选择性抑制大麻素CB1受体引起的信号传递,由相互作用蛋白质GAP43进行
Irene B Maroto1, Estefanía Moreno2, Carlos Costas-Insua1
1Department of Biochemistry and Molecular Biology, Instituto Universitario de Investigación Neuroquímica (IUIN), Complutense University, 28040, Madrid, Spain; Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas (CIBERNED), Instituto de Salud Carlos III, 28029, Madrid, Spain; Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), 28034, Madrid, Spain.
Neuropharmacology
|September 9, 2023
概括
增长相关蛋白43 (GAP43) 通过Gq/11合选择性抑制大麻素受体1 (CB1R) 信号传递,影响神经元外生长. 这种相互作用阻断了CB1R介导的ROCK激活,揭示了一个新的信号通路.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
背景情况:
- 大麻素通过大麻素受体1 (CB1R) 调节大脑功能.
- 在模型中,CB1R与生长相关蛋白43 (GAP43) 相互作用,抑制其功能.
- CB1R-GAP43相互作用的分子机制尚未完全理解.
研究的目的:
- 阐明GAP43调节CB1R信号的分子机制.
- 研究GAP43对不同CB1R介导通路的影响的选择性.
- 描述CB1R-GAP43相互作用的结构基础.
主要方法:
- 对于CB1R和GAP43.3的HEK293T细胞共同表达系统.
- 对G蛋白合 (Gi/o,Gq/11),cAMP/PKA,ERK信号传递和受体内化进行检测.
- 通过NMR光谱学来描述CB1R-GAP43相互作用的特征.
- 在小鼠海马神经元中的实验.
主要成果:
- GAP43选择性抑制激素诱发的CB1R介导的Gq/11信号传递和ROCK激活,但不是Gi/o信号传递 (cAMP/PKA,ERK) 或受体内化.
- 在GAP43中,受损的CB1R-Gq/11蛋白质合.
- 在海马神经元中,GAP43阻断了大麻素诱导的神经元崩.
- 核磁共振证实了GAP43与CB1RC终端域的直接,特定的结合.
结论:
- GAP43选择性地准一个CB1R-Gq/11-ROCK信号轴.
- 这种相互作用会负面调节神经细胞外生长.
- 这些发现揭示了由GAP43控制的新型信号通路,该通路影响神经元形态.
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