细胞培养软基质下的纯能P2Y6受体自发激活
Akiyuki Nishimura1,2,3, Kazuhiro Nishiyama4,5, Tomoya Ito4
1Division of Cardiocirculatory Signaling, National Institute for Physiological Sciences (NIPS), National Institutes of Natural Sciences, Okazaki 444-8787, Japan.
Cells
|February 12, 2025
概括
基质的刚度,而不是表面涂层,影响G蛋白合受体 (GPCR) 基底活性. 纯能P2Y6受体在软上表现出独立于连接体的振荡,而不是刚性玻璃,这揭示了GPCR调节的新机制.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生化学
- 身体生理学 身体生理学
背景情况:
- G蛋白结合受体 (GPCRs) 表现出基底活性,受其非活性/活性构造状态的影响.
- 物理压力的影响,如基质刚性,GPCR基底活性仍然在很大程度上未被探索.
研究的目的:
- 为了研究细胞粘附表面的刚度是否会影响GPCRs的基底活性.
- 确定特定的GPCR和参与基质刚性调节活性的机制.
主要方法:
- 在不同硬度的基板上培养细胞 (与玻璃).
- 测量细胞内 (Ca2+) 振荡作为GPCR活性指标.
- 基因操纵 (RGD动机的突变) 和细胞外离子依赖的评估.
主要成果:
- 纯能P2Y6受体 (P2Y6R) 在软上表现出自发的Ca2+振荡,但不是刚性玻璃,独立于核酸.
- 表面涂层 (原,拉米宁,纤维蛋白) 并没有改变P2Y6R活性.
- 细胞外RGD动机的突变和细胞外Ca2+的缺失取消了自发的P2Y6R活性.
- GPCR查显示,其他纯能受体 (P2Y1R,P2Y2R) 也在软基质上表现出自发活性.
结论:
- 细胞粘附表面的硬度调节了几个GPCRs的自发活性,包括P2Y6R.
- 这种调制通过一种连接体独立的机制发生,可能涉及细胞外Ca2+和受体的RGD动机.
- 这些发现表明基质机制代表了GPCR信号传递的新型调节因素.
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