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
目的建立测定氨酪酸氯化钠注射液中氨酪酸的HPLCJY法。方法采用CAPCELL PAK C18柱,流动相:以磷酸二氢钾溶液(取磷酸二氢钾10.0g与己烷磺酸钠1.1g,加水溶解并稀释至1000mL,磷酸调节pH2.1)-甲醇(90:10)为流动相;流速1.0mL/...目的建立测定氨酪酸氯化钠注射液中氨酪酸的HPLCJY法。方法采用CAPCELL PAK C18柱,流动相:以磷酸二氢钾溶液(取磷酸二氢钾10.0g与己烷磺酸钠1.1g,加水溶解并稀释至1000mL,磷酸调节pH2.1)-甲醇(90:10)为流动相;流速1.0mL/min,检测波长210nm,柱温30℃,进样量10μL。结果氨酪酸在0.08~1.6mg/mL范围内线性关系良好(r=0.9999),平均回收率99.89%(RSD=0.25%,n=6)。结论该方法准确、简便、快速,适用于测定氨酪酸氯化钠注射液中氨酪酸的含量。展开更多
目的建立高效液相色谱法检测氨酪酸氯化钠注射液中α-吡咯烷酮含量的方法标准。方法选用CAPCELL PAK C18柱为色谱柱;流动相采用p H2.1的磷酸二氢钾溶液-甲醇(90:10);流速维持在1.0m L/min;紫外检测波长设定为210nm;柱温为30℃;进样量...目的建立高效液相色谱法检测氨酪酸氯化钠注射液中α-吡咯烷酮含量的方法标准。方法选用CAPCELL PAK C18柱为色谱柱;流动相采用p H2.1的磷酸二氢钾溶液-甲醇(90:10);流速维持在1.0m L/min;紫外检测波长设定为210nm;柱温为30℃;进样量为10μL。结果α-吡咯烷酮浓度为0.4-5.0mg/L时其线性关系良好,r=0.9998,平均回收率为100.27%(RSD=0.54%,n=6)。结论本研究建立的HPLC法对于氨酪酸氯化钠注射液中的α-吡咯烷酮测定效果良好且方便快捷。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.
文摘目的建立测定氨酪酸氯化钠注射液中氨酪酸的HPLCJY法。方法采用CAPCELL PAK C18柱,流动相:以磷酸二氢钾溶液(取磷酸二氢钾10.0g与己烷磺酸钠1.1g,加水溶解并稀释至1000mL,磷酸调节pH2.1)-甲醇(90:10)为流动相;流速1.0mL/min,检测波长210nm,柱温30℃,进样量10μL。结果氨酪酸在0.08~1.6mg/mL范围内线性关系良好(r=0.9999),平均回收率99.89%(RSD=0.25%,n=6)。结论该方法准确、简便、快速,适用于测定氨酪酸氯化钠注射液中氨酪酸的含量。
文摘目的建立高效液相色谱法检测氨酪酸氯化钠注射液中α-吡咯烷酮含量的方法标准。方法选用CAPCELL PAK C18柱为色谱柱;流动相采用p H2.1的磷酸二氢钾溶液-甲醇(90:10);流速维持在1.0m L/min;紫外检测波长设定为210nm;柱温为30℃;进样量为10μL。结果α-吡咯烷酮浓度为0.4-5.0mg/L时其线性关系良好,r=0.9998,平均回收率为100.27%(RSD=0.54%,n=6)。结论本研究建立的HPLC法对于氨酪酸氯化钠注射液中的α-吡咯烷酮测定效果良好且方便快捷。