拉普1通过RhoA信号和talin1组织淋巴细胞前后极性
Yoshihiro Ueda1, Koichiro Higasa2, Yuji Kamioka1
1The Department of Molecular Genetics, Institute of Biomedical Science, Kansai Medical University, Hirakata, Japan.
iScience
|July 31, 2023
概括
整合素激活剂Rap1对于淋巴细胞偏离和迁移至关重要,独立于细胞粘附. 拉普1向RhoA发送信号,而塔林1控制着行动蛋白细胞骨架的重组,以引导细胞运动.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 淋巴细胞贩运取决于化学介导的迁移,需要精确调节细胞极性和细胞骨动态.
- 控制淋巴细胞两极分化和定向迁移的特定分子机制仍然不完全理解.
研究的目的:
- 在淋巴细胞迁移期间量化评估细胞极性.
- 阐明整合素激活剂Rap1在调节淋巴细胞细胞骨动力学和极化中的作用,独立于基质粘附.
主要方法:
- 在淋巴细胞中定量测量细胞极性.
- 对缺乏Rap1的T细胞和淘汰Rap1-GTPase激活蛋白 (GAPs) 的分析Rasa3和Sipa1.
- 对F-actin支架,RhoA激活和actomyosin收缩性的研究.
主要成果:
- 拉普1缺陷损害了原始T细胞中actin细胞骨架的重组,使其变为伪足体和尿足体.
- 删除Rap1GAPs (Rasa3,Sipa1) 诱导了自发的细胞极化,突出显示了Rap1的极化作用.
- Rap1激活,依赖于F-actin支架,刺激了RhoA激活和后面的actomyosin收缩性.
- 在Rap1下游,Talin1促进了尿足动物的actomyosin收缩性,独立于基质粘附和整合素结合.
结论:
- 拉普1向RhoA和talin1发送信号,是化学激素刺激的淋巴细胞两极分化和化学反应的关键调节者.
- 这种Rap1介导的淋巴细胞迁移调节发生的独立于基质粘附.
- 这些发现揭示了一种控制淋巴细胞迁移动态的新机制.
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