Neuron-specific expression of tomosyn1 in the mouse hippocampal dentate gyrus impairs spatial learning and memory.

Neuron-specific expression of tomosyn1 in the mouse hippocampal dentate gyrus impairs spatial learning and memory.
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DOI:
10.1007/s12017-013-8223-4
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发表时间:
2013-06
影响因子:
3.5
通讯作者:
Ashery, Uri
Ashery, Uri
中科院分区:
医学3区
文献类型:
--
作者:
Barak, Boaz;Okun, Eitan;Ben-Simon, Yoav;Lavi, Ayal;Shapira, Ronit;Madar, Ravit;Wang, Yue;Norman, Eric;Sheinin, Anton;Pita, Mario A.;Yizhar, Ofer;Mughal, Mohamed R.;Stuenkel, Edward;van Praag, Henriette;Mattson, Mark P.;Ashery, Uri

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Tomosyn是一种syntaxin结合蛋白,已知通过干扰SNARE复合物的形成来抑制囊泡启动和突触传递。利用慢病毒载体,我们在成年小鼠海马齿状回神经元中特异性过表达tomosyn1。然后对小鼠进行空间学习和记忆任务,并对海马切片进行电生理测量。在Morris水迷宫测试中,tomosyn1过表达显著损害海马依赖的空间记忆。此外,与对照组小鼠相比,tomosyn1过表达小鼠在Morris水迷宫中使用认知能力较低的游泳策略。苔藓纤维- ca3突触的电生理测量显示,tomosyn1过表达小鼠的苔藓纤维配对脉冲促进功能受损。这项研究为tomosyn1在海马体依赖的空间学习和记忆中的新作用提供了证据,可能通过减少苔藓纤维- ca3突触的突触传递。此外,它还提供了关于海马齿状回和苔藓纤维- ca3突触在游泳策略偏好和学习记忆中的作用的新见解。
Tomosyn, a syntaxin-binding protein, is known to inhibit vesicle priming and synaptic transmission via interference with the formation of SNARE complexes. Using a lentiviral vector, we specifically overexpressed tomosyn1 in hippocampal dentate gyrus neurons in adult mice. Mice were then subjected to spatial learning and memory tasks and electrophysiological measurements from hippocampal slices. Tomosyn1-overexpression significantly impaired hippocampus-dependent spatial memory while tested in the Morris water maze. Further, tomosyn1-overexpressing mice utilize swimming strategies of lesser cognitive ability in the Morris water maze compared with control mice. Electrophysiological measurements at mossy fiber-CA3 synapses revealed impaired paired-pulse facilitation in the mossy fiber of tomosyn1-overexpressing mice. This study provides evidence for novel roles for tomosyn1 in hippocampus-dependent spatial learning and memory, potentially via decreased synaptic transmission in mossy fiber-CA3 synapses. Moreover, it provides new insight regarding the role of the hippocampal dentate gyrus and mossy fiber-CA3 synapses in swimming strategy preference, and in learning and memory.
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