在CA2金字塔细胞和帕瓦胺表达细胞上的围神经网络对海马体依赖记忆的不同调节
Georgia M Alexander1, Viktoriya D Nikolova2, Tristan M Stöber3,4
1Neurobiology Laboratory, National Institute of Environmental Health Sciences, Division of Intramural Research, National Institute of Health, Research Triangle Park, North Carolina 27713, USA.
bioRxiv : the preprint server for biology
|November 22, 2024
概括
特定海马神经元上的周围神经网络 (PNN) 在记忆中发挥着不同的作用. 从CA2金字塔细胞中删除PNN会损害社会记忆,而从parvalbumin (PV) 内神经元中删除PNN会影响恐惧记忆.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 行为科学 行为科学
背景情况:
- 围神经网络 (PNN) 是围绕特定神经元的细胞外矩阵,包括CA2金字塔细胞和帕瓦胺 (PV) 内神经元.
- PNN与调节突触可塑性,学习和记忆有关.
- 目前的方法,如ondroitinase降解,不能在不同的神经元群体上区分PNN功能.
研究的目的:
- 调查PNN在CA2金字塔细胞和PV内部神经元在调节行为的特定作用.
- 解开不同海马细胞类型中PNN对社会,恐惧和空间记忆以及逆向学习的贡献.
主要方法:
- 产生的有条件淘汰赛小鼠缺乏关键PNN成分aggrecan (Acan),特别是在CA2金字塔细胞 (Amigo2 Acan KO) 或PV细胞 (PV Acan KO) 中.
- 在雄性和雌性KO和野生类型小鼠中评估了社会记忆,恐惧记忆,空间记忆和逆转学习.
- 研究了Amigo2 Acan KO小鼠社会记忆缺陷的神经电路机制,包括对CA2的超母细胞核 (SuM) 输入和与社会新奇相关的神经反应.
主要成果:
- Amigo2 Acan KO小鼠在社交记忆和逆向学习方面表现出缺陷,而PV Acan KO小鼠表现出情境恐惧记忆受损.
- 这些结果表明PNN在海马体依赖的记忆过程中的细胞类型特异性功能.
- Amigo2 Acan KO小鼠对CA2的SuM输入减少,缺乏与社会新奇相关的本地现场潜在反应,这表明PNN协调功能连接和对社会新奇的反应.
结论:
- 在CA2金字塔细胞和PV内部神经元上的PNN在调节特定类型的海马依赖记忆方面发挥着不同的独立作用.
- 在CA2神经元上的PNN对于社会记忆和逆向学习至关重要,可能通过协调与社会新奇相关的输入.
- 在PV内部神经元上的PNN对于上下文恐惧记忆至关重要.
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