内体大麻素传感器的药理特性 GRABeCB2.0
Simar Singh1,2,3, Dennis Sarroza1, Anthony English1,2,3
1Department of Pharmacology, Pain, and Emotion, School of Medicine, University of Washington, Seattle, Washington, USA.
Cannabis and cannabinoid research
|December 8, 2023
概括
基因编码的传感器GRABeCB2.0对内分泌素 (eCB) 和植物性大麻素作出反应,其药理学特征现在已经被描述. 这项研究阐明了GRABeCB2.0如何信号eCB水平的变化,从而提高了它在大麻素研究中的实用性.
科学领域:
- 神经科学是一个神经科学.
- 药理学 药理学是指药理学的学科.
- 生物化学 生物化学
背景情况:
- 内分类固醇 (eCB),2-阿拉基多诺伊尔甘油醇 (2-AG) 和阿拉基多诺伊尔乙醇胺 (AEA) 是具有独特药理特征的关键信号分子.
- 基因编码的传感器GRABeCB2.0能够实时检测eCB水平,但其对类似物和植物性大麻素的反应没有特征.
- 了解GRABeCB2.0激活对于解释其在临床前和体内药理学研究中的有用性至关重要,特别是对于植物性大麻素作用.
研究的目的:
- 描述GRABeCB2.0传感器由内源性eCB,eCB类似物和植物性大麻素的激活概况.
- 确定各种配体在GRABeCB2.0中的强度,并将它们与它们在大麻素受体 (CB1R) 中已知的强度进行比较.
- 评估GRABeCB2.0的潜力,以反映大麻 (CBD) 等化合物的全调节性质.
主要方法:
- 在HEK293细胞中表达了GRABeCB2.0用于功能特征.
- 使用活细胞共聚焦显微镜和高通量光信号测量.
- 对各种eCBs,类似物,植物性大麻素和CB1R配体生成了剂量反应曲线.
主要成果:
- 2-AG和SR141716 (SR1) 调节了GRABeCB2.0信号,其功率反映了它们的CB1R活性 (EC50=85nM和IC50=3.3nM,分别).
- 艾亚,eCB类似物 (2-linoleoylglycerol,2-oleoylglycerol),Δ9THC,Δ8THC和CP55,940 (CP) 增加了GRABeCB2.0信号,但其强度低于CB1R.
- 大麻醇 (CBD) 抑制了2-AG刺激的GRABeCB2.0反应 (IC50=9.7 nM),而没有影响基底信号,这表明保留了负调节器 (NAM) 特性.
结论:
- 通过2-AG和SR1激活GRABeCB2.0,准确地反映了它们的CB1R功效.
- 与CB1R相比,传感器对AEA,eCB类似物,THC和CP的强度发生了变化,需要仔细解释.
- GRABeCB2.0保留了CBD在CB1R的负基调节器特性,为研究大麻素药理学提供了有价值的工具.
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