目的观察左归降糖解郁方对模拟糖尿病并发抑郁症(DD)环境下海马神经元的影响,探讨其可能的作用机制。方法海马神经元原代细胞取自受孕18 d SD大鼠胎鼠,葡萄糖联合皮质酮干预构建DD海马神经元细胞模型。将培养的海马神经元随机分为正常...目的观察左归降糖解郁方对模拟糖尿病并发抑郁症(DD)环境下海马神经元的影响,探讨其可能的作用机制。方法海马神经元原代细胞取自受孕18 d SD大鼠胎鼠,葡萄糖联合皮质酮干预构建DD海马神经元细胞模型。将培养的海马神经元随机分为正常组、空白血清组、模型组、阳性药(二甲双胍+氟西汀)药物血清组、中药(左归降糖解郁方)药物血清组和阻断剂组。正常组和模型组给予等量培养液,阻断剂组给予促肾上腺皮质激素释放激素1型受体(CRHR1)阻断剂安塔拉明200μmol/L,其余组给予体积分数为10%的药物血清或空白血清,造模干预18 h后,尼氏染色检测海马神经元损伤情况,高内涵细胞成像分析(HCA)技术检测CRHR1、突触可塑性相关蛋白切丝蛋白(Cofilin)和肌动蛋白(Actin)蛋白的表达,实时荧光定量PCR检测CRHR1、Cofilin和Actin mRNA的表达。结果与正常组及空白血清组比较,模型组海马神经元神经网络、树突棘断裂或消失,尼氏小体数量显著减少,CRHR1表达明显上调(P<0.01),Cofilin和Actin表达明显下调(P<0.05);与模型组比较,阳性药药物血清组、中药药物血清组和阻断剂组可一定程度上逆转上述变化(P<0.05,P<0.01)。结论左归降糖解郁方对模拟DD环境下海马神经元具有保护作用,其机制与调控CRHR1、Cofilin、Actin的表达有关。展开更多
Adverse experiences in early life have long-lasting negative impacts on behavior and the brain in adulthood,one of which is sleep disturbance.As the corticotropin-releasing hormone(CRH)–corticotropin-releasing hormon...Adverse experiences in early life have long-lasting negative impacts on behavior and the brain in adulthood,one of which is sleep disturbance.As the corticotropin-releasing hormone(CRH)–corticotropin-releasing hormone receptor 1(CRHR1)system and nucleus accumbens(NAc)play important roles in both stress responses and sleep-wake regulation,in this study we investigated whether the NAc CRH–CRHR1 system mediates early-life stress-induced abnormalities in sleep-wake behavior in adult mice.Using the limited nesting and bedding material paradigm from postnatal days 2 to 9,we found that early-life stress disrupted sleep-wake behaviors during adulthood,including increased wakefulness and decreased non-rapid eye movement(NREM)sleep time during the dark period and increased rapid eye movement(REM)sleep time during the light period.The stress-induced sleep disturbances were accompanied by dendritic atrophy in the NAc and both were largely reversed by daily systemic administration of the CRHR1 antagonist antalarmin during stress exposure.Importantly,Crh overexpression in the NAc reproduced the effects of early-life stress on sleep-wake behavior and NAc morphology,whereas NAc Crhr1 knockdown reversed these effects(including increased wakefulness and reduced NREM sleep in the dark period and NAc dendritic atrophy).Together,our findings demonstrate the negative influence of early-life stress on sleep architecture and the structural plasticity of the NAc,and highlight the critical role of the NAc CRH–CRHR1 system in modulating these negative outcomes evoked by early-life stress.展开更多
文摘目的观察左归降糖解郁方对模拟糖尿病并发抑郁症(DD)环境下海马神经元的影响,探讨其可能的作用机制。方法海马神经元原代细胞取自受孕18 d SD大鼠胎鼠,葡萄糖联合皮质酮干预构建DD海马神经元细胞模型。将培养的海马神经元随机分为正常组、空白血清组、模型组、阳性药(二甲双胍+氟西汀)药物血清组、中药(左归降糖解郁方)药物血清组和阻断剂组。正常组和模型组给予等量培养液,阻断剂组给予促肾上腺皮质激素释放激素1型受体(CRHR1)阻断剂安塔拉明200μmol/L,其余组给予体积分数为10%的药物血清或空白血清,造模干预18 h后,尼氏染色检测海马神经元损伤情况,高内涵细胞成像分析(HCA)技术检测CRHR1、突触可塑性相关蛋白切丝蛋白(Cofilin)和肌动蛋白(Actin)蛋白的表达,实时荧光定量PCR检测CRHR1、Cofilin和Actin mRNA的表达。结果与正常组及空白血清组比较,模型组海马神经元神经网络、树突棘断裂或消失,尼氏小体数量显著减少,CRHR1表达明显上调(P<0.01),Cofilin和Actin表达明显下调(P<0.05);与模型组比较,阳性药药物血清组、中药药物血清组和阻断剂组可一定程度上逆转上述变化(P<0.05,P<0.01)。结论左归降糖解郁方对模拟DD环境下海马神经元具有保护作用,其机制与调控CRHR1、Cofilin、Actin的表达有关。
基金supported by the National Key Basic Research Program of China(973 Program,2015CB856401)the Beijing National Science Foundation(7222236)+1 种基金the Capital Medical Development Research Fund(2020-2-4113)the National Natural Science Foundation of China(81630031,81771468,82071528,and 82171529).
文摘Adverse experiences in early life have long-lasting negative impacts on behavior and the brain in adulthood,one of which is sleep disturbance.As the corticotropin-releasing hormone(CRH)–corticotropin-releasing hormone receptor 1(CRHR1)system and nucleus accumbens(NAc)play important roles in both stress responses and sleep-wake regulation,in this study we investigated whether the NAc CRH–CRHR1 system mediates early-life stress-induced abnormalities in sleep-wake behavior in adult mice.Using the limited nesting and bedding material paradigm from postnatal days 2 to 9,we found that early-life stress disrupted sleep-wake behaviors during adulthood,including increased wakefulness and decreased non-rapid eye movement(NREM)sleep time during the dark period and increased rapid eye movement(REM)sleep time during the light period.The stress-induced sleep disturbances were accompanied by dendritic atrophy in the NAc and both were largely reversed by daily systemic administration of the CRHR1 antagonist antalarmin during stress exposure.Importantly,Crh overexpression in the NAc reproduced the effects of early-life stress on sleep-wake behavior and NAc morphology,whereas NAc Crhr1 knockdown reversed these effects(including increased wakefulness and reduced NREM sleep in the dark period and NAc dendritic atrophy).Together,our findings demonstrate the negative influence of early-life stress on sleep architecture and the structural plasticity of the NAc,and highlight the critical role of the NAc CRH–CRHR1 system in modulating these negative outcomes evoked by early-life stress.
