补充的HLH易感性因素汇聚在CD8T细胞过活化上
Emily Landy1,2, Jemy Varghese3, Vinh Dang3
1Department of Immunology, University of Pittsburgh, Pittsburgh, PA.
Blood advances
|September 22, 2023
概括
在小鼠中对HLH和MAS的双重敏感性揭示了CD8 T细胞的关键作用. 珀福林缺乏和IL-18协同作用,通过T细胞过活化引起致命的炎症.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 病理学 病理学 病理学
背景情况:
- 血细胞淋巴细胞细胞瘤 (HLH) 和巨细胞激活综合征 (MAS) 是严重的超炎症状况.
- 家庭性HLH源于细胞毒性受损 (例如,穿孔素缺乏),而MAS则涉及过多的互白素-18 (IL-18).
- 对这些因素具有综合敏感性的小鼠会发生致命的自发性超炎症.
研究的目的:
- 在双重敏感小鼠中研究HLH和MAS背后的协同机制.
- 阐明CD8 T细胞在这些高炎症综合征的发病过程中的作用.
- 确定驱动T细胞过活化和疾病进展的关键分子通路.
主要方法:
- 使用转基因小鼠 (Prf1−/−Il18tg) 显示对HLH和MAS的双重敏感性.
- 病毒性 (淋巴细胞冠状腺炎病毒) 和先天性 (托尔类受体9) 触发剂.
- 进行了涉及T细胞受体 (TCR) 刺激和IL-18治疗的体外研究.
- 分析了T细胞种群,增殖,细胞因子生产和基因表达.
主要成果:
- 在CD8 T细胞中的IL-18信号传递促进了MAS,其次是病毒,但不是先天的触发因素.
- 在CD8 T细胞中,氨酸缺乏导致IL-18诱导的复兴诱导细胞死亡 (RICD).
- 双重敏感的小鼠表现出巨大的CD8T细胞过活化与增加的扩散和干扰素-玛的生产.
- T细胞显示了疲劳和效应器功能的标记,表明了独特的激活状态.
结论:
- IL-18和孔素缺乏之间的协同作用导致终端CD8T细胞过活化状态.
- 这种状态结合了疲劳和效应器功能的特征,导致致命的超炎症.
- 了解这些病理机制,可以了解HLH和MAS的致病性以及潜在的治疗点.
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