直接的GPCR-EGFR相互作用使膜与核之间的协同信息传输成为可能
Michael Gekle1, Robert Eckenstaler2, Heike Braun2
1Julius-Bernstein-Institute of Physiology, Martin Luther University Halle-Wittenberg, 06112, Halle (Saale), Germany. michael.gekle@medizin-halle.de.
Cellular and molecular life sciences : CMLS
|June 20, 2024
概括
表皮生长因子受体 (EGFR) 与G蛋白合受体 (GPCR) 的异构化对于协同核信号传输至关重要. 这项研究表明,AT1R-EGFR相互作用能够实现协同的基因表达调节,超出了简单的依赖连接体的激活.
科学领域:
- 细胞生物学 细胞生物学
- 分子药理学分子药理学
- 信号传输 信号传输
背景情况:
- 皮表皮生长因子受体 (EGFR) 和G蛋白合受体 (GPCRs) 是细胞表面的关键受体.
- EGFR和GPCR之间的异构化影响细胞信号通路.
- 作为一个模型系统,研究了AT1R和EGFR之间的相互作用.
研究的目的:
- 为了研究AT1R和EGFR的异构化.
- 确定AT1R-EGFR异构化在协同核信息传输中的功能相关性.
- 阐明这种相互作用在下游基因表达调节中的作用.
主要方法:
- 在模拟中设计AT1R突变体缺乏EGFR相互作用.
- 同免疫沉 (CoIP),弗斯特尔共振能量转移 (FRET) 和光终身成像显微镜 (FLIM) 来评估受体相互作用.
- 数字高含量显微镜测量细胞形态的变化,ERK1/2酸化 (ppERK1/2),血清反应因子 (SRF) 激活和cFOS蛋白表达.
主要成果:
- CoIP,FRET和FLIM证实了野生型AT1R和EGFR之间的物理相互作用,在AT1R突变中显著减少.
- 表达野生型AT1R和EGFR的细胞对细胞形态,ppERK1/2,cFOS和SRF活动的刺激产生了协同反应.
- 这种EGFR-AT1R协同作用在表达互动缺陷AT1R突变的细胞中完全不存在.
结论:
- AT1R-EGFR异构化对于调解协同下游基因表达调节至关重要.
- 这种异构化调节了核信息传输的强度和时间动态.
- 仅靠依赖于体的EGFR转活是不足以完全控制基因表达的协同作用.
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