流感病毒Z-RNA诱导ZBP1介导的死亡
Ting Zhang1, Chaoran Yin1, David F Boyd2
1Blood Cell Development and Function Program, Fox Chase Cancer Center, Philadelphia, PA, USA.
Cell
|March 24, 2020
概括
流感A病毒的复制会产生Z-RNAs,在细胞核中激活ZBP1,从而启动亡. 这种途径增加了中性粒细胞的激活和疾病的严重程度,突出了流感治疗的新目标.
科学领域:
- 病毒学
- 免疫学
- 细胞生物学
背景情况:
- A型流感病毒 (IAV) 感染会触发细胞死亡路径,包括细胞亡和亡.
- Z-尿酸结合蛋白1 (ZBP1) 感知病毒RNA并激活RIPK3介导的细胞死亡.
- 混合基因酶域类伪基因酶 (MLKL) 是死亡的关键效应因子.
研究的目的:
- 调查ZBP1和MLKL在IAV诱导的细胞死亡中的作用.
- 在IAV感染期间识别激活ZBP1的特定病毒成分.
- 阐明核MLKL激活在IAV病变的后果.
主要方法:
- 使用细胞培养和小鼠IAV感染模型.
- 使用分子生物学技术检测Z-RNA并评估ZBP1激活.
- 分析了细胞死亡途径,核膜完整性和中性粒细胞的招募.
主要成果:
- 复制IAV会产生Z-RNA,在核中激活ZBP1.
- 核ZBP1激活导致RIPK3介导的MLKL激活,核膜破坏和亡.
- 缺乏MLKL的小鼠表现出肺部病态的减少,中性粒细胞透的减少,以及致命的IAV挑战后的生存率的提高.
- 核MLKL激活强烈促进中性粒细胞激活,这是流感相关炎症的关键驱动因素.
结论:
- Z-RNA被确定为一种激活ZBP1的新型病原体相关分子模式 (PAMP).
- 描述了源自细胞核的ZBP1启动的"内外"细胞死亡途径.
- 这种途径有助于严重流感的炎症病理,表明治疗潜力.
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