基于IKKβ/NF-κB通路探讨温胆汤对睡眠障碍小鼠的神经保护作用

Neuroprotective effect of Wendan Decoction on a mouse model of sleep disorders via IKKβ/NF-κB pathway

目的 探讨温胆汤对睡眠障碍小鼠神经损伤的影响及其机制。方法 小鼠采用改良版水平转盘睡眠剥夺法构建失眠模型,造模成功后随机分为模型组、艾司唑仑片组(0.15 mg/kg)和温胆汤低、高剂量组(12.5、50 g/kg),每组6只,另取6只作为对照组。给药干预7 d后,HE染色观察大脑皮层组织、海马CA1区组织、下丘脑组织变化;尼氏染色观察神经元损伤情况;ELISA法检测脑组织和血清中神经丝轻链(NEFL)、神经特异性烯醇化酶(NSE)、S100钙结合蛋白B(S100B)、肿瘤坏死因子(TNF-α)、白细胞介素6(IL-6)、白细胞介素1β(IL-1β)水平;免疫组化法检测脑组织中胶质纤维酸性蛋白(GFAP)表达;Western blot法检测脑组织中GFAP、磷酸化IκB激酶β(p-IKKβ)、磷酸化核转录因子-κB(p-NF-κB)蛋白表达。结果 与模型组比较,温胆汤高剂量组小鼠神经元细胞数量增加,结构完整,排列整齐,神经元细胞核皱缩变形数量减少,尼氏小体增多,血清和脑组织NEFL、NSE、S100B、TNF-α、IL-6、IL-1β水平降低(P<0.01),脑组织GFAP表达降低(P<0.01),脑组织p-IKKβ和p-NF-κB磷酸化水平均降低(P<0.01)。结论 温胆汤能够减少睡眠障碍小鼠的神经损伤,减少促炎介质释放,其机制可能与抑制IKKβ/NF-κB通路的激活有关。

AIM To investigate the effect of Wendan Decoction on nerve injury in a mouse model of sleep disorders and its mechanism.METHODS A mouse model of insomnia was established by the modified multiple platform sleep deprivation method.After successful modeling,the mice were randomly divided into the model group,the estazolam tablet group(015 mg/kg)and the low-dose and high-dose Wendan Decoction groups(125,50 g/kg),with 6 mice in each group,in contrast to the 6 mice of the control group.After 7 days of drug intervention,the mice had their changes of cerebral cortex,hippocampal CA1 area and hypothalamus observed by HE staining;their neuronal damage observed by Nissl staining;their levels of neurofilament light chain(NEFL),neuron-specific enolase(NSE),S100 calcium-binding protein B(S100B),tumor necrosis factor(TNF-α),interleukin-6(IL-6)and interleukin-1β(IL-1β)in brain tissue and serum detected by ELISA;their cerebral expression of glial fibrillary acidic protein(GFAP)detected by immunohistochemical method;and their cerebral expressions of GFAP,phosphorylated IκB kinaseβ(p-IKKβ)and phosphorylated nuclear transcription factor-κB(p-NF-κB)detected by Western blot.RESULTS Compared with the model group,the high-dose Wendan Decoction group displayed increased number of neurons,complete and neatly arranged structure;decreased number of neurons with nuclear shrinkage and deformation;increased Nissl bodies,decreased levels of NEFL,NSE,S100B,TNF-α,IL-6 and IL-1βin serum and brain tissue(P<001);decreased cerebral expression of GFAP(P<001);and decreased phosphorylation levels of cerebral p-IKKβand p-NF-κB(P<001).CONCLUSION Wendan Decoction can reduce the nerve damage and the expression of proinflammatory mediator in sleep disorders mice,and the mechanism may be related to the inhibited activation of IKKβ/NF-κB pathway.