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Updated: May 30, 2025

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具有独家ICAM-1结合性质的大型可溶性CD18复合物在免疫细胞迁移期间在炎症中脱落
Alexey Ferapontov1, Anders Mellemkjær1, Helen M McGettrick2
1Department of Biomedicine, Aarhus University, Denmark.
Journal of translational autoimmunity
|January 27, 2025
概括
可溶性CD18 (sCD18) 复合体通过影响细胞因子的释放来调节炎症. 大量的sCD18复合体与ICAM-1结合,并由中性粒细胞分泌,这解释了它们在类风湿性关节炎 (RA) 炎症中的流行.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- CD11/CD18整合素对于白细胞粘附和迁移在生理和病理炎症反应中至关重要.
- 可溶性CD18 (sCD18) 存在于不同的复杂大小,可能表明功能变异.
- 以前的研究表明sCD18复合体可以结合细胞间粘附分子 (ICAM) -1,但与大小相关的功能差异仍然不清楚.
研究的目的:
- 调查sCD18复合体大小在调节炎症中的功能意义.
- 确定sCD18复合体在细胞因子释放和ICAM-1结合中的作用.
- 为了将sCD18复杂特征与类风湿性关节炎 (RA) 中的炎症过程相关联.
主要方法:
- 对sCD18复合体大小及其与ICAM-1结合的关联进行分析.
- 对sCD18对单细胞化学吸引蛋白-1 (MCP-1/CCL2) 从纤维细胞样突细胞释放的影响的评估.
- 迁移中性粒细胞产生的sCD18复合体的表征.
- 在RA患者中比较sCD18复合体概况.
主要成果:
- 血清sCD18调节了促炎性细胞因子MCP-1/CCL2.2的释放.
- 只有大型sCD18复合体表现出ICAM-1结合能力.
- 迁移中的中性粒细胞主要分泌大型sCD18复合体.
- 大型sCD18复合体在RA炎症部位中普遍存在,与中性粒细胞的流入相关.
结论:
- sCD18复合体的大小是其调节炎症功能的关键决定因素.
- 大型sCD18复合体通过结合ICAM-1和调解细胞因子的释放,在炎症过程中发挥重要作用.
- 这些发现阐明了一种由sCD18调节炎症的新机制,并表明对关节炎等炎症性疾病的潜在治疗点.
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