在斑马鱼中,IRAK3和IRAK1都激活了MyD88-TRAF6通路
Panwei Weng1,2, Mengjiao Lan1, Hao Zhang1
1State Key Laboratory of Biocontrol, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Guangdong Key Laboratory of Pharmaceutical Functional Genes, School of Life Sciences, Sun Yat-sen University, Guangdong, China.
Journal of immunology (Baltimore, Md. : 1950)
|June 7, 2024
概括
斑马鱼IRAK1和IRAK4可以增强TLR/IL-1R信号通路. 确定了两种IRAK3变体:IRAK3a增强了轻微的信号传输,而IRAK3b抑制了它,为鱼类IRAK演变提供了新的见解.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 进化生物学 进化生物学
背景情况:
- 介乐金-1受体相关激酶 (IRAKs) 是托尔类受体 (TLR) 和介乐金-1受体 (IL-1R) 途径中的关键信号传感器.
- 脊椎动物有两个IRAK系 (IRAK1/2/3和IRAK4),IRAK3在哺乳动物中起到抑制作用.
- 鱼类IRAK1,IRAK3和IRAK4的功能差异仍然不清楚,因为骨鱼中没有IRAK2.
研究的目的:
- 研究斑马鱼IRAK1,IRAK3变体 (IRAK3a和IRAK3b) 和IRAK4在TLR/IL-1R信号传输中的功能作用.
- 阐明脊椎动物IRAK功能模式的进化机制,特别是在骨鱼中.
- 描述鱼类IRAKs的分子相互作用和信号活动.
主要方法:
- 同免疫沉测试以确定蛋白质复合体的形成,包括Myddosome复合体 (MyD88-IRAK4-IRAK1).
- 分析斑马鱼IRAK3变体 (IRAK3a和IRAK3b) 的结构差异,包括酶和TRAF6结合域的存在或缺失.
- 在人类293T细胞和斑马鱼胚胎中进行功能测试,以评估不同IRAK组件的信号通路激活和抑制.
主要成果:
- 斑马鱼IRAK1和IRAK4形成了Myddosome复合体,IRAK1作为一种强大的通路增强剂.
- 确定了两种斑马鱼IRAK3变体:IRAK3a具有功能域和IRAK3b缺乏激酶和TRAF6结合域.
- IRAK3a适度增强信号传输,IRAK3b充当抑制剂,两种IRAK3变体都抑制IRAK1/4活动,可能是通过对MyD88和TRAF6.6的竞争来抑制IRAK1/4活动.
结论:
- 斑马鱼IRAK1和IRAK4在Myddosome复合体内充当路径增强剂.
- 斑马鱼中确定的IRAK3变体表现出不同的作用,IRAK3a作为温和增强剂,IRAK3b作为抑制剂,显示功能分歧.
- 这些发现为鱼类IRAKs的分子功能以及脊椎动物IRAK信号通路的进化适应提供了新的见解.
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