在骨髓细胞中的C9orf72抑制了STING诱导的炎症
Madelyn E McCauley1,2, Jacqueline Gire O'Rourke1,2, Alberto Yáñez3,4
1Center for Neural Science and Medicine, Cedars-Sinai Medical Center, Los Angeles, CA, USA.
Nature
|August 21, 2020
概括
通过过度激活STING- 干扰素通路,骨髓细胞中的C9orf72会导致ALS/ FTD的炎症. 在C9-ALS/FTD患者中抑制这种途径可能会减少疾病症状.
科学领域:
- 神经免疫学
- 神经退化的遗传学
- 天生的免疫力
背景情况:
- 肌缩侧面硬化 (ALS) 和前性痴呆 (FTD) 具有共同的遗传起源,C9orf72重复扩张是家族形式 (C9-ALS/FTD) 的最常见原因.
- 在ALS和FTD患者中经常观察到自身免疫性疾病,但潜在的机制尚不清楚.
- 在C9-ALS/FTD中降低的C9orf72蛋白水平与RNA和二积累有关.
研究的目的:
- 研究C9orf72在骨髓细胞中对C9-ALS/FTD免疫失调的作用.
- 探索STING-干扰素途径在C9-ALS/FTD的发病过程中的参与.
- 确定C9-ALS/FTD的潜在治疗点.
主要方法:
- 使用C9orf72绝杀小鼠模型 (C9orf72-/-) 和部分缺乏C9orf72的小鼠.
- 分析了免疫细胞激活,特别是树突细胞和骨髓细胞,重点是I型干扰素反应.
- 研究了STING (干扰素基因刺激器) 途径,包括STING降解及其在炎症中的作用.
- 从C9-ALS/FTD和零星ALS/FTD患者获得的检查样本 (巨细胞,血液,脑组织).
- 在临床前模型和来自患者的细胞中测试STING抑制剂的疗效.
主要成果:
- 在完全昏倒的小鼠中观察到的 C9orf72 单独在骨髓细胞中的复合炎症表型.
- C9orf72- / - 髓状细胞表现出较高的I型干扰素反应,特别是对STING激活剂的过度反应.
- 在C9orf72-/ - 骨髓细胞中发现了自解体降解的障碍.
- 阻断STING可降低C9orf72-/-小鼠的炎症和大,并抑制C9-ALS/FTD患者样本中的I型干扰素特征升高.
- 患有C9orf72缺乏症的小鼠对实验性自身免疫脑炎的敏感性增加.
结论:
- 在C9-ALS/FTD患者中降低的C9orf72水平导致了由STING介导的I型干扰素诱导和炎症特征的免疫表型变化.
- 在C9-ALS/FTD中,STING-干扰素途径是神经炎症的关键驱动因素.
- 用抑制剂向STING途径是C9-ALS/FTD的一个有希望的治疗策略.
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