猫背外侧脑桥中脑被盖区神经细胞损毁对睡眠-觉醒状态的影响

Effects of damage in cat dorsolateral pontomesencephalic tegmentum on sleep-waking states

目的:损毁猫背外侧脑桥中脑被盖区神经细胞,观察其对睡眠-觉醒状态的影响。方法:采用红藻氨酸(KA)微量注射入猫(6只)双侧背外侧脑桥中脑被盖区(每侧6μg),损毁该区域。通过脑电活动和肌电活动测量损毁前后动物的觉醒-睡眠状态,统计损毁前后各时相数据占每次睡眠描记时间的百分比、每次睡眠描记的快眼动(REM)睡眠次数及每次REM睡眠时间。结果:损毁后觉醒时间的百分比从损毁前的(14.68±1.37)%增加到(20.78±3.37)%(t=-1.350,P=0.235);慢波睡眠时间从(65.07±2.73)%减少到(64.65±4.35)%(t=0.089,P=0.932);REM睡眠时间从(20.26±2.74)%减少到(13.65±2.25)%(t=3.843,P=0.012);REM睡眠次数从损毁前的(12.2±1.6)次/6h减少到(10.0±1.4)次/6h(t=1.976,P=0.119);REM睡眠时间从(6.3±0.6)min/次减少到(5.5±0.5)min/次(t=0.939,P=0.401)。有4只动物在双侧背外侧脑桥中脑被盖区神经细胞损毁后的REM睡眠过程中仍维持一定的肌张力,而在正常睡眠描记过程中肌张力完全消失,只出现时相性的肌肉颤搐。损毁部位的组织学观察显示距损毁部位1～2mm内的神经细胞消失,损毁区域的神经纤维破坏不明显。结论:背外侧脑桥中脑被盖区的神经细胞在REM睡眠的维持及其伴随的颈肌迟缓的产生中起重要作用。

Aim:To investigate the effects of damage in cat dorsolateral pontomesencephalic tegmentum on sleep-waking states.Methods:Kainic acid(KA)were injected bilaterally(6 μg each side)into the dorsolateral pontomesencephalic tegmentum to destroy these areas in 6 cats.Sleep-waking states were measured by electroencephalogram and electromyogram before and after KA injection to compare the percentage changes of every state in each recording time,changes in REM times and REM duration.Results:The percentage of the waki...