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首页> 外文期刊>Cellular Physiology and Biochemistry >Activation of Volume Regulated Chloride Channels Protects Myocardium from Ischemia/reperfusion Damage in Second-window Ischemic Preconditioning
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Activation of Volume Regulated Chloride Channels Protects Myocardium from Ischemia/reperfusion Damage in Second-window Ischemic Preconditioning

机译:激活氯调节通道的通道可保护心肌免受缺血/再灌注损伤的二次窗口缺血预处理。

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Activation of volume regulated chloride channels (iVRCCs/i) has been shown to be cardioprotective in ischemic preconditioning (IPC) of isolated hearts but the underlying molecular mechanisms remain unclear. Recent independent studies support that ClC-3, a ClC voltage-gated chloride channel, may function as a key component of the iVRCCs/i. Thus, ClC-3 knockout (iClcn3sup-/-/sup/i) mice and their age-matched heterozygous (iClcn3sup+/-/sup/i) and wild-type (iClcn3sup+/+/sup/i) littermates were used to test whether activation of iVRCCs/i contributes to cardioprotection in early and/or second-window IPC. Targeted disruption of ClC-3 gene caused a decrease in the body weight but no changes in heart/body weight ratio. Telemetry ECG and echocardiography revealed no differences in ECG and cardiac function under resting conditions among all groups. Under treadmill stress (10 m/min for 10 min), the iClcn3sup-/-/sup/i mice had significant slower heart rate (648±12 bpm) than iClcn3sup+/+/sup/i littermates (737±19 bpm, n=6, P0.05). iEx vivo/i IPC in the isolated working-heart preparations protected cardiac function during reperfusion and significantly decreased apoptosis and infarct size in all groups. iIn vivo/i early IPC significantly reduced infarct size in all groups including iClcn3sup-/-/sup/i mice (22.7±3.7% vs control 40.1±4.3%, n=22, P=0.004). Second-window IPC significantly reduced apoptosis and infarction in iClcn3sup+/+/sup/i (22.9±3.2% vs 45.7±5.4%, n=22, P0.001) and iClcn3sup+/-/sup/i mice (27.5±4.1% vs 42.2±5.7%, n=15, P0.05) but not in iClcn3sup-/-/sup/i littermates (39.8±4.9% vs 41.5±8.2%, n=13, P0.05). Impaired cell volume regulation of the iClcn3sup-/-/sup/i myocytes may contribute to the failure of cardioprotection by second-window IPC. These results strongly support that activation of iVRCCs/i may play an important cardioprotective role in second-window IPC.
机译:在离体心脏的缺血预处理(IPC)中,已激活了体积调节氯离子通道( VRCCs )具有心脏保护作用,但其潜在的分子机制仍不清楚。最近的独立研究支持ClC-3(ClC电压门控氯化物通道)可能是 VRCC 的关键组成部分。因此,ClC-3基因敲除( Clcn3 -/- )小鼠及其年龄匹配的杂合子( Clcn3 +/- i>)和野生型( Clcn3 + / + )同窝仔用于测试 VRCC 的激活是否有助于早期和/或心脏保护或第二窗口IPC。 ClC-3基因的靶向破坏导致体重下降,但心脏/体重比没有变化。遥测心电图和超声心动图显示,所有组在静息状态下的心电图和心功能均无差异。在跑步机压力下(10 m / min持续10分钟), Clcn3 -/- 小鼠的心率(648±12 bpm)明显低于 Clcn3 < sup> + / + 同窝仔(737±19 bpm,n = 6,P <0.05)。在所有工作组中,离体心脏工作制剂中的离体 IPC保护了心脏功能,并显着降低了细胞凋亡和梗塞面积。体内早期早期IPC显着降低了所有组的梗死面积,包括 Clcn3 -/- 小鼠(22.7±3.7%,对照组40.1±4.3%, n = 22,P = 0.004)。第二窗口IPC显着降低了 Clcn3 + / + 中的凋亡和梗死(22.9±3.2%vs 45.7±5.4%,n = 22,P <0.001)和 Clcn3 +/- 小鼠(27.5±4.1%vs 42.2±5.7%,n = 15,P <0.05)但不在 Clcn3 -/-< / sup> 同窝仔(39.8±4.9%vs 41.5±8.2%,n = 13,P> 0.05)。 Clcn3 -/- 心肌细胞的细胞体积调节能力受损,可能会导致第二窗口IPC的心脏保护功能失败。这些结果强烈支持 VRCC 的激活可能在第二窗口IPC中起重要的心脏保护作用。

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