Anomalous expression of chloride transporters in the sclerosed hippocampus of mesial temporal lobe epilepsy patients.

Anomalous expression of chloride transporters in the sclerosed hippocampus of mesial temporal lobe epilepsy patients.
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内侧颞叶癫痫患者硬化海马氯离子转运蛋白的异常表达

DOI:
10.3969/j.issn.1673-5374.2013.06.010
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发表时间:
2013-02-25
影响因子:
6.1
通讯作者:
Zhou L
Zhou L
中科院分区:
医学2区
文献类型:
--
作者:
Cai X;Yang L;Zhou J;Zhu D;Guo Q;Chen Z;Chen S;Zhou L

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Na+-K+-Cl- 协同转运蛋白 1 和 K+-Cl- 协同转运蛋白 2 调节海马细胞内氯离子的水平。这些蛋白质导致的氯离子转运受损被认为与内侧颞叶癫痫的病理生理机制有关。这两种蛋白相对表达的不平衡会导致Cl-稳态崩溃,导致γ-氨基丁酸能抑制的丧失,甚至癫痫样放电。在本研究中,我们利用蛋白质印迹分析和免疫组织化学研究了内侧颞叶癫痫患者硬化海马中 Na+-K+-Cl- 协同转运蛋白 1 和 K+-Cl- 协同转运蛋白 2 的表达。与组织学正常海马相比,硬化海马表现出Na+-K+-Cl-协同转运蛋白1表达增加和K+-Cl-协同转运蛋白2表达减少,特别是在CA2和齿状回中。 Na+-K+-Cl- 协同转运蛋白 1 的变化比 K+-Cl- 协同转运蛋白 2 的变化更为显着。这些实验结果表明,海马硬化中细胞内和细胞外氯之间的平衡可能受到干扰,导致癫痫发作的过度兴奋。 Na+-K+-Cl- 协同转运蛋白 1 表达的变化似乎是主要贡献者。我们的研究可能为患有海马硬化的内侧颞叶癫痫患者的可能治疗提供新的思路。
The Na+-K+-Cl- cotransporter 1 and K+-Cl- cotransporter 2 regulate the levels of intracellular chloride in hippocampal cells. Impaired chloride transport by these proteins is thought to be involved in the pathophysiological mechanisms of mesial temporal lobe epilepsy. Imbalance in the relative expression of these two proteins can lead to a collapse of Cl- homeostasis, resulting in a loss of gamma-aminobutyric acid-ergic inhibition and even epileptiform discharges. In this study, we investigated the expression of Na+-K+-Cl- cotransporter 1 and K+-Cl- cotransporter 2 in the sclerosed hippocampus of patients with mesial temporal lobe epilepsy, using western blot analysis and immunohistochemistry. Compared with the histologically normal hippocampus, the sclerosed hippocampus showed increased Na+-K+-Cl- cotransporter 1 expression and decreased K+-Cl- cotransporter 2 expression, especially in CA2 and the dentate gyrus. The change was more prominent for the Na+-K+-Cl- cotransporter 1 than for the K+-Cl- cotransporter 2. These experimental findings indicate that the balance between intracellular and extracellular chloride may be disturbed in hippocampal sclerosis, contributing to the hyperexcitability underlying epileptic seizures. Changes in Na+-K+-Cl- cotransporter 1 expression seems to be the main contributor. Our study may shed new light on possible therapies for patients with mesial temporal lobe epilepsy with hippocampal sclerosis.
DOI: 10.1093/brain/awh181
发表时间: 2004-07-01
期刊: BRAIN
影响因子: 14.5
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