The E3 ubiquitin ligase,carboxyl terminus of heat shock protein 70(Hsp70)interacting protein(CHIP),also functions as a co-chaperone and plays a crucial role in the protein quality control system.In this study,we aimed...The E3 ubiquitin ligase,carboxyl terminus of heat shock protein 70(Hsp70)interacting protein(CHIP),also functions as a co-chaperone and plays a crucial role in the protein quality control system.In this study,we aimed to investigate the neuroprotective effect of overexpressed CHIP on Alzheimer’s disease.We used an adeno-associated virus vector that can cross the blood-brain barrier to mediate CHIP overexpression in APP/PS1 mouse brain.CHIP overexpression significantly ameliorated the performance of APP/PS1 mice in the Morris water maze and nest building tests,reduced amyloid-βplaques,and decreased the expression of both amyloid-βand phosphorylated tau.CHIP also alleviated the concentration of microglia and astrocytes around plaques.In APP/PS1 mice of a younger age,CHIP overexpression promoted an increase in ADAM10 expression and inhibitedβ-site APP cleaving enzyme 1,insulin degrading enzyme,and neprilysin expression.Levels of HSP70 and HSP40,which have functional relevance to CHIP,were also increased.Single nuclei transcriptome sequencing in the hippocampus of CHIP overexpressed mice showed that the lysosomal pathway and oligodendrocyte-related biological processes were up-regulated,which may also reflect a potential mechanism for the neuroprotective effect of CHIP.Our research shows that CHIP effectively reduces the behavior and pathological manifestations of APP/PS1 mice.Indeed,overexpression of CHIP could be a beneficial approach for the treatment of Alzheimer’s disease.展开更多
目的观察蛋白酶体抑制剂MG-132(N-benz0y1 oxycarbonyl(Z)-Leu-Leuleucina1)对急性缺血再灌注大鼠心肌(carboxyl terminus of the Hsc70-interacting protein,CHIP)、HSP70的影响以探讨MG-132的心肌保护机制。方法选择SD大鼠结扎左冠状...目的观察蛋白酶体抑制剂MG-132(N-benz0y1 oxycarbonyl(Z)-Leu-Leuleucina1)对急性缺血再灌注大鼠心肌(carboxyl terminus of the Hsc70-interacting protein,CHIP)、HSP70的影响以探讨MG-132的心肌保护机制。方法选择SD大鼠结扎左冠状动脉前降支30min制作心肌缺血再灌注模型,54只大鼠按随机数字表法分入以下各组:治疗(I/R+T)组于再灌注前5min静脉注射MG-132(0.75mg/kg),对照(I/R)组及假手术(Sham)组注射生理盐水,并将I/R组和I/R+T组分为再灌注2、24h及7d亚组(各亚组各8只大鼠),分别用荧光定量PCR法及Western blot法检测CHIP及HSP70的mRNA及蛋白质表达,并进行相关性分析。结果与I/R各时相组相比,I/R+T各时相组CHIP及HSP70的mRNA水平显著升高[(0.87±0.10)vs(0.50±0.06),(0.57±0.07)vs(0.33±0.04),(0.47±0.06)vs(0.19±0.03),P<0.01]。与I/R2、24h组相比I/R+T组CHIP及mRNA水平显著升高[(1.15±0.12)vs(0.57±0.07),(0.81±0.09)vs(0.44±0.06),P<0.01];MG-132上调了I/R+T各时相组HSP70的蛋白质表达,与I/R各组相比,差异均有统计学意义[(1.28±0.16)vs(0.79±0.08),(0.88±0.12)vs(0.58±0.12),(0.9±0.17)vs(0.50±0.09),P<0.01];MG-132上调了I/R+T2、24h组CHIP的蛋白质表达,与I/R2、24h组相比,差异有统计学意义[(1.43±0.15)vs(1.04±0.11),P<0.01;(1.16±0.11)vs(0.96±0.13)],P<0.05)。结论心肌缺血再灌注前适量静注MG-132能显著刺激缺血再灌注大鼠心脏CHIP表达,从而进一步上调HSP70水平,从而保护心肌。展开更多
基金supported by the National Natural Science Foundation of China,Nos.91849115 and U1904207(to YX),81974211 and 82171247(to CS)Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences,No.2020-PT310-01(to YX).
文摘The E3 ubiquitin ligase,carboxyl terminus of heat shock protein 70(Hsp70)interacting protein(CHIP),also functions as a co-chaperone and plays a crucial role in the protein quality control system.In this study,we aimed to investigate the neuroprotective effect of overexpressed CHIP on Alzheimer’s disease.We used an adeno-associated virus vector that can cross the blood-brain barrier to mediate CHIP overexpression in APP/PS1 mouse brain.CHIP overexpression significantly ameliorated the performance of APP/PS1 mice in the Morris water maze and nest building tests,reduced amyloid-βplaques,and decreased the expression of both amyloid-βand phosphorylated tau.CHIP also alleviated the concentration of microglia and astrocytes around plaques.In APP/PS1 mice of a younger age,CHIP overexpression promoted an increase in ADAM10 expression and inhibitedβ-site APP cleaving enzyme 1,insulin degrading enzyme,and neprilysin expression.Levels of HSP70 and HSP40,which have functional relevance to CHIP,were also increased.Single nuclei transcriptome sequencing in the hippocampus of CHIP overexpressed mice showed that the lysosomal pathway and oligodendrocyte-related biological processes were up-regulated,which may also reflect a potential mechanism for the neuroprotective effect of CHIP.Our research shows that CHIP effectively reduces the behavior and pathological manifestations of APP/PS1 mice.Indeed,overexpression of CHIP could be a beneficial approach for the treatment of Alzheimer’s disease.
文摘目的观察蛋白酶体抑制剂MG-132(N-benz0y1 oxycarbonyl(Z)-Leu-Leuleucina1)对急性缺血再灌注大鼠心肌(carboxyl terminus of the Hsc70-interacting protein,CHIP)、HSP70的影响以探讨MG-132的心肌保护机制。方法选择SD大鼠结扎左冠状动脉前降支30min制作心肌缺血再灌注模型,54只大鼠按随机数字表法分入以下各组:治疗(I/R+T)组于再灌注前5min静脉注射MG-132(0.75mg/kg),对照(I/R)组及假手术(Sham)组注射生理盐水,并将I/R组和I/R+T组分为再灌注2、24h及7d亚组(各亚组各8只大鼠),分别用荧光定量PCR法及Western blot法检测CHIP及HSP70的mRNA及蛋白质表达,并进行相关性分析。结果与I/R各时相组相比,I/R+T各时相组CHIP及HSP70的mRNA水平显著升高[(0.87±0.10)vs(0.50±0.06),(0.57±0.07)vs(0.33±0.04),(0.47±0.06)vs(0.19±0.03),P<0.01]。与I/R2、24h组相比I/R+T组CHIP及mRNA水平显著升高[(1.15±0.12)vs(0.57±0.07),(0.81±0.09)vs(0.44±0.06),P<0.01];MG-132上调了I/R+T各时相组HSP70的蛋白质表达,与I/R各组相比,差异均有统计学意义[(1.28±0.16)vs(0.79±0.08),(0.88±0.12)vs(0.58±0.12),(0.9±0.17)vs(0.50±0.09),P<0.01];MG-132上调了I/R+T2、24h组CHIP的蛋白质表达,与I/R2、24h组相比,差异有统计学意义[(1.43±0.15)vs(1.04±0.11),P<0.01;(1.16±0.11)vs(0.96±0.13)],P<0.05)。结论心肌缺血再灌注前适量静注MG-132能显著刺激缺血再灌注大鼠心脏CHIP表达,从而进一步上调HSP70水平,从而保护心肌。
