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基底前脑胆固醇投射神经元的不同种群对威胁记忆的功能精细编码
Prithviraj Rajebhosale1, Mala R Ananth1, Ronald Kim1
1National Institute of Neurological Disorders and Stroke, NIH, Bethesda, United States.
eLife
|February 16, 2024
概括
基底前脑中的胆神经元学习刺激和脚震之间的关联,在杏仁体中释放乙胆以回忆记忆. 不同的胆协神经元群体会发出不同的厌恶刺激信号,显示有组织的记忆处理.
科学领域:
- 神经科学是一个神经科学.
- 神经生物学 神经生物学 神经生物学
- 分子生物学分子生物学
背景情况:
- 从基底前脑,特别是基底核和无名物质 (NBM/SIp) 的胆固醇投射对杏仁体功能至关重要.
- 底侧杏仁体 (BLA) 接收大量胆性输入,在学习和记忆中发挥作用.
研究的目的:
- 研究NBM/SIp胆能神经元在关联性学习和记忆回忆中的作用.
- 为了确定不同的胆固醇人群是否对已学到的与先天的厌恶性刺激做出反应.
主要方法:
- 在小鼠中使用了基因编码的乙胆 (ACh) 传感器来监测胆活性.
- 采用即时早期基因 (Fos) 表达来识别激活的神经元.
- 使用化学遗传学来使特定的神经元群体沉默.
- 呈现了有条件的听觉刺激和天生的捕食者气味刺激.
主要成果:
- 投射BLA的NBM/SIp胆能神经元学会了将声音与足部的冲击联系起来,并在回忆过程中释放了ACh.
- 激活的NBM/SIp神经元显示内在刺激能力增加.
- 沉默这些神经元会损害防御行为回忆.
- 捕食者气味没有激活NBM/SIp神经元;相反,VP/SIa神经元被激活.
结论:
- 在基底前脑中,不同的胆协神经元群体被差异性地招募来信号学习和先天的厌恶刺激.
- 这突出了胆固醇基底前脑内功能精细的记忆处理组织.
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