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中国临床药理学与治疗学 ›› 2017, Vol. 22 ›› Issue (6): 606-610.

• 基础研究 • 上一篇    下一篇

映山红花总黄酮对大鼠神经元及EA.hy926内皮细胞超极化作用及机制

张 洁,陈志武   

  1. 安徽医科大学药理学教研室,合肥 230032,安徽
  • 收稿日期:2017-03-31 修回日期:2017-05-10 出版日期:2017-06-26 发布日期:2017-06-26
  • 通讯作者: 陈志武,男,教授,博士生导师,研究方向: 心脑血管药理学。 Tel: 0551-65161133 E-mail: chpharmzw@163.com
  • 作者简介:张洁,女,硕士研究生,研究方向: 心脑血管药理学。 Tel: 15856958513 E-mail: janezhang93@126.com
  • 基金资助:

    国家自然科学基金项目(81374002,81173596)

Effect and mechanism of total flavones of rhododendra on membrane hyperpolarization in rat hippocampal neurons and EA.hy926 cells

ZHANG Jie, CHEN Zhiwu   

  1. Department of Pharmacology,Anhui Medical University,Hefei  230032,Anhui,China
  • Received:2017-03-31 Revised:2017-05-10 Online:2017-06-26 Published:2017-06-26

摘要:

目的: 观察映山红花总黄酮(total flavones of rhododendra,TFR)对大鼠海马神经元及EA.hy926内皮细胞膜超极化作用及机制研究。方法: 体外培养大鼠海马神经元和EA.hy926内皮细胞,利用DiBAC4(3)荧光染料在钙离子成像系统488 nm激发波长下检测EA.hy926和大鼠海马神经元荧光强度变化以反映膜电位改变情况。结果: 与Control组比较,TFR(270 mg/L)和TFR(810 mg/L)能显著降低EA.hy926内皮细胞内荧光强度,即细胞发生了超极化现象,且BKCa特异性阻断剂IbTX及联用IKCa阻断剂ChTX和SKCa阻断剂apamin均能抑制TFR(270 mg/L)引起的荧光强度降低现象,而内源性硫化氢(hydrogen sulphide,H2S)合成酶抑制剂DL-炔丙基甘氨酸(DL-propargylglycine,PPG)对这一超极化效应无显著影响;与Control组比较,TFR(270 mg/L)和TFR(810 mg/L)也能显著降低大鼠海马神经元荧光强度,且IbTX能抑制TFR(270 mg/L)引起的荧光强度降低现象。结论: TFR可引起大鼠海马神经元和EA.hy926细胞膜超极化,其作用机制可能与激活细胞膜上钙激活钾通道(Ca2+-sensitive K+ channels,KCa)有关。

关键词: 映山红花总黄酮, 内皮细胞, 海马神经元, 钙激活钾离子通道, 细胞膜电位

Abstract:

AIM: To observe the effect and mechanism of total flavones of rhododendra (TFR) on membrane hyperpolarization in rat hippocampal neurons and EA.hy926 vascular endothelial cells.  METHODS: Rat hippocampal neurons and EA.hy926 cells were cultured in vitro; the changes in fluorescence intensity of endothelial cells and rat neurons were measured by DiBAC4(3) fluorescent dyes through the calcium ion imaging system with the excitation wavelength of 488 nm to reflect the membrane potential.RESULTS:Compared with control group, TFR (270 mg/L and 810 mg/L) could markedly reduce intensity of fluorescence in EA.hy926 cells, and the effect could be inhibited by BKCa specific inhibitor IbTX, the co-application of IKCa inhibitor ChTX and SKCa inhibitor apamin, while DL-propargylglycine(PPG) couldn't;Compared with Control group, TFR (270 mg/L and 810 mg/L) could obviously reduce the intensity of fluorescence in rat hippocampal neurons and this effect could also be blocked by IbTX.CONCLUSION: TFR can cause membrane hyperpolarization in EA.hy926 cells and rat hippocampal neurons; the possible mechanism is related to activating KCa channels.

Key words: total flavones of rhododendra, endothelial cells, hippocampal neurons, Ca 2+ -sensitive K+ channels, cell membrane potential

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