大麻素受体信号取决于亚细胞位置
Alix Thomas1, Braden T Lobingier1, Carsten Schultz1
1Oregon Health and Science University, Department of Chemical Physiology and Biochemistry, Portland, OR, 97239, USA.
bioRxiv : the preprint server for biology
|April 2, 2024
概括
大麻素受体1 (CB1) 信号的位置取决于细胞膜. 研究人员发现细胞内CB1信号通过Gαi,而血膜CB1信号通过Gαs,可由促进器和标签控制.
科学领域:
- 细胞生物学 细胞生物学
- 分子药理学分子药理学
- 神经科学是一个神经科学.
背景情况:
- G蛋白结合受体 (GPCRs) 对人类生理学至关重要,信号传递发生在细胞表面和内部膜上.
- 人们越来越认识到,大麻素受体1 (CB1) 信号传递受其亚细胞局部的影响.
- 了解CB1的位置依赖信号是解读其复杂的生理作用的关键.
研究的目的:
- 研究细胞下局部化如何影响CB1受体信号传递.
- 确定促进体和基因标签在CB1定位和信号传递中的作用.
- 开发用于跟踪活细胞中CB1和CB2受体活性的新方法.
主要方法:
- 利用了具有不同促进子和N端标签的异质表达系统.
- 使用可遗传编码的非正规氨基酸 (ncAA) 来标记活细胞.
- 应用无铜点击化学与TCO*A用于光体附着CB1R和CB2R.
主要成果:
- 细胞内CB1受体主要通过Gαi发出信号;血受体通过Gαs发出信号.
- 强大的促进剂/N端标签驱动血局部化和Gαs信号传递.
- 低表达性促进剂/无标签导致内部膜局部化和Gαi信号传递.
- ncAA标记成功标记了CB1R和CB2R,而没有破坏信号传输或贩运.
结论:
- 亚细胞局部化极大地影响CB1受体信号通路 (Gαi与Gαs).
- 通过战略性促进者选择和遗传标记,可以对CB1定位和信号进行实验控制.
- 基于ncAA的新型标记策略能够精确跟踪活细胞中的大麻素受体动态.
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