大鼠脑线粒体NOS及L-Arg转运的生化特性

The biochemical properties of L-arginine/nitric oxide pathway in rat brain mitochondria

曹军  曹军  王蕾  赵保路  陈清棠  齐永芬  唐朝枢 

摘 要:测定分离纯化的大鼠脑线粒体(mitochondria,Mt)L-精氨酸(L-arginine,L-Arg)/一氧化氮合酶(nitricoxidesynthase,NOS)/NO系统,L-Arg转运和NOS的活性。结果显示:正常大鼠脑Mt膜上存在高亲和、低转运、可饱和的L-Arg转运体。最大转运速率Vmax为5.87±0.46nmol/mgpro·min-1,米氏常数Km为7.8±0.56μmol/L。大鼠脑Mt在正常状态下仅有内皮型NOS(eNOS)表达。eNOS的最大活化速率Vmax为2.7±0.30nmol/mgpro·min-1,Km为20.85±3.27μmol/L。Mt生成和释放NO?2随孵育时间延长而增加,60min达峰值。结果提示,正常大鼠Mt膜上存在L-Arg转运体,该转运体与细胞膜上Y+型氨基酸转运体相一致;MtNOS属eNOS.MtL-Arg/NOS/NO系统是细胞NO产生的来源之一。
关键词:线粒体; 一氧化氮; L-精氨酸; 一氧化氮合酶; 脑
分类号:Q731 文献标识码:A

 

基金项目:This work was supported by National Major Basic Research Program (G2000056905).
作者单位:曹军(北京大学第一医院心血管研究所) 
     曹军(宁夏医学院病理生理教研室, 银川 750004) 
     王蕾(北京大学第一医院神经研究中心, 北京 100034) 
     赵保路(中国科学院生物物理研究所, 北京 100101) 
     陈清棠(北京大学第一医院神经研究中心, 北京 100034) 
     齐永芬(北京大学第一医院心血管研究所) 
     唐朝枢(北京大学第一医院心血管研究所) 

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收稿日期:2000年10月27日

修稿日期:2000年12月15日