Pathogenic tau recruits wild-type tau into brain inclusions and induces gut degeneration in transgenic SPAM mice.

Pathogenic tau recruits wild-type tau into brain inclusions and induces gut degeneration in transgenic SPAM mice.
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DOI:
10.1038/s42003-022-03373-1
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发表时间:
2022-05-12
影响因子:
5.9
通讯作者:
--
中科院分区:
生物学2区
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--
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病理性tau包涵体是许多神经退行性疾病的神经病理特征。我们建立并鉴定了一个表达致病人tau的转基因小鼠模型,该模型含有S320F和P301S聚集性突变(SPAM),转基因水平低于内源性小鼠tau蛋白水平。这种小鼠模型在大脑中发展出一种可预测的tau病理过程,具有类似于真实tau包涵体的生化和超微结构特性。令人惊讶的是,致病的人类tau广泛地招募内源性的小鼠tau形成不可溶的聚集体。尽管tau病理起病早,进展快,但主要的神经炎性和转录变化只有在较晚的时间点才能检测到。此外,tau垃圾小鼠是第一个由于tau积聚而导致致死性表型的肠道神经元丢失的模型。由于适度的转基因表达,快速发展的tau病理,以及高度可预测的致死表型,tau垃圾邮件模型揭示了tau在大脑和肠道中的神经毒性的新关联。提出了一种具有可预测的致病tau蛋白进程的小鼠模型,使进一步研究tau在神经退行性疾病中的病理学成为可能。
Pathological tau inclusions are neuropathologic hallmarks of many neurodegenerative diseases. We generated and characterized a transgenic mouse model expressing pathogenic human tau with S320F and P301S aggregating mutations (SPAM) at transgene levels below endogenous mouse tau protein levels. This mouse model develops a predictable temporal progression of tau pathology in the brain with biochemical and ultrastructural properties akin to authentic tau inclusions. Surprisingly, pathogenic human tau extensively recruited endogenous mouse tau into insoluble aggregates. Despite the early onset and rapid progressive nature of tau pathology, major neuroinflammatory and transcriptional changes were only detectable at later time points. Moreover, tau SPAM mice are the first model to develop loss of enteric neurons due to tau accumulation resulting in a lethal phenotype. With moderate transgene expression, rapidly progressing tau pathology, and a highly predictable lethal phenotype, the tau SPAM model reveals new associations of tau neurotoxicity in the brain and intestinal tract. A mouse model with a predictable pathogenic tau protein progression is presented, enabling further investigation into tau pathology in neurodegenerative diseases.
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