睡眠剥夺对海马PV中间神经元痕迹性眨眼条件反射相关放电活动的影响  

Effect of sleep deprivation on firing activity of hippocampal parvalbumin-expressing interneurons associated with trace eyeblink conditioning

作　　者：詹悦 李容瑢 张洁 李红丽 ZHAN Yue;LI Rongrong;ZHANG Jie;LI Hongli(Experimental Center of Basic Medicine,College of Basic Medical Sciences,Army Medical University(Third Military Medical University),Chongqing,China;Department of Histoembryology,College of Basic Medical Sciences,Army Medical University(Third Military Medical University),Chongqing,China;Department of Physiology,College of Basic Medical Sciences,Army Medical University(Third Military Medical University),Chongqing,China)

机构地区：[1]陆军军医大学基础医学院基础医学教学实验中心 [2]陆军军医大学基础医学院组织胚胎学教研室 [3]陆军军医大学基础医学院生理学教研室

出　　处：《陆军军医大学学报》2025年第4期307-317,共11页Journal of Army Medical University

基　　金：国家自然科学基金青年项目(82101561);重庆市自然科学基金面上项目(CSTB2023NSCQ-MSX0905)。

摘　　要：目的研究睡眠剥夺对小鼠海马小清蛋白阳性中间神经元(Parvalbumin-expressing interneuron,PV-IN)在痕迹性眨眼条件反射(Trace eyeblink conditioning,tEBC)训练过程中和恢复性睡眠期间峰电位发放活动的影响。方法15只PV-Cre小鼠随机分为睡眠剥夺组(n=8)和对照组(n=7)。2组小鼠均接受连续5 d的行为训练。睡眠剥夺组小鼠每天tEBC训练后进行1.5 h的睡眠剥夺,之后再被允许进行1.5 h的恢复性睡眠。对照组小鼠则在tEBC训练后允许自由睡眠。利用多通道记录和光遗传学刺激技术,在体条件下标记海马PV-IN。结果睡眠剥夺组小鼠的条件性眨眼反应(Conditioned eyeblink response,CR)发生率并未随训练日的增加而增加(P>0.05)。在第3~5训练日,睡眠剥夺组小鼠CR发生率显著低于对照组小鼠(P<0.05);与对照组相比,睡眠剥夺组小鼠海马PV-IN在tEBC训练过程中被条件刺激(Conditioned stimulus,CS)所诱发的放电增强反应显著更低(P<0.05);与训练前睡眠期相比,睡眠剥夺组小鼠海马PV-IN在恢复性睡眠期尖波涟漪波振荡发生时的峰电位发放显著增强(P<0.05),且增强效应显著高于对照组(P<0.05);睡眠剥夺对海马非PV中间神经元在tEBC训练过程中和恢复性睡眠期间峰电位发放活动的影响均不显著(P>0.05)。结论睡眠剥夺对海马PV-IN在tEBC训练过程中和恢复性睡眠期间放电反应有着双重影响,这可能是睡眠剥夺引起tEBC记忆形成和巩固障碍的细胞活动机制。Objective To investigate the effects of sleep deprivation on the firing activity of hippocampal parvalbumin-expressing interneuron(PV-IN)of mice during trace eyeblink conditioning(tEBC)training and during recovery sleep.Methods A total of 15 PV-Cre mice were randomly assigned into a sleep deprivation group(n=8)and a control group(n=7).After daily tEBC training,the sleep deprivation group experienced 1.5 h of sleep deprivation followed by 1.5 h of recovery sleep,and the control group mice were allowed to sleep freely,for 5 consecutive days.Multichannel recording and optogenetic techniques was applied to identify the hippocampal PV-IN in vivo.Results The sleep deprived mice failed to show significant increase in the incidence of conditioned eyeblink response(CR)across 5 training days(P>0.05).On training days 3~5,the CR incidence was significantly lower in the sleep deprived mice than the control mice(P<0.05).The enhancement of conditioned stimulus(CS)-evoked firing activity in hippocampal PV-INs during tEBC training was significantly lower in the sleep deprived mice when compared to the control mice(P<0.05).The sleep deprived mice obtained notably strengthened firing activity of hippocampal PV-INs peri sharp wave ripple events during recovery sleep period when compared with the pre-training sleep period(P<0.05),and the enhancement was remarkably greater than that in the control mice(P<0.05).Sleep deprivation had no obvious effects on the firing activity of hippocampal non PV-IN during either tEBC training or recovery sleep(P>0.05).Conclusion Sleep deprivation produces dual effects on the firing activities of hippocampal PV-INs during tEBC training and recovery sleep.These effects may be the cellular mechanisms of tEBC memory formation and consolidation disorders caused by sleep deprivation.

关 键 词：睡眠剥夺 海马 中间神经元 痕迹性条件反射 

分 类 号：R322.81[医药卫生—人体解剖和组织胚胎学] R338.1[医药卫生—基础医学] R338.8