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快律宁胶囊及其含药血清对大鼠心室肌细胞内钙离子平均荧光强度的作用
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摘要
目的观察快律宁胶囊(以下简称为KLN)及其含药血清对单个大鼠心室肌细胞内钙离子(Ca~(2+))平均荧光强度的影响。
     方法将SD大鼠随机分为空白对照组和KLN高、中、低剂量组,分别灌胃给药后取血,制备KLN含药血清。分离单个大鼠心室肌细胞,Fluo-3/AM探针进行荧光标记,用激光共聚焦显微镜扫描观察,于第2次和第3次扫描之间加入药物。观察KLN对静息细胞胞浆Ca~(2+)平均荧光强度和对心肌细胞钙库释放的影响,以及KLN含药血清对静息细胞胞浆Ca~(2+)平均荧光强度的影响。
     结果①与对照组相比,KLN高、中、低剂量均能明显升高静息细胞胞浆Ca~(2+)平均荧光强度(P<0.05),均随时间延长呈逐渐增高趋势,升高的程度呈剂量依赖性。②与对照组相比,KLN高、中剂量能明显升高无钙台氏液中心肌细胞胞浆Ca~(2+)平均荧光强度(P<0.01),促进心肌细胞钙库释放,随时间推移,心肌细胞内Ca~(2+)平均荧光强度呈逐渐上升趋势,高剂量KLN的作用与中剂量相比更加迅速、显著。而低剂量KLN对心肌细胞内Ca~(2+)平均荧光强度的影响与对照组相比无显著性差异(P>0.05)。③与正常血清对照组相比,KLN高、中剂量含药血清可明显增加静息细胞胞浆Ca~(2+)平均荧光强度(P<0.01),而低剂量对静息细胞胞浆Ca~(2+)平均荧光强度的影响则与正常血清对照组无明显统计学差异(P>0.05)。
     结论KLN既能促进心肌细胞自发的外钙内流,又能促进心肌细胞内的钙库释放。前者说明KLN抗心律失常作用与其对Ca~(2+)通道的作用有关,而后者说明本药还可能具有正性肌力作用。KLN含药血清的作用效果与直接向细胞外液中加入KLN结果一致。
Objective To observe the effect of KLN capsules (KLN) and its drug serum on meanfluorescence intensity of intracellular calcium in rat ventricular muscle cells.
     Methods SD rats were divided into four groups, control group and KLN high-dosegroup, KLN medium-dose group and KLN low-dose group. After intragastricadministration, collect the blood to prepare KLN drug serum. Separate a single ratventricular muscle cell. Using Fluo-3/AM probe to make the cells fluorescently labeledand observe [Ca~(2+)]iwith a laser scanning confocal microscope. Add KLN or its drug serumto extracellular solution between the2nd and3rd scan. Observe the effect of KLN onresting cells’[Ca~(2+)]i and release of intracellular calcium store, as well as the effect of KLNdrug serum on the resting cells’[Ca~(2+)]i.
     Results①Compared with the control group, KLN high, medium and low dosecould significantly increase [Ca~(2+)]iin resting cell cytoplasm (P<0.05), showing a graduallyincreased trend over time and dose dependence.②In calcium-free Tyrode's solution,compared with the control group, KLN high, medium dose significantly increase [Ca~(2+)]iincytoplasm (P<0.01), promoting intracellular calcium to release.[Ca~(2+)]iin cytoplasmshowed a gradual increase trend over time. KLN high doses took effect more quickly andsignificantly than medium-dose. KLN low-doses showed no significant differencecompared with control group (P>0.05).③Compared with the normal serum controlgroup, KLN high-dose drug serum and KLN medium-dose drug serum significantlyincrease [Ca~(2+)]iin resting cell cytoplasm (P<0.01), while the low-doses showed nosignificant statistical difference (P>0.05).
     Conclusion KLN promoted myocardial cell spontaneous extracellular calcium influx,and contribute to myocardial intracellular calcium store release. The former indicates thatthe mechanisms of the KLN anti-arrhythmic effects may be related to the calcium channel,while the latter indicates that the drug may also have a positive inotropic effect. KLN drugserum showed the same effect with KLN.
引文
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