目的观察比索洛尔对容量超负荷心衰大鼠左室心肌细胞内向整流钾电流((I_(K1))的影响。方法成年雄性SD大鼠(180-200 g)随机分为假手术组、心衰组和比索洛尔干预组,采用腹主动脉-下腔静脉穿刺造瘘法制作容量超负荷心衰模型。术后8周,比索...目的观察比索洛尔对容量超负荷心衰大鼠左室心肌细胞内向整流钾电流((I_(K1))的影响。方法成年雄性SD大鼠(180-200 g)随机分为假手术组、心衰组和比索洛尔干预组,采用腹主动脉-下腔静脉穿刺造瘘法制作容量超负荷心衰模型。术后8周,比索洛尔干预组给予比索洛尔(1 mg/kg,1次/d)灌胃,干预4周后,检测血清脑钠肽(BNP)及超声心动图以评价心功能。急性酶解法分离大鼠左室心肌细胞,采用全细胞膜片钳技术记录动作电位及I_(K1)电流,并绘制I-V曲线。结果心衰组与假手术组大鼠比较,心功能明显下降,血清BNP水平(pmol/L)明显升高(1 562.89±153.26 vs 225.57±63.62,P<0.01),动作电位时程(APD,ms)延长(APD_(90):324.85±21.66 vs 137.80±15.24,P<0.01),I_(K1)电流密度减小(-140 m V:-23.20±2.10 vs-35.55±2.78,P<0.01)。比索洛尔干预可明显改善心功能,缩短APD,增加I_(K1)电流密度(-140 m V:-27.16±2.62vs-23.20±2.10,P<0.01)。结论比索洛尔干预可改善慢性心衰大鼠的心功能,增加I_(K1)电流密度。展开更多
Objective： To study the effect of Xinjining extract （心悸宁, XJN） on inward rectifier potassium current （IKI） in ventricular myocyte （VMC） of guinea pigs and its anti-arrhythmic mechanism on ion channel level. ...Objective： To study the effect of Xinjining extract （心悸宁, XJN） on inward rectifier potassium current （IKI） in ventricular myocyte （VMC） of guinea pigs and its anti-arrhythmic mechanism on ion channel level. Methods： Single VMC was enzymatically isolated by zymolisis, and whole-cell patch clamp recording technique was used to record the Ikl in VMC irrigated with XJN of different concentrations （1.25, 2.50, 5.00 g/L; six samples for each）. The stable current and conductance of the inward component of IK1 as well as the outward component of peak IK1 and conductance of it accordingly was recorded when the test voltage was set on -110 mV. Results： The suppressive rate of XJN on the inward component of IK1 was 9.54% ± 5.81%, 34.82% ± 15.03%, and 59.52% ± 25.58% with a concentration of 1.25, 2.50, and 5.00 g/L, respectively, and that for the outward component of peak IK1 was 23.94%± 7.45%, 52.98%± 19.62%, and 71.42% ± 23.01%, respectively （all P〈0.05）. Moreover, different concentrations of XJN also showed effects for reducing IK1 conductance. Conclusion： XJN has inhibitory effect on IK1in guinea pig＇s VMC, and that of the same concentration shows stronger inhibition on outward component than on inward component, which may be one of the mechanisms of its anti-arrhythmic effect.展开更多
文摘目的观察比索洛尔对容量超负荷心衰大鼠左室心肌细胞内向整流钾电流((I_(K1))的影响。方法成年雄性SD大鼠(180-200 g)随机分为假手术组、心衰组和比索洛尔干预组,采用腹主动脉-下腔静脉穿刺造瘘法制作容量超负荷心衰模型。术后8周,比索洛尔干预组给予比索洛尔(1 mg/kg,1次/d)灌胃,干预4周后,检测血清脑钠肽(BNP)及超声心动图以评价心功能。急性酶解法分离大鼠左室心肌细胞,采用全细胞膜片钳技术记录动作电位及I_(K1)电流,并绘制I-V曲线。结果心衰组与假手术组大鼠比较,心功能明显下降,血清BNP水平(pmol/L)明显升高(1 562.89±153.26 vs 225.57±63.62,P<0.01),动作电位时程(APD,ms)延长(APD_(90):324.85±21.66 vs 137.80±15.24,P<0.01),I_(K1)电流密度减小(-140 m V:-23.20±2.10 vs-35.55±2.78,P<0.01)。比索洛尔干预可明显改善心功能,缩短APD,增加I_(K1)电流密度(-140 m V:-27.16±2.62vs-23.20±2.10,P<0.01)。结论比索洛尔干预可改善慢性心衰大鼠的心功能,增加I_(K1)电流密度。
基金Supported by the Fundfor Innovation of Phenomof Henan Province(No.0521002400)
文摘Objective： To study the effect of Xinjining extract （心悸宁, XJN） on inward rectifier potassium current （IKI） in ventricular myocyte （VMC） of guinea pigs and its anti-arrhythmic mechanism on ion channel level. Methods： Single VMC was enzymatically isolated by zymolisis, and whole-cell patch clamp recording technique was used to record the Ikl in VMC irrigated with XJN of different concentrations （1.25, 2.50, 5.00 g/L; six samples for each）. The stable current and conductance of the inward component of IK1 as well as the outward component of peak IK1 and conductance of it accordingly was recorded when the test voltage was set on -110 mV. Results： The suppressive rate of XJN on the inward component of IK1 was 9.54% ± 5.81%, 34.82% ± 15.03%, and 59.52% ± 25.58% with a concentration of 1.25, 2.50, and 5.00 g/L, respectively, and that for the outward component of peak IK1 was 23.94%± 7.45%, 52.98%± 19.62%, and 71.42% ± 23.01%, respectively （all P〈0.05）. Moreover, different concentrations of XJN also showed effects for reducing IK1 conductance. Conclusion： XJN has inhibitory effect on IK1in guinea pig＇s VMC, and that of the same concentration shows stronger inhibition on outward component than on inward component, which may be one of the mechanisms of its anti-arrhythmic effect.
