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首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Effects of pyruvate on the energetics of rat ventricles stunned by ischemia-reperfusion
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Effects of pyruvate on the energetics of rat ventricles stunned by ischemia-reperfusion

机译:丙酮酸对大鼠缺血再灌注后脑室能量的影响

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Pyruvate (Pyr) was proposed as an additive to cold high-K+-low-Ca2+ cardioplegia (CPG) to protect the heart during surgery. We explored whether Pyr and CPG would work synergistically to protect rat hearts from stunning during ischemia-reperfusion (I/R). We measured the heat release and contractility of perfused ventricles during I/R, and the cytosolic and mitochondrial [Ca2+] in cardiomyocytes by confocal microscopy. We found that under cold-CPG (30 °C), 10 mmol·L-1 Pyr reduced the post-ischemic contractile recovery (PICR) as well as muscle economy, when added either before ischemia or during I/R, which was reversed by blockade of UCam. In noncardioplegic hearts, Pyr was cardioprotective when it was present during I/R, more so at 37 °C than at 30 °C, with improved economy. In cardiomyocytes, the addition of Pyr to CPG slightly increased the mitochondrial [Ca2+] but decreased cytosolic [Ca2+]. The results suggest that Pyr only protects hearts from stunning when present before ischemia and during reperfusion, and that it dampens the cardioprotective properties of CPG. The mechanisms underlying such different behavior depend on the dynamic balance between Pyr stimulation of the energetic state and mitochondrial Ca2+ uptake. Our results support the use of Pyr in stunned hearts, but not in cold high-K+ cardioplegia.
机译:丙酮酸(Pyr)被建议作为冷高K +-低Ca2 +心脏停搏(CPG)的添加剂,以在手术过程中保护心脏。我们探讨了Pyr和CPG是否会协同作用以保护大鼠心脏免于缺血再灌注(I / R)期间的惊吓。我们通过共聚焦显微镜测量了I / R期间灌注心室的热释放和收缩力,以及心肌细胞中的胞质和线粒体[Ca2 +]。我们发现,在低温CPG(30°C)下,在缺血前或I / R期间添加10mmol·L-1Pyr会降低缺血后收缩恢复(PICR)以及肌肉经济性,这是可以逆转的被UCam封锁。在非心律失常的心脏中,Pyr在I / R期间具有心脏保护作用,在37°C时比在30°C时更具保护性,从而提高了经济性。在心肌细胞中,向CPG中添加Pyr会稍微增加线粒体[Ca2 +],但降低胞质[Ca2 +]。结果表明,Pyr仅在缺血前和再灌注期间保护心脏免受惊吓,并且会削弱CPG的心脏保护特性。这种不同行为的潜在机制取决于高能状态的Pyr刺激与线粒体Ca2 +吸收之间的动态平衡。我们的研究结果支持在惊呆的心脏中使用Pyr,但在寒冷的高K +心脏停搏中不支持使用Pyr。

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