目的探讨FAM134B介导的内质网自噬在无镁外液致痫海马神经元线粒体钙稳态及凋亡中的作用。方法原代培养新生24 h SD大鼠海马神经元,建立无镁外液诱导的体外癫痫模型,并通过慢病毒载体干预FAM134B表达。将培养10 d的海马神经元随机分为...目的探讨FAM134B介导的内质网自噬在无镁外液致痫海马神经元线粒体钙稳态及凋亡中的作用。方法原代培养新生24 h SD大鼠海马神经元,建立无镁外液诱导的体外癫痫模型,并通过慢病毒载体干预FAM134B表达。将培养10 d的海马神经元随机分为对照组(CON)、无镁诱导组(AE)、空载病毒组(NC)、FAM134B过表达组(Lenti-FAM134B)和FAM134B低表达组(Lenti-FAM134B-shRNA)。采用TUNEL法检测细胞凋亡,钙离子荧光探针Mag-Fluo-AM和Rhod-2分别检测内质网和线粒体钙离子浓度,电镜下观察线粒体超微结构,Western blotting法检测自噬相关蛋白LC3-Ⅱ/Ⅰ、线粒体-内质网结构偶联中IP3R、细胞色素C(CytC)和活化cleaved caspase-3的表达。结果(1)与CON组相比,AE组神经元亡明显增加,FAM134B过表达使无镁外液致痫海马神经元凋亡明显减少,而降低FAM134B表达发挥相反作用;(2)与CON组相比,AE组LC3-Ⅱ/Ⅰ增加,FAM134B过表达显著增加无镁外液致痫海马神经元中LC3-Ⅱ/Ⅰ,而降低FAM134B表达发挥相反作用;(3)与CON组相比,AE组IP3R表达升高,内质网Ca^(2+)浓度降低,线粒体Ca^(2+)浓度升高;FAM134B过表达使无镁外液致痫海马神经元中IP3R表达减低,内质网Ca^(2+)浓度升高,线粒体Ca^(2+)浓度降低,而降低FAM134B表达发挥相反作用;(4)与CON组相比,AE组海马神经元线粒体结构明显损伤,CytC释放和caspase-3活化增加,FAM134B过表达使无镁外液致痫海马神经元线粒体结构损伤明显减轻,CytC释放和caspase-3活化降低,而降低FAM134B表达发挥相反作用。结论FAM134B介导的内质网自噬对无镁外液致痫海马神经元线粒体钙稳态及凋亡发挥保护作用,其机制可能为通过调节线粒体-内质网结构偶联中的IP3R水平改变内质网与线粒体之间的Ca^(2+)交换,减轻线粒体损伤,减少CytC的释放,抑制线粒体凋亡通路的激活。展开更多
Objective To investigate lipopolysaccharide （LPS） induced acute cerebral inflammatory damage and the therapeutic effect of ginkgolide B （BN52021）. Methods Thirty Sprague-Dawley rats were randomly divided into 3 gr...Objective To investigate lipopolysaccharide （LPS） induced acute cerebral inflammatory damage and the therapeutic effect of ginkgolide B （BN52021）. Methods Thirty Sprague-Dawley rats were randomly divided into 3 groups （n = 10 for each group）： Control group, Model group and Treatment group （treated with BN52021）. LPS were injected into the fourth ventricle of rat to make a neuroinflammatory murine model. Morris water maze was used to detect the learning and memory ability of rats; changes of synapse number and subcellular ultrastructures were observed under a transmission electron microscope; OX-42 positive microglia in the brain was detected by immunohistochemical method. Results The average escape latency in the Treatment group were significantly shortened than that in the Model group; and the percentage of swimming distance traveled in platform quadrant accounting for total distance increased markedly. The rough endoplasmic reticulum and polyribosomes in the Treatment group were more than that in the Model group, but the number of synapses seemed to have no obvious change. The number of OX-42 positive microglia in the Treatment group decreased markedly than that in the Model group, and the grey density of OX-42-positive cells increased significantly. Conclusion LPS can induce inflammatory damages to the brain, but the damage could be antagonized by BN52021. Platelet activating factor receptor antagonist may offer an effective therapy for neurodegeneration diseases.展开更多
文摘Objective To investigate lipopolysaccharide （LPS） induced acute cerebral inflammatory damage and the therapeutic effect of ginkgolide B （BN52021）. Methods Thirty Sprague-Dawley rats were randomly divided into 3 groups （n = 10 for each group）： Control group, Model group and Treatment group （treated with BN52021）. LPS were injected into the fourth ventricle of rat to make a neuroinflammatory murine model. Morris water maze was used to detect the learning and memory ability of rats; changes of synapse number and subcellular ultrastructures were observed under a transmission electron microscope; OX-42 positive microglia in the brain was detected by immunohistochemical method. Results The average escape latency in the Treatment group were significantly shortened than that in the Model group; and the percentage of swimming distance traveled in platform quadrant accounting for total distance increased markedly. The rough endoplasmic reticulum and polyribosomes in the Treatment group were more than that in the Model group, but the number of synapses seemed to have no obvious change. The number of OX-42 positive microglia in the Treatment group decreased markedly than that in the Model group, and the grey density of OX-42-positive cells increased significantly. Conclusion LPS can induce inflammatory damages to the brain, but the damage could be antagonized by BN52021. Platelet activating factor receptor antagonist may offer an effective therapy for neurodegeneration diseases.
