再聚合的丘脑在中间前额叶皮层中招募反复激发
Gil Vantomme1, Gabrielle Devienne1, Jacob M Hull1
1Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA.
bioRxiv : the preprint server for biology
|June 10, 2024
概括
胸膜重聚核 (Re) 通过一种新的循环途径激发中部前额叶皮质 (mPFC). 这种放大系统可以通过增强背部CA1信号到mPFC,对记忆形成和检索至关重要.
科学领域:
- 神经科学是一个神经科学.
- 系统神经科学 系统神经科学
- 突触性可塑性 突触性可塑性
背景情况:
- 中间前额叶皮质 (mPFC) 和海马体对于记忆和决策等认知功能至关重要.
- 海马和mPFC之间的直接和间接路径的功能连接仍然不完全理解.
- thalamus 的 Reuniens 核 (Re) 是从背部 CA1 (dCA1) 到 mPFC 的间接通路的关键组成部分.
研究的目的:
- 为了研究Re-mPFC通路的功能性突触操作.
- 阐明Re-mPFC网络在信号放大和信息处理中的作用.
主要方法:
- 使用体内和体外电生理学,包括全细胞补丁和局部场电位记录.
- 用光遗传学来针对性地操纵神经活动.
- 在清醒,头部固定的小鼠中进行了体内神经像素记录.
主要成果:
- 重新mPFC突触表现出单突触刺激和异突触前抑制,以及一种新的长期反复刺激.
- 再激活会在mPFC中的皮质层中诱导持续的突触活动.
- 阻断GABAergic抑制增强了重新唤起的兴奋,表明一个反复放大机制.
- 在体内记录证实了通过Re刺激对mPFC单元的长时间激发.
结论:
- 该Re-mPFC通路作为一个强大的放大系统,可能增强dCA1信号到mPFC.
- 观察到的反复激发和高的突触增益可能有助于巧合的检测,并有助于记忆的形成和检索.
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