睡眠剥夺后神经元型一氧化氮合酶表达的变化及醒脑静对其影响

目的观察睡眠剥夺(SD)后神经元型一氧化氮合酶(nNOS)在脑内表达的变化及醒脑静对其表达的影响。方法采用改良多平台SD法建立快速眼动(REM)SD模型(SD组,n=40),进一步分药物干预组(n=20)及非药物干预组(n=20)。SD 1、3、5、7d时利用免疫组化法观察脑组织中nNOS的表达。以未予睡眠剥夺大鼠分别作为空白对照组(n=10)和环境对照组(n=10)。结果睡眠剥夺时间越长,脑组织中nNOS阳性细胞表达数目越多;醒脑静可以相对减少nNOS阳性细胞数目。SD组的阳性反应细胞的面积密度显著高于空白对照组和环境对照组(P<0.01);药物干预组的阳性反应细胞的面积密度较非药物干预组低(P<0.01)。结论REM SD能够导致脑组织中nNOS表达增加,进而其分解产生的一氧化氮增多,对脑神经产生毒性作用。醒脑静可以减少nNOS的表达而表现出一定的神经保护作用。

Changes of expression of neuronal nitric oxide synthase after sleep deprivation and effects of Xingnaojing on them

Objective To investigate the changes of expression of neuronal nitric oxide synthase(nNOS) after sleep deprivation(SD) in rats,and to study the effects of Xingnaojing on them. Methods Rapid eye movement(REM) SD models(SD group,n=40) were established by the modified multiple platform methods.The rats in SD group were subjected to drug intervention group(n=20) and non-drug intervention group(n=20).Xingnaojing injection was administered to the drug intervention group.Rats in SD group were deprived of sleep for 1,3,5 and 7 d. The expression of nNOS in brain tissues was detected by immunohistochemistry.The rats without SD were severed as cage control group(n=10) and tank control group(n=10). Results The expression of positive cells of nNOS in brain tissues increased with the time of SD,and Xingnaojing decreased the number of positive cells of nNOS.The area density of positive reaction cells in SD group was significantly higher than those in cage control group and tank control group(P<0.01).The area density of positive reaction cells in drug intervention group was significantly lower than that in non-drug intervention group(P<0.01). Conclusion REM SD can lead to the increase of nNOS expression,which may result in the increase of nitric oxide,and ultimately bring toxicity effects to neuron cells.Xingnaojing injection exerts cerebral protective effects against REM SD through the mechanism of decreasing nNOS expression.