树鼩脑缺血时神经元线粒体渗透性转导孔开放对线粒体呼吸的影响

被引:6
作者
张颖
李树清
刘跃
机构
[1] 昆明医学院病理生理教研室
[2] 昆明医学院病理生理教研室 云南昆明650031
关键词
脑缺血; 线粒体呼吸; 渗透性转导孔; 银杏内酯B; 树鼩科; 环孢菌素;
D O I
暂无
中图分类号
R741 [神经病学];
学科分类号
1002 ;
摘要
目的 :揭示光化学诱导树鼠句脑缺血后不同时间内 ,缺血神经元线粒体呼吸功能的变化 ,观察血小板活化因子 (PAF)受体拮抗剂银杏内酯B(GB)和免疫抑制剂环孢菌素A (CsA)对线粒体呼吸及神经元线粒体渗透性转导孔 (MPT)开放的影响 ,探讨二者可能的神经保护机制及缺血时MPT开放与线粒体呼吸的相互关系。方法 :建立光化学诱导树鼠句脑缺血模型 ,分离缺血后 4、2 4、72h大脑皮层线粒体 ,用氧电极极谱法测定线粒体呼吸。于缺血 6h分别注射GB和CsA ,2 4h时观察相关指标。另取分离的线粒体 ,用CaCl2 诱导MPT开放 ,再分别加入CsA或GB ,观察其对线粒体肿胀的影响。结果 :缺血脑皮层神经元线粒体Ⅲ态呼吸速度、呼吸控制率 (RCR)及磷氧比 (P/O)逐渐下降 ,以缺血 2 4h的变化为著 ,与假手术组相比均有显著差异 (P <0 0 1)。给予GB或CsA ,Ⅲ态呼吸速度显著大于对照组(P <0 0 1) ,P/O比上升 (P <0 0 5)。CaCl2 可诱导MPT开放 ,线粒体肿胀而透光率迅速下降 ,CsA有效阻滞了MPT开放 ,GB则不然。结论 :光化学诱导树鼠句局灶脑缺血后 ,缺血皮层线粒体呼吸明显障碍 ,GB或CsA可不同程度地改善缺血神经元线粒体代谢 ,可能与GB拮抗神经细胞膜上PAF受体活化 ,间接调节线粒体呼吸有关 ;而CsA主要通过抑制MPT开放而改善线粒体呼吸而?
引用
收藏
页码:121 / 125
页数:5
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