急性抑制压力会损害厌恶性记忆保留,但不会损害记忆形成
Aline Lima Dierschnabel1, Diana Aline Nôga1,2, Luiz Eduardo Mateus Brandão1,3
1Laboratory of Neurochemical Studies, Physiology and Behaviour Department, Post-Graduation Program in Psychobiology, Federal University of Rio Grande do Norte (UFRN), Natal 59078-970, Brazil.
Biology
|September 27, 2025
概括
训练后的急性克制压力 (ARS) 通过破坏Zif268和C-fos信号传递,损害了老鼠的长期记忆. 压力会影响记忆的回忆,而不是最初的形成.
科学领域:
- 神经科学是一个神经科学.
- 行为神经科学 行为神经科学
- 分子生物学分子生物学
背景情况:
- 压力显著影响神经化学信号通路,影响诸如记忆处理等认知功能.
- 精确的神经生物学机制,通过压力影响记忆,特别是长期保留,仍然不完全理解.
研究的目的:
- 调查急性克制压力 (ARS) 对长期保留厌恶记忆的特定影响.
- 阐明神经元活动标志物C-fos和Zif268在压力诱导的记忆障碍中的作用.
主要方法:
- 成年雄性大鼠在接受加迷宫歧视性回避任务 (PMDAT) 训练后立即接受处理或急性克制压力 (ARS).
- 免疫组织化学被用来评估神经元激活,特别是测量C-fos和Zif268表达在海马的背部CA1区域.
- 使用PMDAT评估记忆保留,遵循压力或处理协议.
主要成果:
- 在训练后立即使用ARS并没有影响初始记忆形成,但显著影响了长期记忆的保留.
- 训练诱导了训练后1小时C-fos表达的短暂峰值,并在背部CA1.1中延迟18小时Zif268的增加.
- 通过ARS后训练,可以消除延迟的Zif268增加并改变C-fos反应,这表明对记忆巩固所需的关键分子信号通路的破坏.
- 该研究表明,Zif268和C-fos信号在PMDAT中维持长期厌恶记忆 (LTM) 中具有关键作用.
结论:
- 急性克制压力在损害记忆保留方面起到的作用比起初始形成的歧视性厌恶记忆更为重要.
- 这些发现强调,压力引起的特定分子信号级联的破坏,特别是背部CA1中的Zif268和C-fos,是长期记忆保留缺陷的基础.
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