Environmental enrichment improves hippocampal function in aged rats by enhancing learning and memory, LTP, and mGluR5-Homer1c activity.

Environmental enrichment improves hippocampal function in aged rats by enhancing learning and memory, LTP, and mGluR5-Homer1c activity.
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DOI:
10.1016/j.neurobiolaging.2017.11.004
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发表时间:
2018-03
影响因子:
4.2
通讯作者:
Burger C
Burger C
中科院分区:
医学2区
文献类型:
--
作者:
Cortese GP;Olin A;O'Riordan K;Hullinger R;Burger C

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我们实验室之前的研究表明,环境富集可以提高幼年大鼠的学习能力,并通过 p70S6 激酶的持续激活增强代谢型谷氨酸受体依赖性长期增强 (mGluR-LTP)。在这里,我们研究了 1 个月的环境丰富是否足以改善 23-24 月龄 Fischer 344 雄性大鼠的海马依赖性学习和记忆并增强海马 LTP。老年大鼠被安置在环境丰富(EE)、社会丰富(SE)或标准住房(SC)条件中。我们发现,在莫里斯水迷宫和新颖的物体识别行为任务中进行测试时,暴露于一个月环境丰富的老年大鼠相对于标准饲养对照组表现出更强的学习和记忆能力。此外,我们发现 EE 大鼠在径向臂水迷宫中的表现明显优于 SE 或 SC 大鼠,并且表现出增强的 mGluR5 依赖性海马 LTP。海马功能的增强是由于 mGluR5、Homer1c 和磷酸化 p70S6 激酶水平的活动依赖性增加所致。这些发现表明,老年大鼠短暂暴露于富集环境可以对海马功能产生显着影响。
Previous studies from our lab have shown that environmental enrichment in young rats results in improved learning ability and enhanced metabotropic glutamate receptor-dependent long term potentiation (mGluR-LTP) resulting from sustained activation of p70S6 kinase. Here we investigated whether 1-month environmental enrichment is sufficient to improve hippocampus-dependent learning and memory and enhance hippocampal LTP in 23–24 month old Fischer 344 male rats. Aged rats were housed in environmentally enriched (EE), socially enriched (SE), or standard housing (SC) conditions. We find that aged rats exposed to one month of environmental enrichment demonstrate enhanced learning and memory relative to standard housed controls when tested in the Morris water maze and novel object recognition behavioral tasks. Furthermore, we find that EE rats perform significantly better than SE or SC rats in the radial-arm water maze, and display enhanced mGluR5-dependent hippocampal LTP. Enhanced hippocampal function results from activity-dependent increases in the levels of mGluR5, Homer1c, and phospho-p70S6 kinase. These findings demonstrate that a short exposure of environmental enrichment to aged rats can have significant effects on hippocampal function.
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