Pharmacological inhibition of asparaqinyl endopeptidase by δ-secretase inhibitor 11 mitigates Alzheimer's disease-related pathologies in a senescence-accelerated mouse model  

作　　者：Ju Wang Hui-Jie Hu Zi-Kai Liu Jing-Jing Liu Shan-Shan Wang Qing Cheng Hong-Zhuan Chen Mingke Song 

机构地区：[1]Department of Pharmacology and Chemical Biology,Institute of Medical Sciences,Shanghai Jiao Tong University School of Medicine,Shanghai 200025,China [2]Institute of Interdisciplinary Integrative Biomedical Research,Shanghai University of Traditional Chinese Medicine,Shanghai 201210,China

出　　处：《Translational Neurodegeneration》2021年第1期140-149,共10页转化神经变性病（英文）

基　　金：supported by the National Natural Science Foundation of China(81671375,91949116 and 81873807);Innovative Research Team of High-level Local Universities in Shanghai,China.

摘　　要：Background:Currently,there is no cure for Alzheimer's disease(AD).Therapeutics that can modify the early stage of AD are urgently needed.Recent studies have shown that the pathogenesis of AD is closely regulated by an endo/lysosomal asparaginyl endopeptidase(AEP).Inhibition of AEP has been reported to prevent neural degeneration in transgenic mouse models of AD.However,more than 90% of AD cases are age-related sporadic AD rather than hereditary AD.The therapeutic efficacy of AEP inhibition in ageing-associated sporadic AD remains unknown.Methods:The senescence-accelerated mouse prone 8(SAMP8)was chosen as an approximate model of sporadic AD and treated with a selective AEP inhibitor,δ-secretase inhibitor 11.Activation of AEP was determined by enzymatic activity assay.Concentration of soluble amyloid β(Aβ)in the brain was determined by ELISA.Morris water maze test was performed to assess the learning and memory-related cognitive ability.Pathological changes in the brain were explored by morphological and western blot analyses.Results:The enzymatic activity of AEP in the SAMP8 mouse brain was significantly higher than that in the agematched SAMR1 mice.The half maximal inhibitory concentration(IC_(50))for δ-secretase inhibitor 11 to inhibit AEP in vitro was around 150 nM.Chronic treatment with δ-secretase inhibitor 11 markedly decreased the brain AEP activity,reduced the generation of Aβ_(1-40/42) and ameliorated memory loss.The inhibition of AEP with this reagent not only reduced the AEP-cleaved tau fragments and tau hyperphosphorylation,but also attenuated neuroinflammation in the form of microglial activation.Moreover,treatment with 6-secretase inhibitor 11 prevented the synaptic loss and alleviated dendritic disruption in SAMP8 mouse brain.Conclusions:Pharmacological inhibition of AEP can intervene and prevent AD-like pathological progress in the model of sporadic AD.The up-regulated AEP in the brain could be a promising target for early treatment of AD.The δ-secretase inhibitor 11 can be used as a lead c

关 键 词：Alzheimer's disease Asparaginyl endopeptidase LEGUMAIN SAMP8 mouse δ-Secretase inhibitor 11 Therapeutic target 

分 类 号：R749.16[医药卫生—神经病学与精神病学]