蓝萼甲素调节HMGB1-RAGE信号通路对阿尔茨海默病大鼠神经炎症的影响OACSTPCD
Effect of glaucocalyxin A on neuroinflammation in rats with Alzheimer disease by regulating the HMGB1-RAGE signaling pathway
目的 探究蓝萼甲素(GLA)对阿尔茨海默病(AD)大鼠神经炎症及高迁移率族蛋白B1-晚期糖基化终末产物受体(HMGB1-RAGE)信号通路的影响.方法 通过在脑室注射Aβ1-42溶液建立AD大鼠模型,并将大鼠随机分为假手术组、模型组、多奈哌齐组、GLA低剂量组、GLA高剂量组、GLA高+HMGB1组,每组15只.Morris水迷宫实验检测大鼠学习和记忆能力;HE染色检测海马组织病理形态学变化;ELISA检测海马组织中TNF-α、IL-6、IL-1β的含量;免疫荧光检测小胶质细胞标记蛋白Iba-1和星形胶质细胞标记蛋白GFAP的表达;Western blotting检测海马组织中HMGB1-RAGE通路相关蛋白的表达.结果 与假手术组相比,模型组大鼠逃避潜伏期、TNF-α、IL-6、IL-1β的含量、Iba-1和GFAP蛋白阳性表达面积及HMGB1、RAGE、TLR4、p-NF-κB p65/NF-κB p65表达均升高(P<0.05),停留目标象限时间、穿越平台次数减少(P<0.05);与模型组相比,GLA低、高剂量组大鼠逃避潜伏期、TNF-α、IL-6、IL-1β的含量、Iba-1和GFAP蛋白阳性表达面积及HMGB1、RAGE、TLR4、p-NF-κB p65/NF-κB p65表达均降低(P<0.05),停留目标象限时间、穿越平台次数增多(P<0.05),且GLA高剂量组和多奈哌齐组差异无统计学意义(P˃0.05);进一步使用HMGB1重组蛋白进行回补实验,发现GLA对神经炎症的抑制作用被逆转,且RAGE水平升高(P<0.05).结论 GLA可能通过抑制HMGB1-RAGE信号通路减轻AD大鼠的神经炎症.
Objective To investigate the effect of glaucocalyxin A(GLA)on neuroinflammation and the HMGB1-RAGE signaling pathway in rats with Alzheimer disease(AD).Methods Rats were given intracerebroventricular injec-tion of Aβ1-42 solution to establish a model of AD,and then the rats were randomly divided into sham-operation group,model group,donepezil group,low-dose GLA group and high-dose GLA group,and high GLA+HMGB1 group,with 15 rats in each group.The Morris water maze test was used to assess the learning and memory abilities of rats;HE staining was used to observe the pathological and morphological changes of hippocampal tissue;ELISA was used to measure the lev-els of tumor necrosis factor-α(TNF-α),interleukin-6(IL-6),and interleukin-1β(IL-1β)in hippocampal tissue;immu-nofluorescence assay was used to measure the expression of the microglia marker protein Iba-1 and the astrocyte marker protein GFAP;Western blotting was used to measure the expression of HMGB1-RAGE pathway-related proteins in hippo-campal tissue.Results Compared with the sham-operation group,the model group had significant increases in escape la-tency,the content of TNF-α/IL-6/IL-1β,the positive expression area of Iba-1 and GFAP proteins,and the expression lev-els of HMGB1,RAGE,TLR4,and p-NF-κB p65/NF-κB p65(P<0.05),as well as significant reductions in the time spent in the target quadrant and the number of platform crossings(P<0.05).Compared with the model group,the low-and high-dose GLA groups had significant reductions in escape latency,the content of TNF-α/IL-6/IL-1β,the positive ex-pression area of Iba-1 and GFAP proteins,and the expression levels of HMGB1,RAGE,TLR4,and p-NF-κB p65/NF-κB p65(P<0.05),as well as significant increases in the time spent in the target quadrant and the number of platform crossings(P<0.05),and there were no significant differences between the high-dose GLA group and the donepezil group(P>0.05).Further supplementation experiments using HMGB1 recombinant protein showed that the inhibitory effect of GLA on neuroinflammation was reversed,with a sig-nificant increase in the level of RAGE(P<0.05).Conclusion GLA can alleviate neuroinflammation in AD rats by inhibiting the HMGB1-RAGE signaling pathway.
张小喜;邱茜茜;成红学;张俊士
焦作煤业(集团)有限责任公司中央医院神经内科,河南 焦作 454000河南大学淮河医院神经内科,河南 开封 475000
临床医学
蓝萼甲素阿尔茨海默病高迁移率族蛋白B1晚期糖基化终末产物受体神经炎症
Glaucocalyxin AAlzheimer diseaseHigh-mobility group box-1Receptor for advanced glycation end productsNeuroinflammation
《中风与神经疾病杂志》 2024 (008)
723-728 / 6
河南省自然科技项目(222102310315)
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