Motor and cognitive deficits in aged tau knockout mice in two background strains.

Motor and cognitive deficits in aged tau knockout mice in two background strains.
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DOI:
10.1186/1750-1326-9-29
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发表时间:
2014-08-14
影响因子:
15.1
通讯作者:
Bush AI
Bush AI
中科院分区:
医学1区
文献类型:
--
作者:
Lei P;Ayton S;Moon S;Zhang Q;Volitakis I;Finkelstein DI;Bush AI

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我们最近报道了在B16/129 sv混合背景的tau-/-小鼠中,帕金森病和痴呆表型在7-12个月龄之间出现。这些观察结果被另一组使用纯B16背景tau-/-小鼠部分复制,但值得注意的是,它们没有观察到认知表型。使用B16背景tau-/-小鼠的第三组在20个月大时发现认知障碍。为了协调观察结果,在此我们考虑了两项研究中的遗传、饮食和环境变量,并对12个月大的tau+/+、tau+/-和tau-/-小鼠进行了一组扩展的行为研究,将B16/129 sv与B16背景进行比较。我们发现,tau-/-在这两种背景下表现出减少酪氨酸羟化酶阳性黑质神经元和受损的运动功能,在所有使用的测定,这是改善口服治疗左旋多巴,而不是混淆的体重变化。C57 BL 6/SV 129背景中的Tau-/-在Y-迷宫认知任务中表现出缺陷,但B16背景中的小鼠没有。这些结果验证了我们之前关于老年tau-/-小鼠神经退行性表型的报告,并表明遗传背景可能影响这些小鼠的认知障碍程度。因此,在AD的治疗策略中应避免过度降低tau。
We recently reported that Parkinsonian and dementia phenotypes emerge between 7-12 months of age in tau-/- mice on a Bl6/129sv mixed background. These observations were partially replicated by another group using pure Bl6 background tau-/- mice, but notably they did not observe a cognitive phenotype. A third group using Bl6 background tau-/- mice found cognitive impairment at 20-months of age. To reconcile the observations, here we considered the genetic, dietary and environmental variables in both studies, and performed an extended set of behavioral studies on 12-month old tau+/+, tau+/-, and tau-/- mice comparing Bl6/129sv to Bl6 backgrounds. We found that tau-/- in both backgrounds exhibited reduced tyrosine hydroxylase-positive nigral neuron and impaired motor function in all assays used, which was ameliorated by oral treatment with L-DOPA, and not confounded by changes in body weight. Tau-/- in the C57BL6/SV129 background exhibited deficits in the Y-maze cognition task, but the mice on the Bl6 background did not. These results validate our previous report on the neurodegenerative phenotypes of aged tau-/- mice, and show that genetic background may impact the extent of cognitive impairment in these mice. Therefore excessive lowering of tau should be avoided in therapeutic strategies for AD.
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