The Na＋-K＋-CI- cotransporter 1 and K＋-CI- cotransporter 2 regulate the levels of intracellular chloride in hippocampal cells. Impaired chloride transport by these proteins is thought to be involved in the pathophys...The Na＋-K＋-CI- cotransporter 1 and K＋-CI- 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 CI- 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＋-CI- cotransporter 1 and K＋-CI- 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＋-CI- cotransporter 2 expression, especially in CA2 and the dentate gyrus. The change was more prominent for the Na＋-K＋-CI- cotransporter 1 than for the K＋-CI- 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＋-CI-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.展开更多
目的探讨神经元细胞KCC2、NKCC1及4E-BP1在外伤性癫痫致痫灶中的表达及其临床意义。方法选择2017年1月-2019年6月本院接诊外伤性癫痫患者37例纳入研究组,经手术切除癫痫致癫灶;同期,另选择于单纯脑外伤患者40例纳入对照组,分别于脑外伤...目的探讨神经元细胞KCC2、NKCC1及4E-BP1在外伤性癫痫致痫灶中的表达及其临床意义。方法选择2017年1月-2019年6月本院接诊外伤性癫痫患者37例纳入研究组,经手术切除癫痫致癫灶;同期,另选择于单纯脑外伤患者40例纳入对照组,分别于脑外伤后6 h内手术获取脑组织样本。通过蛋白质印迹法测定外伤性癫痫致癫灶中KCC2、NKCC1、4E-BP1表达,并利用RT-PCR法测定外伤性癫痫致癫灶中KCC2 m RNA、NKCC1 m RNA、4E-BP1m RNA相对表达量。结果蛋白质印迹法检测显示:研究组患者的神经元细胞KCC2相对灰度值低于对照组,差异有统计学意义(P <0.05);研究组患者的神经元细胞NKCC1、4E-BP1相对灰度值均高于对照组,差异有统计学意义(P <0.05);RT-PCR检测显示:研究组患者的致癫灶中KCC2 m RNA相对表达量低于对照组,差异有统计学意义(P <0.05);研究组患者的致癫灶中NKCC1 m RNA、4E-BP1 m RNA相对表达量均高于对照组,差异有统计学意义(P <0.05)。结论神经元细胞KCC2、NKCC1及4E-BP1为脑外伤后患者脑组织的组织学改变、癫痫反复发作主要分子机制;KCC2在外伤性癫痫致癫灶中表达异常降低,而神经元细胞NKCC1、4E-BP1的表达异常增高,可以作为外伤性癫痫致痫灶靶向诊断因子。展开更多
基金supported by the Science and Technology Foundation of Guangdong Province,No.2008B060600063the National Natural Science Foundation of China,No. 81071050the Natural Science Foundation of Guangdong Province,No. S2011020005483
文摘The Na＋-K＋-CI- cotransporter 1 and K＋-CI- 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 CI- 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＋-CI- cotransporter 1 and K＋-CI- 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＋-CI- cotransporter 2 expression, especially in CA2 and the dentate gyrus. The change was more prominent for the Na＋-K＋-CI- cotransporter 1 than for the K＋-CI- 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＋-CI-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.
文摘目的探讨神经元细胞KCC2、NKCC1及4E-BP1在外伤性癫痫致痫灶中的表达及其临床意义。方法选择2017年1月-2019年6月本院接诊外伤性癫痫患者37例纳入研究组,经手术切除癫痫致癫灶;同期,另选择于单纯脑外伤患者40例纳入对照组,分别于脑外伤后6 h内手术获取脑组织样本。通过蛋白质印迹法测定外伤性癫痫致癫灶中KCC2、NKCC1、4E-BP1表达,并利用RT-PCR法测定外伤性癫痫致癫灶中KCC2 m RNA、NKCC1 m RNA、4E-BP1m RNA相对表达量。结果蛋白质印迹法检测显示:研究组患者的神经元细胞KCC2相对灰度值低于对照组,差异有统计学意义(P <0.05);研究组患者的神经元细胞NKCC1、4E-BP1相对灰度值均高于对照组,差异有统计学意义(P <0.05);RT-PCR检测显示:研究组患者的致癫灶中KCC2 m RNA相对表达量低于对照组,差异有统计学意义(P <0.05);研究组患者的致癫灶中NKCC1 m RNA、4E-BP1 m RNA相对表达量均高于对照组,差异有统计学意义(P <0.05)。结论神经元细胞KCC2、NKCC1及4E-BP1为脑外伤后患者脑组织的组织学改变、癫痫反复发作主要分子机制;KCC2在外伤性癫痫致癫灶中表达异常降低,而神经元细胞NKCC1、4E-BP1的表达异常增高,可以作为外伤性癫痫致痫灶靶向诊断因子。
