目的:探讨热休克蛋白70结合蛋白1(heat shock protein 70 binding protein 1,HspBP1)能否促进内源性突变亨廷顿蛋白(mutant Huntingtin,mHTT)在星形胶质细胞中积聚,并确定其是否能够介导病理性损伤。方法:在GFAP-HD转基因小鼠的星形胶...目的:探讨热休克蛋白70结合蛋白1(heat shock protein 70 binding protein 1,HspBP1)能否促进内源性突变亨廷顿蛋白(mutant Huntingtin,mHTT)在星形胶质细胞中积聚,并确定其是否能够介导病理性损伤。方法:在GFAP-HD转基因小鼠的星形胶质细胞中过表达HspBP1,通过免疫染色和蛋白印迹法检测mHTT和神经病理相关蛋白表达水平,并通过行为学实验观察小鼠的运动功能水平。结果:GFAP-HD转基因小鼠短期内即出现星形胶质细胞中的mHTT积聚以及运动功能障碍,但并未出现星形胶质细胞活化和神经元损伤。结论:HspBP1能够通过促进星形胶质细胞内源性mHTT积聚介导病理性损伤,但mHTT在神经元和星形胶质细胞中共同表达可能是神经元显著变性的必需条件。展开更多
Huntington's disease(HD) is a deadly neurodegenerative disease with abnormal expansion of CAG repeats in the huntingtin gene. Mutant Huntingtin protein(m HTT) forms abnormal aggregates and intranuclear inclusions ...Huntington's disease(HD) is a deadly neurodegenerative disease with abnormal expansion of CAG repeats in the huntingtin gene. Mutant Huntingtin protein(m HTT) forms abnormal aggregates and intranuclear inclusions in specific neurons, resulting in cell death. Here,we tested the ability of a natural heat-shock protein 90 inhibitor, Gedunin, to degrade transfected m HTT in Neuro-2 a cells and endogenous m HTT aggregates and intranuclear inclusions in both fibroblasts from HD patients and neurons derived from induced pluripotent stem cells from patients. Our data showed that Gedunin treatment degraded transfected m HTT in Neuro-2 a cells, endogenous m HTT aggregates and intranuclear inclusions in fibroblasts from HD patients, and in neurons derived from induced pluripotent stem cells from patients in a dose-and time-dependent manner, and its activity depended on the proteasomal pathway rather than the autophagy route. These findings also showed that although Gedunin degraded abnormal m HTT aggregates and intranuclear inclusions in cells from HD patient, it did not affect normal cells, thus providing a new perspective for using Gedunin to treat HD.展开更多
亨廷顿蛋白相关蛋白1 (Huntingtin-associated protein 1, Hap1)在神经系统中高表达,并与多种蛋白质相互作用。Hap1的功能包括囊泡运输、基因转录和信号转导等,与神经系统的诸多活动密切相关。本文综述了Hap1的结构与分布,总结了与Hap1...亨廷顿蛋白相关蛋白1 (Huntingtin-associated protein 1, Hap1)在神经系统中高表达,并与多种蛋白质相互作用。Hap1的功能包括囊泡运输、基因转录和信号转导等,与神经系统的诸多活动密切相关。本文综述了Hap1的结构与分布,总结了与Hap1相互作用并在神经活动中发挥重要作用的蛋白质,以及Hap1在相关神经系统疾病中作用的最新研究进展,为神经系统疾病的治疗提供新思路和新靶点。展开更多
文摘目的:探讨热休克蛋白70结合蛋白1(heat shock protein 70 binding protein 1,HspBP1)能否促进内源性突变亨廷顿蛋白(mutant Huntingtin,mHTT)在星形胶质细胞中积聚,并确定其是否能够介导病理性损伤。方法:在GFAP-HD转基因小鼠的星形胶质细胞中过表达HspBP1,通过免疫染色和蛋白印迹法检测mHTT和神经病理相关蛋白表达水平,并通过行为学实验观察小鼠的运动功能水平。结果:GFAP-HD转基因小鼠短期内即出现星形胶质细胞中的mHTT积聚以及运动功能障碍,但并未出现星形胶质细胞活化和神经元损伤。结论:HspBP1能够通过促进星形胶质细胞内源性mHTT积聚介导病理性损伤,但mHTT在神经元和星形胶质细胞中共同表达可能是神经元显著变性的必需条件。
基金supported by the National Key Research and Development Program of China (2018YFA0108004)the National Natural Science Foundation of China (81271259)
文摘Huntington's disease(HD) is a deadly neurodegenerative disease with abnormal expansion of CAG repeats in the huntingtin gene. Mutant Huntingtin protein(m HTT) forms abnormal aggregates and intranuclear inclusions in specific neurons, resulting in cell death. Here,we tested the ability of a natural heat-shock protein 90 inhibitor, Gedunin, to degrade transfected m HTT in Neuro-2 a cells and endogenous m HTT aggregates and intranuclear inclusions in both fibroblasts from HD patients and neurons derived from induced pluripotent stem cells from patients. Our data showed that Gedunin treatment degraded transfected m HTT in Neuro-2 a cells, endogenous m HTT aggregates and intranuclear inclusions in fibroblasts from HD patients, and in neurons derived from induced pluripotent stem cells from patients in a dose-and time-dependent manner, and its activity depended on the proteasomal pathway rather than the autophagy route. These findings also showed that although Gedunin degraded abnormal m HTT aggregates and intranuclear inclusions in cells from HD patient, it did not affect normal cells, thus providing a new perspective for using Gedunin to treat HD.
文摘亨廷顿蛋白相关蛋白1 (Huntingtin-associated protein 1, Hap1)在神经系统中高表达,并与多种蛋白质相互作用。Hap1的功能包括囊泡运输、基因转录和信号转导等,与神经系统的诸多活动密切相关。本文综述了Hap1的结构与分布,总结了与Hap1相互作用并在神经活动中发挥重要作用的蛋白质,以及Hap1在相关神经系统疾病中作用的最新研究进展,为神经系统疾病的治疗提供新思路和新靶点。
