由RIPK1的不可切割变体引起的主导性自身炎症性疾病
Panfeng Tao1, Jinqiao Sun2, Zheming Wu3
1The MOE Key Laboratory of Biosystems Homeostasis & Protection, Life Sciences Institute, Zhejiang University, Hangzhou, China.
在RIPK1 (受体交互蛋白激酶1) 中的基因变异会损害caspase-8裂变,导致自身炎症. 这导致RIPK1激活的增加,对细胞死亡的过敏,以及炎症反应的增加.
科学领域:
- 细胞生物学
- 免疫学
- 遗传学
背景情况:
- 受体相互作用蛋白激酶1 (RIPK1) 的激活调节TNF介导的亡,亡和炎症.
- RIPK1的卡斯帕斯-8分裂将其酶域与其他功能域分离.
- 人类自身炎症性疾病中RIPK1分裂受损的作用以前是未知的.
研究的目的:
- 研究人体中卡斯巴酶-8介导的RIPK1裂变受损的功能后果.
- 确定与自身炎症相关的 RIPK1 的遗传变异.
- 阐明RIPK1驱动的炎症和细胞死亡的分子机制.
主要方法:
- 对经常发烧和淋巴腺病的家庭进行基因分析.
- 使用患者衍生的外周血液单核细胞和纤维细胞进行功能测试.
- 在小鼠胚胎纤维细胞中进行RIPK1突变表达的体外研究.
- 分析RIPK1激活,细胞亡,细胞亡和炎症性细胞因子的产生.
主要成果:
- 鉴定RIPK1变体 (D324V,D324H) 导致自体主导的自身炎症性疾病由于卡斯巴酶-8裂变受损.
- 患者细胞表现出增加的RIPK1激活,对TNF诱导的亡和亡过敏,以及炎症性细胞因子/ 化学因子的增加.
- 在小鼠细胞中发现的RIPK1突变对亡/死亡的敏感性增加,并诱导了促炎细胞因子.
- 患者的纤维细胞表现出减少的RIPK1表达和ROS产生,从而产生对死细胞和铁细胞的抵抗力.
结论:
- 人类非可切割的RIPK1变体促进RIPK1的激活,导致自身炎症性疾病.
- 这种疾病的特征是对亡和亡的过敏以及炎症反应的加剧.
- 患者纤维细胞中的补偿机制可以防止某些促死亡的刺激.
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