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从SI/nBM到mPFC的胆固醇投射有选择性地调节时间顺序识别记忆
Fan Mei1, Chen Zhao2, Shangjin Li2
1Institute of Systems Biomedicine, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China.
神经生长因子受体 (NGFR) 阳性胆能神经元在Meynert-medial前额叶皮质电路的 substantia innominate/nucleus basalis 中,对于时间顺序记忆至关重要. NGFR信号调节乙胆释放和神经元刺激性,影响最近的判断.
科学领域:
- 神经科学是一个神经科学.
- 认知神经科学 认知神经科学
- 分子机制的分子机制
背景情况:
- 乙胆对于通过胆性通路的认知功能至关重要.
- 识别记忆的特定胆固醇电路和分子支柱尚未得到充分理解.
研究的目的:
- 研究特定胆固醇子群和电路在识别记忆中的作用,特别是时间顺序判断.
- 阐明涉及神经生长因子受体 (NGFR) 在这些过程中的分子机制.
主要方法:
- 在ChAT-Cre小鼠中使用了Ngfr淘汰赛小鼠 (Ngfr-/-) 和选择性基因操纵 (化遗传学,光遗传学).
- 采用纤维光度测量在中间前额叶皮层 (mPFC) 中测量乙胆释放.
- 评估时间顺序记忆,新型对象识别和对象位置识别.
主要成果:
- Ngfr-/-小鼠表现出时间顺序记忆受损,但完整的新物体和位置识别.
- 失去了NGFR降低了Meynert (nBM) -mPFC电路的substantia innominate (SI) /基底核中的胆神经元刺激性,减少了mPFC中的乙胆释放.
- 降低胆固醇活性会通过KCC2破坏GABAergic信号传输,通过增强乙胆信号传输来挽救该信号传输.
结论:
- 依赖NGFR的SI/nBM-mPFC胆固醇电路对于时间顺序识别记忆至关重要.
- NGFR信号调节胆固醇神经元活动,乙胆释放和GABAergic突触功能,共同支持最近的判断.
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