首页> 外文期刊>American Journal of Physiology >Role of JNK in hypertonic activation of Cl(-)-dependent Na(+)/H(+) exchange in Xenopus oocytes.
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Role of JNK in hypertonic activation of Cl(-)-dependent Na(+)/H(+) exchange in Xenopus oocytes.

机译:JNK在非洲爪蟾卵母细胞中Cl(-)依赖的Na(+)/ H(+)交换的高渗激活中的作用。

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In the course of studying the hypertonicity-activated ion transporters in Xenopus oocytes, we found that activation of endogenous oocyte Na(+)/H(+) exchange activity (xoNHE) by hypertonic shrinkage required Cl(-), with an EC(50) for bath [Cl(-)] of approximately 3mM. This requirement for chloride was not supported by several nonhalide anions and was not shared by xoNHE activated by acid loading. Hypertonicity-activated xoNHE exhibited an unusual rank order of inhibitory potency among amiloride derivatives and was blocked by Cl(-) transport inhibitors. Chelation of intracellular Ca(2+) by injection of EGTA blocked hypertonic activation of xoNHE, although many inhibitors of Ca(2+)-related signaling pathways were without inhibitory effect. Hypertonicity activated oocyte extracellular signal-regulated kinase 1/2 (ERK1/2), but inhibitors of neither ERK1/2 nor p38 prevented hypertonic activation of xoNHE. However, hypertonicity also stimulated a Cl(-)-dependent increase in c-Jun NH(2)-terminal kinase (JNK) activity. Inhibition of JNK activity prevented hypertonic activation of xoNHE but not activation by acid loading. We conclude that hypertonic activation of Na(+)/H(+) exchange in Xenopus oocytes requires Cl(-) and is mediated by activation of JNK.
机译:在研究非洲爪蟾卵母细胞中的高渗活化离子转运蛋白的过程中,我们发现高渗性收缩激活内源性卵母细胞Na(+)/ H(+)交换活性(xoNHE)需要Cl(-),且EC(50) )约3mM的浴液[Cl(-)]。氯的这种要求不受几种非卤化物阴离子的支持,并且被酸负载活化的xoNHE也没有共享。高渗性激活的xoNHE在阿米洛利衍生物中表现出不同寻常的抑制效能等级,并被Cl(-)转运抑制剂所阻断。通过注射EGTA螯合细胞内Ca(2+)可以阻止xoNHE的高渗激活,尽管许多与Ca(2+)相关的​​信号通路抑制剂也没有抑制作用。高渗性激活卵母细胞胞外信号调节激酶1/2(ERK1 / 2),但是ERK1 / 2和p38的抑制剂均不能阻止xoNHE的高渗性激活。但是,高渗也刺激c-Jun NH(2)端激酶(JNK)活性的Cl(-)依赖增加。抑制JNK活性阻止xoNHE的高渗激活,但不能阻止酸加载激活。我们得出结论,爪蟾卵母细胞中Na(+)/ H(+)交换的高渗激活需要Cl(-),并由JNK激活介导。

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