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Calcium signalling during RVD of kidney cells [Review]

机译:肾细胞RVD期间的钙信号传导[综述]

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The balance of a high extracellular osmolarity in the kidney medulla is mainly based on an accumulation of organic osmolytes in the cells. The regulation of cell volume during hypotonic conditions results in a release of organic osmolytes - a process that is partly calcium-dependent, Using calcium-sensitive fluorescent dye and confocal laser scanning microscopy, we have investigated calcium signalling during regulatory volume decrease (RVD) in kidney cells. In rat inner medullary collecting duct (IMCD) cells in primary culture, hypotonic stress induced a calcium release from intracellular stores that preceded calcium entry from the extracellular milieu. Hyposmotic stress had no effect on the cellular IP3 content. Preincubation with 100 mu mol/l ETYA (a non-metabolizible derivative of arachidonic acid), however, reduced the calcium response to hypotonic stress as well as the RVD. Blocker of voltage-dependent calcium channels (verapamil, diltiazem, and nifedipine) in the concentration of 40 mu mol/l reduced partly the calcium response. SKF-96365, an inhibitor of receptor-mediated calcium channels, also attenuated the calcium influx. In conclusion, swelling of IMCD cells increases intracellular calcium by release from intracellular stores and entry across the cell membranes. The signalling involves arachidonic acid metabolism. Copyright (C) 2000 S. Karger AG, Basel. [References: 33]
机译:肾髓质中高细胞渗透压的平衡主要基于细胞中有机渗透物的积累。在低渗条件下细胞体积的调节导致有机渗透物的释放-该过程部分依赖于钙,使用钙敏感荧光染料和共聚焦激光扫描显微镜,我们研究了在调节体积减少(RVD)期间钙的信号传导。肾细胞。在原代培养的大鼠内髓收集管(IMCD)细胞中,低渗应激诱导了钙从细胞内存储区释放出来,而钙从细胞外环境进入之前。低渗应激对细胞IP3含量没有影响。但是,与100μmol / l ETYA(花生四烯酸的不可代谢衍生物)一起预孵育会降低钙对低渗应激以及RVD的反应。浓度为40μmol / l的电压依赖性钙通道(维拉帕米,地尔硫卓和硝苯地平)的阻断剂可部分降低钙的响应。受体介导的钙通道抑制剂SKF-96365也减弱了钙的流入。总之,IMCD细胞的肿胀通过从细胞内储存中释放和进入细胞膜而增加细胞内钙。该信号传导涉及花生四烯酸代谢。版权所有(C)2000 S.Karger AG,巴塞尔。 [参考:33]

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