Effects of free radicals and amyloid β protein on the currents of expressed rat receptors in Xenopus oocytes

被引:0
|
作者
黄福南 [1 ]
李文彬 [1 ]
张炳烈 [1 ]
崔旭 [1 ]
韩志涛 [1 ]
房征宇 [1 ]
蔡竖平 [1 ]
尹岭 [1 ]
王鲁宁 [1 ]
机构
[1] 解放军总医院老年医学研究所神经生物学与神经疾病实验室!北京100853
关键词
淀粉样β蛋白·自由基·神经递质·受体·谷氨酸·阿尔茨海默病;
D O I
暂无
中图分类号
R321 [人体胚胎学(人体胎生学、发生学)];
学科分类号
071008 ;
摘要
目的 探讨淀粉样 β蛋白 (Aβ1 4 0 )和自由基对爪蟾卵母细胞表达的大鼠脑谷氨酸受体功能的影响。方法 采用Promega试剂盒提取 3月龄大鼠脑组织mRNA ,并将 50nl (50ng)的mRNA显微注射到成熟的每个爪蟾卵母细胞进行受体表达。表达的受体激活电流采用双电极电压钳位技术记录。超氧阴离子自由基 (SAFRs)和Aβ1 4 0 等在记录前的 12h、2 4h、96h分别加入孵育液。结果 注射到爪蟾卵母细胞的鼠脑mRNA可以表达出M型ACh、谷氨酸等受体 ,这些受体的激活电流特征是由氯离子载流的内向电流。Aβ1 4 0 对表达的谷氨酸受体有抑制效应 ,其程度依作用时间和浓度不同而不同。 2 0nmol/LAβ1 4 0 作用 2 4小时对表达的谷氨酸受体功能无影响 ,SAFRs共孵育时 2 0nmol/LAβ1 4 0 作用 12小时即对表达的谷氨酸受体功能有明显影响。与SAFRs共同孵育时 6 0nmol/LAβ1 4 0 作用 12小时即对表达的谷氨酸受体有明显抑制效应 (降低 2 1% ,P <0 0 5) ,而作用 2 4小时时下降达 52 %。维生素E对这些效应有拮抗作用。结论 自由基和Aβ对谷氨酸受体具有抑制效应 ,该效应能被维生素E拮抗。Aβ可通过抑制受体功能在阿尔茨海默病发病机理中起作用
引用
收藏
页码:20 / 23+103
页数:5
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