马桑内酯对大鼠海马神经元细胞内游离钙离子浓度的影响

Effects of Coriaria Lactone on the Concentration of Intracellular Free Calcium of Rat Hippocampal Neurons

以荧光探针Fluo-3/AM为胞浆内游离钙特异性指示剂,通过激光扫描共聚焦显微镜动态监测急性分离SD大鼠(出生后7~14d)海马神经元细胞内游离钙离子浓度([Ca2+]i)的变化情况,以了解钙离子及钙通道在癫痫发病中的作用,探讨马桑内酯(coriaria lactone,CL)调节神经细胞内钙稳态的机理。实验发现,CL能使急性分离大鼠海马神经元[Ca2+]i增加;nifedipine和低浓度NiCl2虽可延迟,但不能完全阻断这种作用。除促使电压依赖的T-、L-型钙离子通道开放外,CL尚可通过其他途径增加海马神经元内[Ca2+]i,改变细胞兴奋性而致痫。

We instituted an investigation to elucidate the role of Ca2+ and calcium channels in epileptogenesis and to analyze the mechanism by which coriaria lactone(CL) regulates intracellular Ca2+ concentration. The hippocampal neurons of Sprague-Dawley rats (post natal days 7 to 14) were acutely isolated and loaded with calcium-sensitive fluorescent indicator Fluo-3/AM. Intracellular calcium concentration ([Ca2+]i) changes were measured using laser scanning confocal microscopy. The study included five groups, name...