延长IKK激活的时间变化的刺激促进了核重塑和NF-κB动态的机械切换
Steven W Smeal1, Chaitanya S Mokashi1,2, A Hyun Kim1
1Department of Computational and Systems Biology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA.
bioRxiv : the preprint server for biology
|October 10, 2024
概括
细胞信号的动态,如蛋白质的变化,指导反应. 这项研究揭示了重复的细胞因子信号如何延长IκB激酶 (IKK) 组合,增强核因子 κB (NF-κB) 保留并影响细胞行为.
科学领域:
- 细胞信号和系统生物学
- 分子和细胞动态分子和细胞动态.
- 免疫学和炎症的研究
背景情况:
- 细胞对刺激的反应是由动态分子信号介导的.
- 了解如何传输和处理动态信号仍然是一个关键的知识差距.
- IκB激酶 (IKK) 到核因子 κB (NF-κB) 途径是许多细胞过程的核心.
研究的目的:
- 研究从细胞外细胞因子信号到NF-κB转录因子的信息传输.
- 阐明时间信号特性在细胞反应中的作用.
- 识别信号通路中出现性质背后的机制.
主要方法:
- 利用定制机器人控制的微流体系统进行精确的细胞培养和刺激.
- 采用双光报告器电池,同时测量输入输出信号的动态.
- 开发和完善机械模型,使用粒子群优化来分析实验数据.
主要成果:
- 与单个脉冲相比,节约剂量的细胞因子脉冲列车延长了IKK组件的寿命.
- 长时间的IKK组件导致核NF-κB的不成比例地增强保留.
- 一个结合NF-κB依赖性染色体重塑的机械模型重新总结了实验结果,解释了新出现的特性.
- 模拟准确地预测了单细胞NF-κB时间过程,将细胞对细胞的异质性归因于与受体相关的蛋白质复合体.
结论:
- 细胞因子信号的时间性质通过调节IKK-NF-κB通路动态来显著影响细胞反应.
- 依赖NF-κB的染色体重塑是解释时间剂量如何导致增强NF-κB保留的关键机制.
- 细胞对细胞反应的变异性主要来自受体关联蛋白质复合体水平的机制.
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