首页> 外文期刊>American Journal of Physiology >Requirement for Ca2+ signaling in the mechanism of thrombin-induced increase in endothelial permeability.
【24h】

Requirement for Ca2+ signaling in the mechanism of thrombin-induced increase in endothelial permeability.

机译:凝血酶诱导的内皮通透性增加机制中对Ca2 +信号的需求。

获取原文
获取原文并翻译 | 示例
           

摘要

We compared the thrombin-activated responses in human umbilical vein endothelial cells (HUVECs) and a HUVEC-derived cell line, ECV304. Thrombin induced a 40-50% decrease in transendothelial monolayer electrical resistance and a twofold increase in 125I-albumin permeability in HUVECs, whereas it failed to alter the endothelial barrier function in ECV304 cells. Thrombin produced a brisk intracellular Ca2+ concentration transient and phosphorylation of 20-kDa myosin light chain in HUVECs but not in ECV304 cells. Thrombin-induced phosphoinositide hydrolysis was comparable in ECV304 cells and HUVECs, indicating the activation of thrombin receptors in both cell types. La3+ reduced both the thrombin-induced decrease in endothelial monolayer electrical resistance and the increase in 125I-albumin permeability in HUVECs. Because the absence of Ca2+ signaling could explain the impairment in the permeability response in ECV304 cells, we studied the effect of increasing intracellular Ca2+ concentration in ECV304 cells with thapsigargin. Exposure of ECV304 cells to thapsigargin caused decreased endothelial monolayer electrical resistance and increased 125I-albumin permeability. These results indicate that Ca2+ influx and activation of Ca2+-dependent signaling pathways are important determinants of the thrombin-induced increase in endothelial permeability.
机译:我们比较了人脐静脉内皮细胞(HUVEC)和HUVEC衍生的细胞系ECV304中的凝血酶激活反应。凝血酶诱导HUVECs的跨内皮单层电阻降低40-50%,并使125I-白蛋白通透性增加两倍,而凝血酶未能改变ECV304细胞的内皮屏障功能。凝血酶在HUVEC中产生了轻快的细胞内Ca2 +浓度瞬变和20 kDa肌球蛋白轻链磷酸化,但在ECV304细胞中却没有。凝血酶诱导的磷酸肌醇水解在ECV304细胞和HUVEC中具有可比性,表明两种细胞类型中凝血酶受体的激活。 La3 +既减少了凝血酶诱导的内皮单层电阻的降低,又降低了HUVEC中125 I-白蛋白通透性的增加。因为缺少Ca2 +信号传导可以解释ECV304细胞通透性反应的损害,所以我们研究了使用毒胡萝卜素增加ECV304细胞中细胞内Ca2 +浓度的作用。 ECV304细胞暴露于毒胡萝卜素可导致内皮单层电阻降低,并增加125I-白蛋白通透性。这些结果表明,Ca2 +的大量涌入和依赖Ca2 +的信号通路的激活是凝血酶诱导的内皮通透性增加的重要决定因素。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号