大麻素CB1受体的正异质调节增强了内分泌大麻素信号传递,并改变了ERK1/2酸化动力学
Hayley M Green1, Jamie J Manning1, Ian R Greig2
1Department of Pharmacology and Toxicology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand.
British journal of pharmacology
|June 4, 2024
概括
积极的全调节剂 (PAMs) 激活了没有内源配体的大麻素受体1 (CB1),可能会改变信号传输. 这些CB1全性激动剂在体内没有保留内分泌素的时空信号传递.
科学领域:
- 药理学 药理学是指药理学的学科.
- 神经科学是一个神经科学.
- 分子生物学分子生物学
背景情况:
- 外源激动剂激活大麻素受体1 (CB1) 可能会引起不良影响.
- 积极的全osteric调制 (PAM) 的CB1可能提供更好的治疗潜力与较少的不良影响与orthosteric激动剂相比.
- 对PAMs降低脱敏和耐受性的潜力尚未直接测试.
研究的目的:
- 研究CB1正调节剂 (PAMs) 和ago-PAMs诱导受体调节通路的能力.
- 评估通过CB1 PAMs和ago-PAMs介导的脱敏和受体内化.
- 为了比较PAMs对CB1信号传输的效果与奥思特里克激动剂的影响.
主要方法:
- 使用HEK293细胞进行生物发光共振能量转移 (BRET) 试验.
- BRET测定测量了G蛋白解离,ERK1/2酸化和β-arrestin 2转位.
- 免疫细胞化学评估了CB1内部化作为对单独的PAMs (ZCZ011,GAT229,ABD1236) 和与正统激动剂 (AEA,2-AG,AMB-FUBINACA) 的反应.
主要成果:
- 所有测试的PAMs (ZCZ011,GAT229,ABD1236) 都充当了全激动剂,独立地激活CB.
- 当与2-AG相结合时,ago-PAM ZCZ011诱导了持续的ERK1/2酸化,这与ortostericagonists的短暂激活不同.
- PAMs强化了AEA诱导的信号传递,但对2-AG或AMB-FUBINACA的强化很小.
结论:
- 阿戈-PAMs可以通过AEA增强内分泌大麻素CB1的激进作用,而不是通过2-AG.
- 所有测试的化合物都充当了全性激动剂,激活CB1并招募β-arrestin2,从而导致内部化.
- 这些发现表明CB1 PAMs和ago-PAMs可能不会在体内保留内源性大麻素的时空信号.
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