Soluble receptor for advanced glycation end products(sRAGE)acts as a decoy sequestering of RAGE ligands,thus preventing the activation of the ligand-RAGE axis linking human diseases.However,the molecular mechanisms un...Soluble receptor for advanced glycation end products(sRAGE)acts as a decoy sequestering of RAGE ligands,thus preventing the activation of the ligand-RAGE axis linking human diseases.However,the molecular mechanisms underlying sRAGE remain unclear.In this study,THP-1 monocytes were cultured in normal glucose(NG,5.5 mmol/L)and high glucose(HG,15 mmol/L)to investigate the effects of diabetesrelevant glucose concentrations on sRAGE and interleukin-1β(IL-1β)secretion.The modulatory effects of epigallocatechin gallate(EGCG)in response to HG challenge were also evaluated.HG enhanced intracellular reactive oxygen species(ROS)generation and RAGE expression.The secretion of sRAGE,including esRAGE and cRAGE,was reduced under HG conditions,together with the downregulation of a disintegrin and metallopeptidase 10(ADAM10)and nuclear factor erythroid 2-related factor 2(Nrf2)nuclear translocation.Mechanistically,the HG effects were counteracted by siRAGE and exacerbated by siNrf2.Chromatin immunoprecipitation results showed that Nrf2 binding to the ADAM10 promoter and HG interfered with this binding.Our data reinforce the notion that RAGE and Nrf2 might be sRAGE-regulating factors.Under HG conditions,the treatment of EGCG reduced ROS generation and RAGE activation.EGCG-stimulated cRAGE release was likely caused by the upregulation of the Nrf2-ADAM10 pathway.EGCG inhibited HG-mediated NLRP3 inflammasome activation at least partly by stimulating sRAGE,thereby reducing IL-1βrelease.展开更多
目的探究晚期糖基化终末产物(Receptor for Advanced Glycation End Products,RAGE)受体阻断剂对癫痫幼鼠脑电图、神经元损伤及S100B蛋白表达的影响。方法选取40只无特定病原体级SD雄性幼鼠,随机分为正常组(N组)、模型组(M组)、苯妥英钠...目的探究晚期糖基化终末产物(Receptor for Advanced Glycation End Products,RAGE)受体阻断剂对癫痫幼鼠脑电图、神经元损伤及S100B蛋白表达的影响。方法选取40只无特定病原体级SD雄性幼鼠,随机分为正常组(N组)、模型组(M组)、苯妥英钠组(P组)、RAGE受体阻断剂组(R组),每组10只。M组、P组、R组腹腔注射戊四氮建立癫痫模型,N组不建立该模型,建模成功后,对P组腹腔注射20 mg/kg苯妥英钠,对R组腹腔注射1 mg/kg RAGE受体阻断剂FPS-ZM,N组、M组同期腹腔注射同体积0.9%氯化钠溶液。观察各组幼鼠模型行为学,记录脑电图,采用FJB染色和尼氏染色检测神经元损伤情况,免疫酶标法检测S100B蛋白表达。结果与N组比较,M组、P组、R组幼鼠Racine评分、发作持续时间、发作次数明显升高(P<0.05);与M组比较,P组、R组幼鼠Racine评分、发作持续时间、发作次数明显降低(P<0.05);且与P组相比,R组上述指标显著降低(P<0.05)。与N组比较,M组、P组、R组幼鼠波幅明显升高(P<0.05);频率明显降低(P<0.05);与M组比较,P组、R组幼鼠波幅明显降低(P<0.05),频率明显升高(P<0.05);且与P组相比,R组上述指标变化显著(P<0.05)。与M组相比,P组、R组神经元损伤明显减轻,神经元数量有所增加,神经元形态有所改善,神经元细胞及尼氏小体数目明显增加。与N组比较,M组、P组、R组海马、中脑、额叶皮层S100B蛋白表达显著升高(P<0.05);与M组比较,P组、R组海马、中脑、额叶皮层S100B蛋白表达显著降低(P<0.05);且与P组相比,R组上述指标显著降低(P<0.05)。结论RAGE受体阻断剂可显著改善癫痫幼鼠脑电图和神经元损伤,并抑制S100B蛋白表达。展开更多
Background:Ischemic stroke is characterized by permanent or transient obstruction of blood flow,leading to a growing risk factor and health burden.Tianmagouteng yin(TMG)is commonly used in Chinese medicine to treat ce...Background:Ischemic stroke is characterized by permanent or transient obstruction of blood flow,leading to a growing risk factor and health burden.Tianmagouteng yin(TMG)is commonly used in Chinese medicine to treat cerebral ischemia.The aim of this study was to investigate the neuroprotective effects of TMG against ischemic stroke.Methods:Either permanent middle cerebral artery occlusion(pMCAO)or sham operation was performed on anesthetized Wistar male rats(n=36).Results:Results demonstrated that TMG administration reduced the infarction volume and mitigated the neurobehavioral deficits.Hematoxylin and eosin(HE)staining and Prussian blue staining revealed that TMG attenuated tissue disruption and microbleeds in hippocampus tissues.In addition,TMG down-regulated the receptor of advanced glycation end products(RAGE)and p-JAK2.It also inhibited the concentrations of advanced glycation end products(AGEs),ferritin,malondialdehyde(MDA),and reactive oxygen species(ROS).Conclusion:As repetitive clinical trials of neuroprotectants targeting stroke have failed previously,our results suggested that the natural product,TMG,can probably help in the vicious cycles of ischemic stroke pathology.展开更多
文摘Soluble receptor for advanced glycation end products(sRAGE)acts as a decoy sequestering of RAGE ligands,thus preventing the activation of the ligand-RAGE axis linking human diseases.However,the molecular mechanisms underlying sRAGE remain unclear.In this study,THP-1 monocytes were cultured in normal glucose(NG,5.5 mmol/L)and high glucose(HG,15 mmol/L)to investigate the effects of diabetesrelevant glucose concentrations on sRAGE and interleukin-1β(IL-1β)secretion.The modulatory effects of epigallocatechin gallate(EGCG)in response to HG challenge were also evaluated.HG enhanced intracellular reactive oxygen species(ROS)generation and RAGE expression.The secretion of sRAGE,including esRAGE and cRAGE,was reduced under HG conditions,together with the downregulation of a disintegrin and metallopeptidase 10(ADAM10)and nuclear factor erythroid 2-related factor 2(Nrf2)nuclear translocation.Mechanistically,the HG effects were counteracted by siRAGE and exacerbated by siNrf2.Chromatin immunoprecipitation results showed that Nrf2 binding to the ADAM10 promoter and HG interfered with this binding.Our data reinforce the notion that RAGE and Nrf2 might be sRAGE-regulating factors.Under HG conditions,the treatment of EGCG reduced ROS generation and RAGE activation.EGCG-stimulated cRAGE release was likely caused by the upregulation of the Nrf2-ADAM10 pathway.EGCG inhibited HG-mediated NLRP3 inflammasome activation at least partly by stimulating sRAGE,thereby reducing IL-1βrelease.
基金Scientific Research Project of Hebei Administration of Traditional Chinese Medicine(2020136)Science Research Project of Hebei Education Department(ZD2022043)。
文摘目的探究晚期糖基化终末产物(Receptor for Advanced Glycation End Products,RAGE)受体阻断剂对癫痫幼鼠脑电图、神经元损伤及S100B蛋白表达的影响。方法选取40只无特定病原体级SD雄性幼鼠,随机分为正常组(N组)、模型组(M组)、苯妥英钠组(P组)、RAGE受体阻断剂组(R组),每组10只。M组、P组、R组腹腔注射戊四氮建立癫痫模型,N组不建立该模型,建模成功后,对P组腹腔注射20 mg/kg苯妥英钠,对R组腹腔注射1 mg/kg RAGE受体阻断剂FPS-ZM,N组、M组同期腹腔注射同体积0.9%氯化钠溶液。观察各组幼鼠模型行为学,记录脑电图,采用FJB染色和尼氏染色检测神经元损伤情况,免疫酶标法检测S100B蛋白表达。结果与N组比较,M组、P组、R组幼鼠Racine评分、发作持续时间、发作次数明显升高(P<0.05);与M组比较,P组、R组幼鼠Racine评分、发作持续时间、发作次数明显降低(P<0.05);且与P组相比,R组上述指标显著降低(P<0.05)。与N组比较,M组、P组、R组幼鼠波幅明显升高(P<0.05);频率明显降低(P<0.05);与M组比较,P组、R组幼鼠波幅明显降低(P<0.05),频率明显升高(P<0.05);且与P组相比,R组上述指标变化显著(P<0.05)。与M组相比,P组、R组神经元损伤明显减轻,神经元数量有所增加,神经元形态有所改善,神经元细胞及尼氏小体数目明显增加。与N组比较,M组、P组、R组海马、中脑、额叶皮层S100B蛋白表达显著升高(P<0.05);与M组比较,P组、R组海马、中脑、额叶皮层S100B蛋白表达显著降低(P<0.05);且与P组相比,R组上述指标显著降低(P<0.05)。结论RAGE受体阻断剂可显著改善癫痫幼鼠脑电图和神经元损伤,并抑制S100B蛋白表达。
基金Zhejiang TCM Science and Technology Program[Grant Number 2021ZA050].
文摘Background:Ischemic stroke is characterized by permanent or transient obstruction of blood flow,leading to a growing risk factor and health burden.Tianmagouteng yin(TMG)is commonly used in Chinese medicine to treat cerebral ischemia.The aim of this study was to investigate the neuroprotective effects of TMG against ischemic stroke.Methods:Either permanent middle cerebral artery occlusion(pMCAO)or sham operation was performed on anesthetized Wistar male rats(n=36).Results:Results demonstrated that TMG administration reduced the infarction volume and mitigated the neurobehavioral deficits.Hematoxylin and eosin(HE)staining and Prussian blue staining revealed that TMG attenuated tissue disruption and microbleeds in hippocampus tissues.In addition,TMG down-regulated the receptor of advanced glycation end products(RAGE)and p-JAK2.It also inhibited the concentrations of advanced glycation end products(AGEs),ferritin,malondialdehyde(MDA),and reactive oxygen species(ROS).Conclusion:As repetitive clinical trials of neuroprotectants targeting stroke have failed previously,our results suggested that the natural product,TMG,can probably help in the vicious cycles of ischemic stroke pathology.
