Tau assemblies do not behave like independently acting prion-like particles in mouse neural tissue

Tau assemblies do not behave like independently acting prion-like particles in mouse neural tissue
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Tau 蛋白组装体的行为与小鼠神经组织中独立作用的朊病毒样颗粒不同

DOI:
10.1101/2021.01.13.426340
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发表时间:
2021
期刊:
--
影响因子:
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通讯作者:
Mukadam A
Mukadam A
中科院分区:
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文献类型:
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作者:
Mukadam A

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传染性病原体的一个基本特性是它们的颗粒性质:传染性来自独立作用的颗粒,而不是集体作用的结果。tau蛋白的组装可以表现出播种行为,这可能是许多神经退行性疾病中tau聚集的明显扩散的基础。在这里,我们问是否tau组件与经典的病原体的颗粒行为的特征。我们使用来自P301S tau转基因小鼠的器官型海马切片培养物,以精确控制细胞外tau组装体的浓度。虽然未处理的切片没有显示明显的病理学迹象,但暴露于tau组装体可能导致神经元内过度磷酸化tau结构的形成。然而,tau组装体的接种能力在神经组织中不以一次命中的方式滴定。结果表明,tau的接种行为仅在超生理浓度下出现,这对解释高剂量颅内激发实验以及接种聚集对人类疾病的可能贡献具有影响。
A fundamental property of infectious agents is their particulate nature: infectivity arises from independently-acting particles rather than as a result of collective action. Assemblies of the protein tau can exhibit seeding behaviour, potentially underlying the apparent spread of tau aggregation in many neurodegenerative diseases. Here we ask whether tau assemblies share with classical pathogens the characteristic of particulate behaviour. We used organotypic hippocampal slice cultures from P301S tau transgenic mice in order to precisely control the concentration of extracellular tau assemblies. Whilst untreated slices displayed no overt signs of pathology, exposure to tau assemblies could result in the formation of intraneuronal, hyperphosphorylated tau structures. However, seeding ability of tau assemblies did not titrate in a one-hit manner in neural tissue. The results suggest that seeding behaviour of tau only arises at supra-physiological concentrations, with implications for the interpretation of high-dose intracranial challenge experiments and the possible contribution of seeded aggregation to human disease.
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