通过多个Gαi/o异形,CB1受体与细胞外调节激酶的合
Boyd R Rorabaugh1,2, Daniel J Morgan1,2
1Department of Pharmaceutical Sciences, Marshall University School of Pharmacy.
大麻素1型受体 (CB1Rs) 通过多个Gαi/o蛋白激活细胞外信号调节激酶 (ERK). 这项研究确定了Gαo,Gαi1,Gαi2和Gαi3作为合伙伴,Gαi3可能对部分激素激剂诱导的ERK激活至关重要.
科学领域:
- 分子药理学分子药理学
- 细胞信号传递 细胞信号传递
- 神经科学是一个神经科学.
背景情况:
- 大麻素1型受体 (CB1Rs) 对许多生理过程至关重要,包括神经传递和细胞存活.
- CB1R信号传递涉及咳毒素 (PTX) 敏感的Gαi/o蛋白,导致细胞外信号调节激酶 (ERK) 路径激活.
- 调解CB1R诱导ERK酸化的特定Gαi/o异型仍然在很大程度上没有特征.
研究的目的:
- 为了阐明哪些特定的Gαi/o异型是负责将CB1受体与ERK酸化合的.
- 调查Gαi/o异型在调解对CB1R激动剂的反应中的差异性作用,有效性不同.
主要方法:
- 使用表达CB1Rs的HEK293细胞.
- 细胞被转移为Gαo,Gαi1,Gαi2或Gαi3.3的PTX不敏感突变.
- 在PTX诱导内源Gαi/o蛋白失活后,用载体,CP55940 (完全激动剂) 或delta-9-tetrahydrocannabinol (∆9-THC;部分激动剂) 治疗后,通过Western blotting评估ERK酸化.
主要成果:
- CP55940诱导的ERK酸化被PTX取消,但通过表达PTX不敏感的Gαo,Gαi1,Gαi2或Gαi3得到挽救,表明CB1R与所有测试的异形结合.
- ∆9-THC诱导了适度的ERK酸化,这仅在表达PTX不敏感Gαi3.3的细胞中具有统计学意义.
- 这些发现表明,CB1R可以通过多个Gαi/o异型激活ERK,Gαi3可能在部分激动体信号传递中发挥关键作用.
结论:
- 大麻素1型受体通过Gαo,Gαi1,Gαi2和Gαi3对ERK酸化进行配对,当被完全激动剂 (CP55940) 刺激时.
- 部分激素 (∆9-THC) 介导的ERK激活可能需要Gαi3蛋白的大量表达.
- 这项研究澄清了CB1R激活下游的特定G蛋白介导信号通路.
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