氯通道参与脑血管平滑肌细胞Ca2+池操纵性Ca2+内流
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国家自然科学基金 (3 9970 849);国家科技部攀登计划(国科基字 [1999] 0 45号 );2 0 0 0年广东省自然科学基金团队项目资助


Chloride Channels Participated in Cerebrovascular Smooth Muscle Cells Ca~( 2+) Store-operated Ca~ 2+ Influx
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    摘要:

    研究Cl-通道在牛脑血管平滑肌细胞Ca2+池操纵性Ca2+内流中的作用。采用培养的脑血管平滑肌细胞,在生物荧光双波长影像分析系统用Fura2Am荧光探针测定单个细胞内游离Ca2+浓度。结果发现:①Cl-通道阻断剂DIDS(0.75μmolL)能降低内皮素1(10-7molL)刺激引起的脑血管平滑肌细胞Ca2+内流,抑制率为29.6%±3.9%,随后加入Cl-通道阻断剂NPPB(10μmolL)能继续降低平台相,抑制率为44.9%±8.7%;交换加药顺序,NPPB能降低内皮素1刺激引起的Ca2+内流,DIDS能进一步降低Ca2+内流。②DIDS(0.75μmolL)能降低三磷酸腺苷(10μmolL)刺激引起的脑血管平滑肌细胞Ca2+内流,抑制率为26.7%±10.5%,随后加入NPPB(10μmolL)能继续降低平台相,抑制率为54.3%±9.6%;交换加药顺序,NPPB能降低三磷酸腺苷刺激引起的Ca2+内流,DIDS能进一步降低Ca2+内流。③DIDS(0.75μmolL)能降低环匹阿尼酸(10μmolL)刺激引起的脑血管平滑肌细胞Ca2+内流,抑制率为26.5%±5.0%,随后加入NPPB(10μmolL)能继续降低平台相,抑制率为46.1%±4.2%;交换加药顺序,NPPB能降低环匹阿尼酸刺激引起的Ca2+内流,DIDS能进一步降低Ca2+内流。提示对DIDS、NPPB敏感的非同一性Cl-通道参与内皮素1、三磷酸腺苷、环匹阿尼酸触发的脑血管平滑肌细胞Ca2+池操纵性Ca2+内流。

    Abstract:

    Aim To study the effects of chloride channels on cultured bovine cerebrovascular smooth muscle cells (CSMC) Ca 2+ store operated Ca 2+ influx. Method Cell culture and single intracellular free Ca 2+ concentration was measured in Fura 2/Am flueorescence probed by MetaFluor Fluorescence Ratio Imaging System. Results ① Chloride channel inhibitors 4,4' diisothiocyanostibene 2,2' disulphhonate (DIDS,0.75 μmol/L) decreased Ca 2+ influx significantly induced by endothelin 1 (ET 1),adenosine triphosphate (ATP),cyclopiazonic acid (CPA);Subsequent addition 5 nitro 2 (3 phenylpropylamino) benzoate (NPPB,10 μmol/L) further produced the decrease effect. ② NPPB (10 μmol/L) decreased Ca 2+ influx significantly induced by ET 1,ATP,CPA;Subsequent addition DIDS (0.75 μmol/L) also further produced the effect of decreasing. Conclusion Chloride channel inhibitors DIDS, NPPB inhibited Ca 2+ store operated Ca 2+ influx induced by ET 1, ATP, CPA. DIDS,NPPB sensitive chloride channels participated in the signal transduction of Ca 2+ store operated Ca 2+ influx in cerebrovascular smooth muscle cells.

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陈临溪,关永源,贺华,丁岩,熊大志.氯通道参与脑血管平滑肌细胞Ca2+池操纵性Ca2+内流[J].中国动脉硬化杂志,2002,10(5):369~374.

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  • 收稿日期:2002-04-11
  • 最后修改日期:2002-09-25
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