在CB1R激活下,通过actomyosin介导抑制突触囊释放
Maureen H McFadden1,2, Michel-Boris Emeritt3, Hao Xu4
1Institut Pasteur, Université Paris Cité, Synapse and Circuit Dynamics Laboratory, CNRS UMR 3571, Paris, France.
Translational psychiatry
|August 21, 2024
概括
类型-1大麻素受体 (CB1R) 的激活需要神经元的actomyosin收缩性,以长期保持大脑的可塑性. 抑制非肌肉肌肉蛋白II (NMII) 和ROCK恢复了突触囊泡的释放,揭示了一个新的可塑性机制.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 长期的突触可塑性对大脑功能至关重要.
- 功能性可塑性的前突触机制尚未完全理解.
- 大麻素1型受体 (CB1R) 是大脑中广泛存在的G蛋白结合受体.
研究的目的:
- 研究CB1R诱导的突触可塑性的突触前机制.
- 阐明神经元中actomyosin细胞骨在CB1R功能中的作用.
主要方法:
- 合成素-pHluorin (sypH2) 探针用于突触囊释放.
- 3D STORM超高分辨率显微镜用于囊泡分布.
- 切片电生理学用于突触可塑性评估.
- 抑制非肌肉肌肉酶II (NMII) 和Rho相关激酶 (ROCK).
主要成果:
- 通过NMII和ROCK抑制剂,可以防止CB1R激活引起的突触囊释放的减少.
- CB1R的激活导致了依赖于actomyosin的突触囊泡的重新分配和聚类.
- 抑制NMII和ROCK可以恢复由CB1R激活抑制的容易释放的池囊释放.
- 对于长期而不是短期的CB1R诱导的皮层-状突触的可塑性,NMII和ROCK是必要的.
结论:
- 通过CB1R激活,通过actomyosin细胞骨收缩诱导长期的突触抑郁.
- 这种收缩会重组预突触囊泡池,抑制释放.
- 提出了CB1R介导的前突触可塑性的一种新机制.
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