内Ca(2+)的强度。结论:我们的结果揭示了AMI大鼠中TNF-α的早期表达与室性心律失常之间呈正相关。这种作用可能与由TNF-α引起的细胞内Ca(2+)强度增加有关。

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