货车成像FCS揭示了在抗原刺激的细胞中的膜稳定动力学
Gil-Suk Yang1,2,3, Nirmalya Bag1,4,3, Barbara A Baird1
1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853.
bioRxiv : the preprint server for biology
|December 25, 2025
概括
抗原刺激通过重组膜来触发巨细胞反应,而Lyn酶扩散速度比脂质探针减慢得更快. 这揭示了快速信号启动之前的全球膜变化.
科学领域:
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
- 免疫学 免疫学 免疫学
背景情况:
- 免疫球蛋白E受体 (IgE-FcεRI) 复合体的抗原 (Ag) 交叉连接启动了对过敏反应的巨细胞信号传递.
- 这一过程涉及液体排序 (Lo) 样膜区域 (船) 内的林氨酸激酶合.
- 之前的研究使用成像光相关谱学 (ImFCS) 来观察Ag添加后的膜重组.
研究的目的:
- 量化膜在静止和Ag刺激状态之间的转变的动力学.
- 为了研究在巨细胞激活过程中Lyn激酶和膜脂质的动态扩散变化.
- 为了将膜重组时间与早期信号事件相关联.
主要方法:
- 开发Boxcar ImFCS用于分分钟级的时间解析扩散测量.
- 测量Lyn-EGFP和PM-EGFP (低偏好) 扩散动态.
- 测量EGFP-GG (偏爱Ld) 传播动态,并与Syk招聘进行比较.
主要成果:
- Ag刺激导致Lyn-EGFP (t1/2 = 6.9分钟) 和PM-EGFP (t1/2 = 12分钟) 的逐渐扩散下降.
- 根据EGFP-GG的数据,扩散速度更快,时间1/2=9.4分钟.
- Syk招募比全球膜重组更快 (t1/2 = 5.0 分钟),这表明早期信号.
结论:
- 车ImFCS能够对刺激诱导的膜动态进行详细的动态分析.
- 与脂质探针相比,Lyn的蛋白质相互作用加速了其扩散过渡.
- 跨膜信号发送的启动先于完整的飞凝结和全球膜重组.
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