Changes in dendritic complexity and spine morphology in transgenic mice expressing human wild-type tau.

Changes in dendritic complexity and spine morphology in transgenic mice expressing human wild-type tau.
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表达人类野生型Tau的转基因小鼠的树突复杂性和脊柱形态的变化。

DOI:
10.1007/s00429-010-0245-1
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发表时间:
2010-03
影响因子:
3.1
通讯作者:
Hof, Patrick R.
Hof, Patrick R.
中科院分区:
医学3区
文献类型:
--
作者:
Dickstein, Dara L.;Brautigam, Hannah;Stockton, Steven D., Jr.;Schmeidler, James;Hof, Patrick R.

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神经元缠结(NFT)由微管相关蛋白tau的不溶性、过度磷酸化聚集体组成,并且存在于各种神经退行性疾病中,包括阿尔茨海默病(AD)。为了研究tau蛋白在NFT形成和随后的神经变性过程中如何影响神经元功能,我们研究了表达野生型人tau蛋白(htau)的小鼠前额叶皮层第III层锥体神经元的形态、棘密度、棘类型和棘体积。在3个月、6个月和12个月大的htau小鼠中,顶端树突状乔木长度没有显著变化;然而,12个月大的小鼠表现出更复杂的树枝化模式。此外,我们观察到的变化,在棘形态与较少的蘑菇和更薄的刺在顶端和基底树突作为一个函数的htau积累。有趣的是,从3个月到12个月,脊柱体积总体下降。然而,蘑菇刺的体积从3到6个月减少,从6到12个月增加。12个月大的小鼠复杂性和分支的增加以及蘑菇刺体积的增加可能代表了剩余完整神经元的补偿机制。因此,磷酸化tau随时间的积累可能通过影响神经元结构和突触性质而导致AD中观察到的认知下降。树突和棘的这种改变可能导致AD中观察到的神经元功能的恶化,并为突触完整性和认知能力下降之间的关系提供了形态学基础。
Neurofibrillary tangles (NFTs) are composed of insoluble, hyperphosphorylated aggregates of the microtubule-associated protein tau and are present in various neurodegenerative diseases, including Alzheimer’s disease (AD). To investigate how tau affects neuronal function during NFT formation and subsequent neurodegeneration, we examined the morphology, spine density, spine type, and spine volume of layer III pyramidal neurons from the prefrontal cortex of mice expressing wild-type human tau (htau) over time. There were no significant alterations in apical dendritic arbor length in 3-, 6-, and 12-month-old htau mice; however, 12-month-old mice exhibited more complex arborization patterns. In addition, we observed a shift in spine morphology with fewer mushroom and more thin spines in both apical and basal dendrites as a function of htau accumulation. Interestingly, there was an overall decrease in volume of spines from 3 to 12 months. However, the volume of mushroom spines decreased from 3 to 6 months and increased from 6 to 12 months. This increase in complexity and branching in 12-month-old mice and the increase of volume of mushroom spines may represent compensatory mechanisms in the remaining intact neurons. As such, the accumulation of phosphorylated tau over time may contribute to the cognitive decline observed in AD by affecting neuronal structure and synaptic properties. Such alterations in dendrites and spines may result in the deterioration of neuronal function observed in AD, and provide a morphologic substrate for the relationship between synaptic integrity and cognitive decline.
tau 病理学 htau 小鼠模型中认知和突触功能的年龄依赖性损害。
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