通过ROS PAMPs介导的细胞外HMGB1自我关联及其二元化增强了促炎信号传递
Man Sup Kwak1, Myeonggil Han2, Yong Joon Lee3
1Department of Microbiology, Yonsei University College of Medicine, Seoul, 03722, South Korea; Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul, 03722, South Korea.
Redox biology
|February 5, 2025
概括
细胞外高流动性组盒子1 (HMGB1) 蛋白通过Cys106形成二硫化物结合的二次体,显著增强促炎信号传递. 这种由PAMPs和H2O2触发的二分化,增加了与TLR2/4的结合和细胞因子的产生.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 蛋白质的寡合化,特别是二聚化,对于细胞功能和受体激活至关重要.
- 高流动性组盒子1 (HMGB1) 是一种氧化回归敏感的核蛋白,在分泌时充当损伤相关分子模式 (DAMP).
- 细胞外HMGB1的功能受其氧化还原状态的影响,但其同位分化和免疫学意义尚不清楚.
研究的目的:
- 为了研究Cys106-介导的HMGB1在细胞外环境中的同型二分化免疫学意义.
- 阐明HMGB1二元化影响促炎信号通路的机制.
主要方法:
- 在氧化物 (H2O2) 存在下,研究了由脂多糖 (LPS) 和酸 (LTA) 诱导的HMGB1自我结合和二硫化键形成.
- 利用Cys106残留突变,ROS清除剂N-乙半氨酸 (NAC) 和醇降解剂dithiothreitol (DTT) 来阻止HMGB1二分化.
- 评估了单体与二极体HMGB1对细胞内NF-κB信号传递,细胞因子产生和与托尔类受体 (TLRs) 的结合亲和力的影响.
主要成果:
- 细胞外HMGB1自我结合和Cys106-Cys106分子间二硫化物键的形成是由LPS,LTA和H2O2.2诱导的.
- HMGB1二分化被Cys106突变,NAC和DTT废除,这表明Cys106和氧化还原状态的关键作用.
- 炎症刺激导致单质HMGB1的分泌,而HMGB1的二元化是由PAMPs和H2O2.2促进的.
- 与单体HMGB1.1相比,Cys106-Cys106-连接的二极体HMGB1显著增强了细胞内NF-κB信号传递和细胞因子产生.
- 模态HMGB1对TLR2和TLR4表现出增加的直接结合亲和力,并促进了HMGB1介导的PAMP到它们的受体的有效传递.
结论:
- 通过Cys106调解的细胞外HMGB1同分化是增强促炎信号的关键机制.
- 狄米瑞克HMGB1通过增加TLR结合和促进PAMP递送,作为一种强大的免疫调节剂.
- 了解HMGB1二元化,可以了解炎症反应和潜在的治疗点.
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