Pyroglutamate-Modified Amyloid-β Protein Demonstrates Similar Properties in an Alzheimer's Disease Familial Mutant Knock-In Mouse and Alzheimer's Disease Brain

Pyroglutamate-Modified Amyloid-β Protein Demonstrates Similar Properties in an Alzheimer's Disease Familial Mutant Knock-In Mouse and Alzheimer's Disease Brain
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焦谷氨酸修饰的淀粉样β蛋白在阿尔茨海默病家族突变基因敲入小鼠和阿尔茨海默病大脑中表现出类似的特性

DOI:
10.1159/000353634
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发表时间:
2013
影响因子:
3
通讯作者:
M. Savage
M. Savage
中科院分区:
医学4区
文献类型:
--
作者:
Guoxin Wu;Ron Miller;Brett Connolly;Jacob N. Marcus;J. Renger;M. Savage

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背景资料:N末端截短、焦谷氨酸修饰的β淀粉样蛋白(Aβ)肽是阿尔茨海默病(AD)中淀粉样蛋白沉积的主要成分。研究方法:应用新近建立的Aβ 3位谷氨酸修饰的焦谷氨酸酶联免疫吸附试验(pE 3A β),在携带淀粉样前体蛋白(APP)-KM 670/671 NL和早老素1(PS1)-P264 L双敲入的AD小鼠模型中,对人AD脑内pE 3A β进行了表征(APP/PS1-dKI)突变的小鼠模型,以及人APP 695与APP-KM 670/671 NL(Tg 2576)转基因过表达的第二种小鼠模型。结果:与年龄匹配的对照组相比,AD脑中的pE 3A β增加,pE 3A β/总Aβ分别为45%和10%。与对照组相比,AD脑中的pE 3A β增加了8.5倍,而非pE 3A β物质增加了2.7倍。在APP/PS1-dKI脑中,pE 3A β/总Aβ从3个月时的7%分别增加至15和19个月时的16%和19%。在Tg 2576中,19个月时pE 3A β/总Aβ仅为1.5%,表明APP/PS1-dKI尽管在相当年龄时总Aβ低于Tg 2576,但更接近模拟AD脑病理学。结论:该报告通过证实pE 3A β代表AD脑内Aβ的大部分,支持pE 3A β在AD发病机制中的重要作用。与年龄匹配的对照脑相比,pE 3A β的增加程度高于没有这种N端修饰的Aβ种类。此外,与Tg 2576模型相比,APP/PS1-dKI模型在这方面更接近于AD脑。
Background: N-terminally truncated, pyroglutamate-modified amyloid-β (Aβ) peptides are major constituents of amyloid deposits in Alzheimer's disease (AD). Methods: Using a newly developed ELISA for Aβ modified at glutamate 3 with a pyroglutamate (pE3Aβ), brain pE3Aβ was characterized in human AD in an AD mouse model harboring double knock-in amyloid precursor protein (APP)-KM670/671NL and presenilin 1 (PS1)-P264L (APP/PS1-dKI) mutations, and in a second mouse model with transgenic overexpression of human APP695 with APP-KM670/671NL (Tg2576). Results: pE3Aβ increased in the AD brain versus age-matched controls, with pE3Aβ/total Aβ at 45 and 10%, respectively. Compared to controls, the AD brain demonstrated 8.5-fold increased pE3Aβ compared to non-pE3Aβ species, which increased 2.7-fold. In the APP/PS1-dKI brain, pE3Aβ/total Aβ increased from 7% at 3 months to 16 and 19% at 15 and 19 months, respectively. In Tg2576, pE3Aβ/total Aβ was only 1.5% at 19 months, suggesting that APP/PS1-dKI, despite less total Aβ compared to Tg2576 at comparable ages, more closely mimics AD brain pathology. Conclusion: This report supports a significant role for pE3Aβ in AD pathogenesis by confirming that pE3Aβ represents a large fraction of Aβ within the AD brain. Compared to the age-matched control brain, pE3Aβ increased to a greater extent compared to Aβ species without this N-terminal modification. Further, the APP/PS1-dKI model more closely resembles the AD brain in this regard, compared to the Tg2576 model.
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