通过A20对NLRP3炎症酶的负调节可以防止关节炎
Lieselotte Vande Walle1,2, Nina Van Opdenbosch1,2, Peggy Jacques3
1Department of Medical Protein Research, VIB, Ghent, B-9000, Belgium.
Nature
|July 22, 2014
概括
在新的小鼠模型中,类风湿性关节炎的病理取决于Nlrp3炎症酶. 在骨髓细胞中删除A20基因会引发关节炎,突出显示A20是该疾病中炎症酶激活的调节者.
科学领域:
- 免疫学 免疫学 免疫学
- 类风湿病学 类风湿病学
- 分子生物学分子生物学
背景情况:
- 类风湿性关节炎 (RA) 是一种普遍的自身炎症性疾病,导致关节炎症.
- 干白素-1 (IL-1) 在类风湿性疾病中调解软骨破坏.
- 了解RA中的IL-1β产生受限于缺乏涉及炎症酶的合适小鼠模型.
研究的目的:
- 为了研究炎症酶在类风湿性关节炎的发病过程中的作用.
- 为了表征一种新的RA小鼠模型,该小鼠具有A20/Tnfaip3 (A20(myel-KO) 的骨髓体特异性缺失).
- 为了确定在RA中IL-1β生产的上游机制.
主要方法:
- 产生的骨髓细胞特异性A20/Tnfaip3淘汰赛小鼠 (A20(myel-KO)).
- 评估RA类多关节炎在A20小鼠中的发展.
- 研究了Nlrp3炎症酶和IL-1受体信号传递的贡献.
- 在A20缺陷巨细胞中分析了炎症酶激活 (Nlrp3,Nlrc4,AIM2).
- 评估了删除Nlrp3,caspase-1或IL-1受体在A20小鼠中的治疗效果.
主要成果:
- A20 ((myel-KO) 的小鼠自发地发展出类似人类RA的侵蚀性多关节炎.
- 这些小鼠的关节炎严重依赖于Nlrp3炎症酶和IL-1受体信号传递.
- 缺少A20增强了Nlrp3炎症酶激活,卡斯巴-1分裂,热和巨细胞中的IL-1β分泌.
- 删除Nlrp3,卡斯帕酶-1或IL-1受体显著保护A20 (粉-KO) 小鼠免受关节炎和软骨破坏.
- Nlrp3炎症酶激活,但不是Nlrc4或AIM2,在体内有助于RA病理.
结论:
- A20作为Nlrp3炎症酶激活的新型负调节剂.
- A20 (-KO) 小鼠代表了第一个实验模型,用于研究炎症酶对RA病变的参与.
- 准Nlrp3炎症酶通路可能为类风湿性关节炎提供治疗策略.
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