槲皮素通过HMGB1/RAGE/NF-κB通路减轻癫痫大鼠神经炎症的实验研究

An experimental study of quercetin attenuating neuroinflammation in epileptic rats through HMGB1/RAGE/NF-κB pathway

目的:探讨槲皮素是否通过调控高迁移率族蛋白B1(HMGB1)、糖基化终末产物受体(RAGE)、核转录因子κB(NF-κB)参与减轻癫痫大鼠神经炎症,探究HMGB1/RAGE/NF-κB通路作为槲皮素作用新靶点的可能性。方法:将60只SD大鼠随机选取12只作为健康组,剩余大鼠构建癫痫大鼠实验模型,将造模成功的大鼠分为模型组、槲皮素高剂量组、槲皮素低剂量组、槲皮素+通路激活剂组,每组12只。观察大鼠海马组织病理变化;评估大鼠的神经行为学功能;检测大鼠海马组织肿瘤坏死因子-α(TNF-α)、IL-6、IL-1β水平及HMGB1、RAGE、NF-κB mRNA及蛋白表达。结果:健康组大鼠海马组织结构完整;与健康组相比,模型组大鼠海马组织结构分散,存活神经元数显著降低,凋亡指数显著上升,Racine等级显著升高,海马组织TNF-α、IL-1β、IL-6含量及HMGB1、RAGE、NF-κB mRNA和蛋白表达量显著升高;与模型组相比,槲皮素低、高剂量组大鼠海马组织结构较为完整,存活神经元数显著上升,凋亡指数显著降低,Racine等级显著降低,TNF-α、IL-1β、IL-6含量及HMGB1、RAGE、NF-κB mRNA和蛋白表达量显著降低,且槲皮素高剂量组的改善效果更佳;与槲皮素高剂量组相比,槲皮素+通路激活剂组存活神经元数显著降低,凋亡指数显著上升,Racine等级显著升高,海马组织TNF-α、IL-1β、IL-6含量及HMGB1、RAGE、NF-κB mRNA和蛋白表达量显著升高。结论:槲皮素可通过抑制HMGB1/RAGE/NF-κB通路,降低相关基因mRNA和蛋白表达,从而有效减轻癫痫大鼠的神经炎症。

Objective:To investigate whether quercetin reduces neuroinflammation in epileptic rats by regulating high mobility group protein B1(HMGB1),receptor for advanced glycation end products(RAGE)and nuclear factor kappa-B(NF-κB),and to explore the possibility of HMGB1/RAGE/NF-κB pathway as a new target of quercetin.Methods:Twelve SD rats were randomly selected from 60 SD rats as healthy group,and the remaining rats were used to construct experimental models of epilepsy rats.Rats that were successfully modeled were divided into model group,high-dose quercetin group,low-dose quercetin group,quercetin+pathway activator group,with 12 rats in each group.Pathological changes of hippocampal tissue of rats were observed;neurobehavioral function of rats was evaluated;levels of tumor necrosis factor-α(TNF-α),IL-6 and IL-1β,and mRNA and protein expression levels of HMGB1,RAGE,NF-κB in hippocampal tissue of rats were detected.Results:Structure of hippocampus of rats in healthy group was complete;compared with healthy group,structure of hippocampal tissue of rats in model group was scattered,the number of surviving neurons was observably reduced,apoptotic index was observably increased,the Racine grade was observably increased,TNF-α,IL-1β,IL-6 contents and mRNA and protein expression levels of HMGB1,RAGE,NF-κB in hippocampal tissue were significantly increased;compared with model group,structure of hippocampal tissue of rats in low-and high-dose quercetin groups was relatively complete,the number of surviving neurons was observably increased,apoptotic index was observably decreased,the Racine grade was significantly decreased,TNF-α,IL-1β,IL-6 contents and mRNA and protein expression levels of HMGB1,RAGE,NF-κB were significantly reduced,and the improvement effect of high-dose quercetin group was better;compared with high-dose quercetin group,the number of surviving neurons in quercetin+pathway activator group was significantly reduced,apoptotic index was significantly increased,the Racine grade was significantly increased,TNF-α,IL-1β,IL-6 contents and mRNA and protein expression levels of HMGB1,RAGE,NF-κB in hippocampal tissue were significantly increased.Conclusion:Quercetin can effectively reduce neuroinflammation in epileptic rats by inhibiting the HMGB1/RAGE/NF-κB pathway and reducing the mRNA and protein expressions of related genes.