葡萄糖皮质体和IL4驱动的巨细胞编程之间的表观基因组和功能融合机制
Dinesh K Deochand1,2, Marija Dacic1,3, Michael J Bale4,5
1Hospital for Special Surgery Research Institute, David Z. Rosensweig Genomics Center, New York, NY, USA.
Nature communications
|October 18, 2024
概括
不同的信号汇聚在巨细胞编程上. 干白素-4和葡萄皮质激素诱导类似的组织修复状态,通过调节基因表达通过KLF4和葡萄皮质激素受体,集成GRIP1.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 基因组学就是基因组学.
背景情况:
- 巨细胞根据环境信号表现出不同的表型.
- 2型细胞因子介素-4 (IL4) 诱导了一种组织修复的M2表型 (M2).
- 葡萄糖皮质类药物 (GC) 是一种抗炎药物,也会诱导类似的M2表型 (M2GC).
研究的目的:
- 研究在巨细胞编程中IL4和GC通路的功能融合背后的分子机制.
- 为了阐明不同的信号如何激活共享的恒常性巨细胞状态.
主要方法:
- 整合功能基因组学用于比较M2IL4和M2GC的转录组和染色质景观.
- 对转录效应因子KLF4和葡萄糖皮质体受体的全基因组占用率分析.
- 评估GRIP1在整合转录反应中的作用.
- 在体外细胞活性测定.
- 使用小鼠结肠炎模型进行体内研究,以评估巨细胞组织修复特性.
主要成果:
- M2IL4和M2GC的转录组显示出明显的重叠,共享的染色体格局变化.
- 一个核心的平静计划是由KLF4和葡萄糖皮质体受体驱动的.
- 核受体辅因子GRIP1以特定刺激的方式集成KLF4和葡萄皮质类受体的作用.
- 在M2IL4和M2GC表型之间的许多共享的转录基因变化中观察到GRIP1依赖性.
- 在实验室中,GRIP1缺乏会损害巨细胞化和体内组织修复功能.
结论:
- 不同的信号通路 (IL4和GC) 汇聚在一个共同的恒常性巨细胞程序上.
- GRIP1充当这些独特信号的关键集成者,调解共享的转录结果.
- 了解这种融合为巨细胞编程提供了一个机制框架,并为抗炎药物设计提供了信息.
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