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中国临床药理学与治疗学 ›› 2007, Vol. 12 ›› Issue (8): 865-868.

• 基础研究 • 上一篇    下一篇

布比卡因对大鼠心室肌细胞内钙的影响

祝懿, 徐龙河, 张宏   

  1. 解放军总医院麻醉科, 北京 100853
  • 收稿日期:2007-03-13 修回日期:2007-08-08 出版日期:2007-08-26 发布日期:2020-10-27
  • 通讯作者: 张宏, 女, 主任医师、教授, 博导, 主要从事麻醉监测、疼痛、脏器保护和麻醉药理研究。Tel:010-66937269 E-mail:zhlina@publi c.bta.net.cn
  • 作者简介:祝,男,硕士,主治医师,主要研究方向:麻醉药理和临床麻醉。Tel:010-66937269 E-mail:zhuyi301@tom.com
  • 基金资助:
    国家自然科学基金项目(30300327)

Effects of bupivacaine on intracellular Ca2+ in rat ventricular myocytes

ZHU Yi, XU Long-he, ZHANG Hong   

  1. Department of Anesthesiology, Chinese PLA General Hospital, Beijing 100853, China
  • Received:2007-03-13 Revised:2007-08-08 Online:2007-08-26 Published:2020-10-27

摘要: 目的: 运用激光扫描共聚焦显微镜观察不同浓度的布比卡因对KCl 诱导的大鼠心室肌细胞内游离钙离子浓度([Ca2+]i) 的影响, 进而探讨布比卡因心肌抑制作用的可能机制。方法: 培养新生SD 大鼠心室肌细胞, 将培养的心室肌细胞随机分为4 组,分别为对照组(C 组)、10 μmol/L 布比卡因组(B1组)、50 μmol/L 布比卡因组(B2 组)、100 μmol/L 布比卡因组(B3 组) 。各组细胞均用钙荧光指示剂Fluo-3 AM 染色, 运用激光扫描共聚焦显微镜动态观察单个心室肌细胞内钙荧光强度(fluorescent intensity,FI) 的变化。结果: 与对照组比较10 μmol/L 的布比卡因对KCl 诱导的大鼠心室肌细胞内钙FI 变化无明显影响(P>0.05), 50 μmol/L 和100 μmol/L 的布比卡因则明显抑制KCl 诱导的钙离子跨膜内流(P<0.05);抑制程度B3组>B2组(P<0.05) 。结论: 低浓度的布比卡因对KCl 诱导的大鼠心室肌细胞内[Ca2+]i 的变化无明显影响, 高浓度则明显抑制钙离子跨膜内流。布比卡因呈浓度依赖性抑制兴奋收缩耦联时心室肌细胞内游离钙离子内流, 可能是其心肌抑制作用的原因之一。

关键词: 布比卡因, 心室肌细胞, 激光扫描共聚焦显微镜, 细胞内钙离子, Fluo-3

Abstract: AIM: To observe the effects of bupivacaine at different concentrations on intracellular free Ca2+ concentration([Ca2+]i) in isolated rat ventricular myocytes induced by KCl using/Laser scanning confocal microscope(LSCM), and to investigate the mechanism of cardiotoxicity of bupivacaine. METHODS: The cultured ventricular myocytes of newborn rats were divided randomly into 4 groups:the control group (group C), the group of bupivacaine at 10 μmol/L (group B1), the group of bupivacaine at 50 μmol/L (group B2) and the group of bupivacaine at 100 μmol/L (group B3).The fluorescent intensity (FI) of intracellular Ca2+ in single cultured cardiomyocytes of newborn rats loaded with Fluo-3 AM was observed by LSCM in order to compare the effects of bupivacaine at different concentrations on the change of [Ca2+]i induced by KCl. RESULTS: There was no difference in the changes of intracellular Ca2+ FI in rat ventricular myocytes induced by KCl in group B1 compared with those in group C(P>0.05).Intracellular Ca2+ FI in rat ventricular myocytes induced by KCl was inhibited significantly in group B2 and B3 compared with that in group C(P<0.05). CONCLUSION: There is no significant effect of bupivacaine at low concentration on intracellular Ca2+ in rat ventricular myocytes induced by KCl.Bupivacaine at high concentraton could significantly inhibit the effects on [Ca2+]i in rat ventricular myocytes induced by KCl.Bupivacaine could inhibit Ca2+ transsarcolemmal influx in isolated rat ventricular myocytes dosedependently, which may in part explain its negative inotropic effect.

Key words: bupivacaine, ventricular myocytes, laser scanning confocal microscope, intracellular Ca2+, Fluo-3

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