持续的防御状态的刺激特定的下丘脑编码
Ann Kennedy1, Prabhat S Kunwar1,2, Ling-Yun Li1
1Division of Biology and Biological Engineering, Tianqiao and Chrissy Chen Institute for Neuroscience, California Institute of Technology, Pasadena, CA, USA.
Nature
|September 17, 2020
概括
中腹下丘脑 (VMHdm) SF1神经元中持续的神经活动是小鼠持久恐惧状态的基础. 这项研究揭示了特定于刺激的下丘脑动态驱动长时间的情绪反应,与工作记忆不同.
科学领域:
- 神经科学是一个神经科学.
- 情感的神经生物学 情感的神经生物学
- 下丘脑的功能 下丘脑的功能
背景情况:
- 已知持续的神经活动会调解皮质和海马网络中的工作记忆.
- 内部情绪状态,如恐惧,在刺激暴露后也会持续存在,但根本的神经动力学并未得到充分理解.
- 在中腹下垂体 (VMHdm) 中表达NR5A1 (SF1) 的神经元对于防御行为至关重要.
研究的目的:
- 调查缓慢的神经动力学是否与持续的情绪状态有关,特别是恐惧.
- 检查VMHdm SF1神经元在调解持续的防御行为和情绪状态中的作用.
- 阐明在下丘脑中持续的神经活动的机制和刺激特异性.
主要方法:
- 在小鼠中,VMHdm SF1神经元的光遗传激活和刺激.
- 微内镜成像以记录神经活动 in vivo.
- 在急性脑部切片中进行成像,以研究局部神经元连接.
- 行为测试 (开放场) 来评估防御反应.
- 计算建模用于分析神经动态.
主要成果:
- VMHdm SF1神经元在对自然威胁的反应中表现出持续活动,持续几十秒钟.
- 这种持续的活动与持续的防御行为相关,并且对持续的防御行为是必要的.
- 不同的VMHdm SF1亚群被不同的威胁模式激活,表明刺激特异性.
- 在VMHdm SF1神经元之间存在局部激发性连接.
- 持续的活动反映了人口层面上个体神经元之间的异质动态.
结论:
- VMHdm SF1神经元表现出特定于刺激的,缓慢的神经动态,有助于持续的情绪状态,如恐惧.
- 这些下丘脑动态在一个更长的时间范围内运行,而不是工作记忆中所涉及的动态.
- 这些发现揭示了持续情绪体验的神经基础的新机制.
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