线粒体一氧化氮合酶的研究进展

Nitric oxide (NO) is an intra- and intercellular messenger with a broad spectrum of activities in the central nervous system, cardiovascular and immune systems. Mitochondrial nitric oxide synthase(mtNOS), which might be a new form of NOS in mitochondria, has been discovered to be active in the regulation of mitochondrial respiration, energy metabolism and many pathophysiological processes. In this review, the location, properties, physiological and pathophysiological significance of mtNOS were summarized.

诱导型一氧化氮合酶在大鼠肾脏缺血预处理第二窗的保护作用

目的:观察肾脏缺血预处理对缺血/再灌注损伤的第二窗保护作用,探讨诱导型一氧化氮合酶(iNOS)的作用机制。方法:对大鼠肾动脉进行4次循环的5min夹闭/5min放开造成缺血预处理,24h后进行45min夹闭/24h放开造成缺血/再灌注损伤模型。观察缺血预处理后缺血/再灌注的大鼠血清肌苷、尿素氮变化,Paller法评分观察肾组织损伤情况;检测缺血预处理后血清一氧化氮(NO)及肾组织iNOS活性的变化。结果:缺血预处理能显著降低缺血/再灌注损伤时血清肌苷、尿素氮水平,减轻肾组织损伤程度;氨基胍能阻断缺血预处理的第二窗保护作用;缺血预处理后24h血清NO及肾组织iNOS活性升高。结论:缺血预处理对缺血/再灌注损伤有第二窗保护作用,此作用可能与缺血预处理后iNOS活性升高生成的NO有关。