【摘要】 目的观察睡眠剥夺后大鼠的心电图改变及其心室肌组织KV4.3钾离子通道mRNA和蛋白表达情况,探讨睡眠剥夺致心律失常的发生机制。方法 48只清洁级健康成年雄性SD大鼠随机分6组(每组8只):正常对照(CC)组,大平台实验(TC)组及睡眠剥夺(SD)13、5、7、d组。睡眠剥夺(SD)组以改良多平台睡眠剥夺法(MMPM)建立睡眠剥夺模型,观察13、5、、7d睡眠剥夺后大鼠心电图的变化,并通过RT-PCR及Western blotting方法检测大鼠心肌组织KV4.3钾离子通道基因的mRNA和蛋白表达水平。结果睡眠剥夺后大鼠心电图改变以心律失常为主:与CC组大鼠比较,TC组大鼠心电图表现为窦性心动过速;SD1d组出现频发房性早搏;SD3d组出现室性心律失常(表现为频发的多形性室性早搏及短阵室速);SD5d组呈不完全性右束支传导阻滞波形;SD7d组房性心律与室性心律分离,呈三度房室传导阻滞波形,伴室性逸搏、窦性停搏,ST段明显抬高并与高尖的T波融合。随着睡眠剥夺时间的延长,心肌组织KV4.3钾离子通道mRNA及蛋白表达水平均呈逐渐下调趋势,至睡眠剥夺7d时,mRNA及蛋白表达量分别仅为正常大鼠的1/9和1/4。结论睡眠剥夺可致大鼠心律失常,并随剥夺时间的延长而加重;心肌组织KV4.3钾离子通道基因表达下调可能是睡眠剥夺致心律失常的机制之一。更多还原

【Abstract】 Objective To investigate the effect of sleep deprivation(SD) on the changes in electrocardiogram and mRNA and protein expression of KV4.3 voltage-gated potassium channel in rats,and explore the related mechanisms of arrhythmia induced by SD.Methods A total of 48 adult male SD rats were randomly divided into 6 groups(8 each): normal control(CC) group,tank control(TC) group,1-,3-,5-and 7-day SD group.Animal model of SD was established by modified multiple platform method,and electrocardiogram was recorded on 1st,3rd,5th,and 7th of experiment.Protein and mRNA expressions of KV4.3 voltage-gated potassium channel were measured by real-time PCR and Western blotting analysis.Results The main changes on electrocardiogram following SD were arrhythmia.Compared with the CC group,rats in TC group showed sinus tachycardia in electrocardiogram: frequent atrial premature beats were observed one day after SD;ventricular arrhythmias,such as frequent polymorphic ventricular premature beats and paroxysmal ventricular tachycardia were observed three days after SD;incomplete right bundle branch block wave occurred five days after SD;the electrocardiogram showed third-degree atrioventricular(AV) block wave seven days after SD,which indicated atrial arrhythmia and ventricular arrhythmia respectively.Ventricular escape beat,sinus arrest as well as the fusion of obviously elevated ST segment and T-wave were also observed.The expression levels of KV4.3 voltage-gated potassium channel decreased with prolongation of SD time.The expression of mRNA and protein of KV4.3 potassium channel in 7-day SD rats were only the one ninth and one fourth of levels in CC group.Conclusion Sleep deprivation can cause arrhythmia,and decreased expression of KV4.3 voltage-gated potassium channel may possibly be one of the reasons of arrhythmia induced by SD.更多还原