人参皂甙对大鼠睡眠结构和皮质脑电功率谱的作用

目的 研究人参皂甙(GS)调节自发睡眠结构和皮质脑电功率谱的作用.方法 SD大鼠24只随机分为对照、低(GS 10mg/kg)和高剂量(100mg/kg)组,每组8只.大鼠体内植入无线发射器,手术后按10和100mg/kgGS或蒸馏水给大鼠灌胃,每日1次共6天.在给药第1和6天记录自由活动大鼠脑电(EEG)活动12 h.结果 GS灌胃第1天,仅高剂量增加了总睡眠和非快动眼睡眠(NREM)而减少觉醒(9.40±0.88)h,(8.00±1.21)h,(2.46±0.81)hs(7.55±1.59)h,(6.36±1.54)h,(4.38±1.62)h,(P＜0.05或P＜0.01)];低、高剂量GS增强了NREM和觉醒δ波功率(P＜0.05),但减少觉醒θ波功率(P＜0.01)以及NREM、REM睡眠和觉醒波功率(P＜0.01),低、高剂量GS分别降低REM和NREM的θ波功率(P＜0.05).灌胃第6天,低、高剂量GS显著增加总睡眠(P＜0.05)和NREM(P＜0.05),降低觉醒(P＜0.05)和睡眠/觉醒周期(P＜0.05);低、高剂量GS增强NREM和觉醒δ波功率(P＜0.05),减少觉醒θ波功率(P＜0.05)以及NREM、NEM睡眠和觉醒波功率(P＜0.05),低剂量GS还降低NREM睡眠θ波功率(P＜0.01).结论 GS能时间依赖性调节大鼠自发睡眠结构,以及具有广泛调节皮层脑电功率谱的作用.

Actions of ginsenosides on sleep architecture and cortical electroencephalogram power spectrum in rats

Objective To study the effects of ginsenosides (GS) on spontaneous sleep architecture and Cortical EEG power spectrum. Methods 24 adult SD rats were randomly divided into the control, GS 10 and 100mg/kg groups ( n = 8). Rats were instrumented with sleep-wake recording electrodes. After recovery from surgical operation,rats were orally administered GS 10 and 100mg/kg or distilled water once per day for 6 days. On GS administration day 1 and 6,Polygraphic signs of undisturbed sleep-wake activities were recorded for 12 h after GS administration. Results On GS administration day 1 ,only 100mg/kg GS increased significantly total sleep and the non-rapid eye movement ( NREM ) sleep but decreased wakefulness (9.40 ± 0.88 ) h, ( 8.00 ± 1. 21 ) h,(2.46 ±0.81)h s (7.55 ±1.59)h,(6.36±1.54)h,(4.38 ±1.62)h,(P＜0.01, P＜0.05, P＜0.01),respectively] ;Low and high dose GS enhanced δ-wave power of NREM sleep and wakefulness (P＜ 0.05 ) but reduced θ-wave power of wakefulness (P＜0.01) and-wave power during NREM, REM sleep and wakefulness (P ＜ 0.01 ),moreover,Low and high dose GS lowered θ-wave power of REM and NREM stage(P＜0.05 ) ,respectively. After 6days of GS administration, Low and high dose GS increased markedly total sleep(P＜0.05 ) and NREM sleep(P＜0.05 ) but decreased wakefulness (P ＜0.05 ) and sleep-wake cycles (P ＜ 0.05, P ＜ 0.01 ); moreover, Low and high dose GS enhanced δ-wave power during NREM sleep and wakefulness (P ＜ 0. 05 ) but reduced θ-wave power of wakefulness(P ＜ 0.05 ) and -wave power during NREM, NEM sleep and wakefulness (P ＜ 0. 05 ), 10mg/kg GS also lowered θ-wave power of NREM sleep (P＜0.01). Conclusion These results demonstrate that GS can regulate spontaneous sleep architecture in time dependent manner,as well as cortical EEG power spectrum in rats.