乙胆与独特的杏仁体微电路接触,以进入内部太节律
Joshua X Bratsch-Prince1, James W Warren1, Grace C Jones1
1Department of Pharmacology, Physiology & Neuroscience, University of South Carolina School of Medicine, Columbia, South Carolina 29208.
概括
乙胆 (ACh) 通过胆囊托基宁内部神经元触发底侧杏仁体 (BLA) 中的甲基振荡,促进情绪记忆. 这种机制揭示了突出刺激如何增强大脑状态以形成记忆.
科学领域:
- 神经科学是一个神经科学.
- 神经生理学 神经生理学
- 分子生物学分子生物学
背景情况:
- 来自基底前脑神经元的乙胆 (ACh) 通过诱导与乙太振荡相关的大脑状态来调节注意力和记忆.
- 基底侧杏仁体 (BLA) 中的theta振荡与情感记忆有关,但根本的机制尚未完全理解.
研究的目的:
- 阐明乙胆 (ACh) 诱导底侧桃体 (BLA) 中的甲基振荡的细胞和电路机制.
- 调查特定的内部神经元群体和肌肉蛋白受体在产生ACH诱导的BLA θ 振荡中的作用.
主要方法:
- 在体外大脑切片电生理学在雄性和雌性小鼠.
- 用乙胆 (ACh) 进行刺激,并评估BLA中的局部现场潜力.
- 药理学操纵针对M3肌酸受体和特定内部神经元群体 (CCK,SOM,PV).
主要成果:
- 大量的 ACh 刺激会在 BLA 局部场势中引起长时间的 teta 振荡.
- ACh诱导的需要M3肌糖受体激活胆固醇基因素 (CCK) 内神经元,独立于外部谷氨酸.
- 一个功能电路涉及体静止素 (SOM) 内神经元抑制CCK内神经元门 BLA 甲,与ACH抑制SOM INs.
- 参与基线振荡的帕尔瓦胺 (PV) 内神经元不需要用于ACH诱导的,这表明细胞切换.
- 与皮质或海马相比,theta活动在BLA中更容易引起.
结论:
- 乙胆 (ACh) 诱导BLA中的细胞开关,通过CCK内部神经元建立内部驱动的甲基振荡.
- 一个SOM→CCK内部神经元电路将这些ACH诱导的BLA中的theta振荡关闭.
- 这种机制表明,突出的刺激如何通过 ACh 将 BLA 转移到有利于情感记忆形成的网络状态.
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