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中国应用生理学杂志 ›› 2016, Vol. 32 ›› Issue (3): 209-213.doi: 10.13459/j.cnki.cjap.2016.03.005

• 研究论文 • 上一篇    下一篇

薯蓣皂苷对大鼠心肌收缩与钠-钙交换体的影响

杨帆, 韩钰, 丛恬(马先), 康毅, 李燕, 孙凯, 尹永强, 娄建石   

  1. 天津医科大学基础医学院药理学教研室, 天津 300070
  • 收稿日期:2015-11-12 修回日期:2016-02-01 出版日期:2016-05-28 发布日期:2018-06-12
  • 通讯作者: 尹永强,Tel:022-83336835;E-mail:13820043633@126.com;娄建石,Tel:022-83336860;E-mail:jianshilou@163.com E-mail:13820043633@126.com;jianshilou@163.com
  • 基金资助:
    天津应用基础及前言技术研究计划青年项目(14JCQNJC13700)

The effects of dioscin on myocardial contraction and sodium-cal-cium exchanger

YANG Fan, HAN Yu, CONG Tian-shen, KANG Yi, LI Yan, SUN Kai, YIN Yong-qiang, LOU Jian-shi   

  1. Department of Pharmacology, Basic Medical College, Tianjin Medical University, Tianjin 300070, China
  • Received:2015-11-12 Revised:2016-02-01 Online:2016-05-28 Published:2018-06-12
  • Supported by:
    天津应用基础及前言技术研究计划青年项目(14JCQNJC13700)

摘要: 目的:观察薯蓣皂苷(Dio)对大鼠心肌收缩作用以及胞内Ca2+浓度的影响,并初步探讨其作用机制与Na+-Ca2+交换体(NCX)的关系。方法:采用Langendorff逆行主动脉灌流法对大鼠离体心脏进行灌流,利用压力感受器插管法测定左心室相关心功能参数,记录及其在应用NCX选择性抑制剂SEA0400情况下对左心室收缩压(LVSP)、左心室舒张末期压(LVEDP)、左心室内压最大上升/下降速率(±dp/dtmax)以及心率(HR)的影响;利用激光共聚焦显微观察薯蓣皂苷及SEA0400对大鼠心肌细胞H9c2细胞内Ca2+浓度的影响。结果:离体心脏灌流结果显示,1 μmol/L Dio可显著增加LVSP,增加约19.7%(P<0.01);增加左室内压最大上升速率(+dp/dtmax),增加约9.6%;激光共聚焦测定Ca2+荧光强度实验结果显示:1 μmol/L Dio可使H9c2细胞中Ca2+相对荧光强度增加(P<0.01);而在SEA0400存在的情况下,1 μmol/L的Dio使细胞内Ca2+相对荧光强度变为(17.09±0.63),给予Dio后差异有显著性(P<0.01)。在细胞液中无Ca2+或无Na+时,给予1 μmol/L的Dio使Ca2+相对荧光强度减小,与给予1 μmol/L的Dio差异有显著性(P<0.01)。结论:Dio可增加左心室收缩压和最大上升速率,表现正性肌力作用;Dio可使细胞内Ca2+浓度增加,其作用机制与增加Na+内流,促进NCX反向转运有关。

关键词: 薯蓣皂苷, 心肌, 大鼠, 正性肌力作用, Na+-Ca2+交换体

Abstract: Objective:To investigate the inotropic effects of dioscin (Dio)in rat isolated-heart and intracellular free calcium concentration in isolated rat ventricular myocytes and to explore its mechanism preliminarily. Methods:Left ventricle contractile function was measured using the Langendorff non-recirculating mode of isolated rat heart perfusion. Effects of dioscin and dioscin+SEA0400, sodium-calcium exchanger (NCX) inhibitor, were investigated by measuring left ventricular systolic pressure (LVSP) and left ventricular end diastolic pressure (LVEDP). Also, heart rate (HR), peak rate of rise/fall of left ventricular pressure (±dp/dtmax) of isolated rat heart were calculated; Effects of dioscin and SEA0400 on intracellular free calcium concentration in rat H9c2 cells were measured by Fluo3-AM and then detected the fluorescence intensity with confocal microscopy. Results:With 1 μmol/L dioscin, LVSP was significantly increased by 19.7% (P<0.01) and dp/dtmax was increased by 9.6%; With 1 μmol/L dioscin, the relative fluorescence intensity of intracellular free calcium concentrations were strong significantly(P<0.01). While in presence of SEA0400, the relative fluorescence intensity was changed to 17.09±0.63 (P<0.01) by 1 μmol/L dioscin. With 1 μmol/L dioscin, the relative fluorescence intensity was weak(P<0.01) without calcium or sodium in the extracellular fluid. Conclusion:Dioscin shows positive inotropic effect on isolated rat heart, enhancing the LVSP and +dp/dtmax; Dioscin increases the intracellular concentration of Ca2+ in the cardiac myocytes by increasing Na+ influx and facilitating the reverse mode of the sodium-calcium exchanger.

Key words: dioscin, myocardium, rat, positive inotropic effect, sodium-calcium exchanger

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