Calcium adaptation to sodium pump inhibition in a human megakaryocytic cell line.

Calcium adaptation to sodium pump inhibition in a human megakaryocytic cell line.
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人类巨核细胞系中钙对钠泵抑制的适应。

DOI:
10.1152/ajpcell.00080.2005
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发表时间:
2005
期刊:
American journal of physiology. Cell physiology
影响因子:
--
通讯作者:
Aviv,Abraham
Aviv,Abraham
中科院分区:
--
文献类型:
--
作者:
Kimura,Masayuki;Cao,Xiaojian;Aviv,Abraham

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血小板Na/Ca交换剂的独特特性,即,它依赖于跨膜Na和K梯度,使其对Na泵抑制高度敏感。在本项目中,我们观察到人巨核细胞系CHRF-288同时表达Na-K-ATP酶的α1和α3亚型。抑制Na泵可增加肌浆网Ca-ATPase 2b的RNA和蛋白质表达、胞浆Na和Ca以及内质网中自由交换的Ca。这些变化发生在音乐会与减少存储操作的钙进入和增加的Na/Ca交换器的最大活性。哇巴因抑制钠泵比减少介质钾更有效地诱导这些变化。总的来说,这些观察结果指向一个综合性的努力,以抵消钠泵抑制的影响,钙螯合到内质网,减少钙进入,并增加活性的Na/Ca交换。这些研究结果在血小板生物学的影响进行了讨论。
The unique characteristics of the platelet Na/Ca exchanger, i.e., its dependence on both transmembrane Na and K gradients, render it highly sensitive to Na pump inhibition. In this project, we observed that the human megakaryocytic cell line CHRF-288 expresses both the α1- and α3-isoforms of the Na-K-ATPase. Inhibition of the Na pump increased the RNA and protein expressions of sarco(endo)plasmic reticulum Ca-ATPase 2b, cytosolic Na and Ca, and the freely exchangeable Ca in the endoplasmic reticulum. These changes occurred in concert with diminished store-operated Ca entry and an increase in the maximal activity of the Na/Ca exchanger. Inhibition of the Na pump by ouabain was more effective in inducing these changes than diminishing medium K. Collectively, these observations point to an integrative effort to counteract the impact of Na pump inhibition by Ca sequestration into the endoplasmic reticulum, diminished Ca entry, and increased activity of the Na/Ca exchanger. The implications of these findings in platelet biology are discussed.
内源性哇巴因、钠平衡和血压。
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