一个TLR4/TRAF6依赖的信号通路介导NCoR联合激活器复合体的形成,以激活炎症基因
Yohei Abe1, Eric R Kofman1,2,3, Zhengyu Ouyang1
1Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA 92093.
概括
收费类受体4 (TLR4) 信号将核受体核心压缩器 (NCoR) 转化为联合激活器. 这一途径涉及TRAF6,ERK1和TBK1,影响NFκB和AP-1基因激活.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 免疫学 免疫学 免疫学
背景情况:
- 核受体核心抑制剂 (NCoR) 通常与基因素脱乙酶3 (HDAC3) 起作用,抑制基因转录.
- 已被证明,NCoR/HDAC3复合体在特定的细胞环境中起到协活性剂的作用,例如棕色脂肪细胞和通过RANK信号的骨质细胞分化.
- 通过哪些精确的机制,NCoR/HDAC3复合体被招募并作为免疫受体信号响应的联合激活剂发挥作用,仍然不完全理解.
研究的目的:
- 研究托尔类受体 (TLR) 信号在NCoR/HDAC3复合体的组合和功能中的作用.
- 确定涉及TLR介导的NCoR/HDAC3复合物的特定信号分子和途径.
- 为了确定TLR4激活是否可以将NCoR从核心压缩器转换为特定转录因子的联合激活器.
主要方法:
- 刺激各种免疫受体,包括TLR4,TLR3,IL4受体和I型干扰素受体.
- 使用共免疫沉试验分析NCoR/HDAC3/PGC1β复合体的形成.
- 研究下游信号通路,包括TRAF6,ERK1,TBK1,NFκB和AP-1激活.
- 对基因乙化和转录激活在基因促进剂和增强剂的评估.
主要成果:
- 托尔类受体 (TLR) 4的激活,但不是TLR3,IL4受体或I型干扰素受体,诱导了NCoR/HDAC3/PGC1β联合激活复合物的组装.
- 核因子kappa-B (RANK) 和TLR4的受体激活剂利用TNF受体关联因子6 (TRAF6) 和下游信号,涉及细胞外信号调节激酶1 (ERK1) 和TANK结合激酶1 (TBK1) 进行巨细胞中NCoR/HDAC3/PGC1β复合组合.
- 在TLR4信号传递中诱导的复合物包括ERK1,NFκB的p65组成部分和p300基因组酸转移酶 (HAT),导致局部基因组酸转化和TLR4依赖基因的转录激活.
结论:
- 收费类受体4 (TLR4) 信号触发了一条途径,将核受体核心压缩器 (NCoR) 转化为一个协同激活器复合体.
- 这种转化涉及TLR4,TRAF6,ERK1和TBK1,导致NFκB和AP-1转录因子的同激活.
- 这些发现揭示了NCoR功能在免疫反应和潜在的其他生物过程中的新型信号机制.
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