摘要
目的 研究睡眠调节中枢下丘脑腹外侧视前区(VLPO)与觉醒调节关键区域结节乳头体核(TMN)之间的联系在大鼠睡眠-觉醒周期调控中的作用.方法 将雄性SD大鼠随机分为对照组(TMN+ACSF&VLPO+ ACSF组)与实验组(TMN+ ACSF&VLPO+ L-Glu组,TMN+ Bic&VLPO+ ACSF组,TMN+Bic&VLPO+L-Glu组),采用脑立体定位技术确定大鼠VLPO以及TMN插管位置并进行核团内微量注射和多导睡眠描记技术等方法观察和记录大鼠睡眠的变化.结果 与TMN+ACSF&VLPO+ACSF组(n=8)相比,TMN+ACSF&VLPO+L-Glu组(n=7)VLPO内微量注射L-谷氨酸(L-Glu)可使大鼠觉醒减少(42.30±3.75,P<0.01),非快动眼睡眠(NREM)和总睡眠时间(TST)增多(61.97±3.41,P<0.01;77.68±3.74,P<0.01),快动眼睡眠(REM)无明显改变,差异无统计学意义;与TMN+ACSF&VLPO+L-Glu组(n=7)相比,TMN+Bic&VLPO+L-Glu组(n=8)中荷包牡丹碱(Bicuculline,Bic)和L-Glu相继分别微量注射于TMN和VLPO后,大鼠觉醒增加(79.22±3.93,P<0.01),NREM(34.82±3.23,P<0.01)和REM(5.97± 1.10,P<0.05)以及TST(40.79±3.92,P<0.01)减少,即TMN注射Bic可拮抗L-Glu在VLPO引起的促睡眠作用.结论 VLPO可通过GABAA受体抑制TMN神经元活动而产生促睡眠作用.
Objective To investigate the effects of relationship between ventrolateral preoptic nucleus (VLPO) and tuberomammillary nucleus (TMN) on the regulation of sleep-wake cycle in rats.Methods SD male rats were randomly divided into control group (TMN +ACSF&VLPO+ACSF) and experimental groups (TMN+ ACSF&VLPO+L-Glu,TMN+Bic & VLPO+ACSF,TMN+Bic&VLPO+L-Glu).Brain stereotaxic technique,microinjection and polysomnography were used to detect and record the variation of rat sleep.Results Compared with the TMN+ACSF&VLPO+ACSF group (n=8),the amount of wakefulness declined (42.30±3.75,P<0.01) along with the enhancement of non-rapid eye movement (NREM) sleep (61.97±3.41,P<0.01) and total sleep time (TST) (77.68±3.74,P<0.01) after L-Glu microinjected into VLPO (n=7),while there was no significant change in rapid eye movement (REM) sleep.Compared to those of L-Glu microinjected into VLPO alone in the TMN +ACSF&VLPO+L-Glu group (n=7),the wakefulness increased (79.22±3.93,P<0.01),meanwhile,NREM sleep (34.82±3.23,P<0.01),REM sleep (5.97± 1.10,P<0.05) and TST (40.79±3.92,P<0.01) decrease after L-Glu microinjected into VLPO followed by the Bic microinjected into TMN (n=8).Conclusion VLPO can inhibit the neuronal activity of TMN via GABAA receptor and induce the sleep-promoting effect.
出处
《中华行为医学与脑科学杂志》
CAS
CSCD
北大核心
2014年第2期97-100,共4页
Chinese Journal of Behavioral Medicine and Brain Science
基金
国家自然科学基金资助项目(81071075)
教育部博士点基金新教师类(20093420120004)
安徽医科大学校科研基金(2013xkj002,2013xkj005)
关键词
腹外侧视前区
结节乳头体核
荷包牡丹碱
睡眠
觉醒
Ventrolateral preoptic nucleus
Tuberomammillary nucleus
Bicuculline
Sleep
Wakefulness