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DECREASED AFFINITY OF K-RECEPTOR BINDING DURING REPERFUSION FOLLOWING ISCHAEMIC PRECONDITIONING IN THE RAT HEART

机译:大鼠心脏缺血预处理后再灌注过程中K受体结合的亲和力降低

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The effects of ischaemic preconditioning with three cycles of ischaemia of 3 min and reperfusion of 5 min each cycle on: ventricular fibrillation threshold (VFT) and ventricular fibrillation (VF), and binding properties of tritiated U69,593, a selective kappa opioid-receptor (kappa-receptor) agonist, during subsequent ischaemia and/or reperfusion were studied in the rat heart. It was found that ischaemic preconditioning significantly enhnaced the VFT values during ischaemia and reperfusion. VF during the subsequent reperfusion period was also significantly reduced. The Kd of the [H-3]U69,593 binding sites in the sarcolemma of the heart at 5 min of reperfusion was signficantly increased following ischaemic preconditioning. The Bmax was, however, not altered after the preconditioning. The study provides evidence for the first time suggesting that the cardioprotective effects of ischaemic preconditioning may be related to a reduction in affinity of the cc-receptor binding. [References: 31]
机译:缺血预处理(三个局部缺血3分钟和每个循环5分钟的再灌注)对以下方面的影响:心室纤颤阈值(VFT)和心室纤颤(VF)以及tri化的U69,593(选择性κ阿片受体)的结合特性在大鼠心脏中研究了随后的缺血和/或再灌注过程中的(κ受体)激动剂。发现缺血预处理在缺血和再灌注期间显着增强了VFT值。在随后的再灌注期间,VF也显着降低。缺血预适应后,再灌注5分钟时,心脏肌膜中[H-3] U69,593结合位点的Kd显着增加。但是,预处理后Bmax不变。该研究首次提供证据,表明缺血预处理的心脏保护作用可能与cc受体结合亲和力的降低有关。 [参考:31]

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