Neutrophil extracellular traps promote macrophage pyroptosis in sepsis.

Neutrophil extracellular traps promote macrophage pyroptosis in sepsis.
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中性粒细胞胞外陷阱促进脓毒症中巨噬细胞焦亡

DOI:
10.1038/s41419-018-0538-5
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发表时间:
2018-05-22
影响因子:
9
通讯作者:
Fan J
Fan J
中科院分区:
生物学1区
文献类型:
--
作者:
Chen L;Zhao Y;Lai D;Zhang P;Yang Y;Li Y;Fei K;Jiang G;Fan J

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为了应对感染,多形核中性粒细胞(PMN)被招募到感染部位,并采用三种主要策略来对抗微生物,包括吞噬作用、脱颗粒和中性粒细胞胞外陷阱(NET)。 NET 是由染色质纤维与颗粒源性抗菌肽和酶混合而成的网状结构,可捕获并杀死细胞外的细菌。在这项研究中,通过使用小鼠脓毒症模型,我们确定了 NET 诱导巨噬细胞 (Mφ) 焦亡(一种依赖 caspase-1 的调节性细胞死亡)的新机制。我们发现,NET 衍生的 HMGB1 通过 RAGE 和动力依赖性信号传导起作用,触发 Mφ 内分子事件级联,包括组织蛋白酶 B (CatB) 从破裂的溶酶体中释放,随后形成焦亡体和 caspase-1 激活,以及随后的 Mφ 焦亡。 The study further demonstrates that Mϕ pyroptosis augments inflammatory responses following sepsis.这些发现揭示了 NET 在介导 PMN-Mphi 相互作用中的促炎作用,从而影响感染后炎症的进展。
In response to infection, polymorphonuclear neutrophils (PMN) are recruited in the infectious sites, and employ three major strategies to fight against the microbes including phagocytosis, degranulation, and neutrophil extracellular traps (NETs). NETs are a meshwork of chromatin fibers mixed with granule-derived antimicrobial peptides and enzymes, which trap and kill the bacteria extracellularly. In this study, by using a mouse sepsis model, we identified a novel mechanism by which NETs induce macrophage (Mϕ) pyroptosis, a caspase-1-dependent regulated cell death. We show that NET-derived HMGB1, acting through RAGE and dynamin-dependent signaling, triggers an intra-Mϕ cascade of molecular events including cathepsin B (CatB) release from the ruptured lysosomes, followed by pyroptosome formation and caspase-1 activation, and subsequent Mϕ pyroptosis. The study further demonstrates that Mϕ pyroptosis augments inflammatory responses following sepsis. These findings shed light on the proinflammatory role of NETs in mediating PMN–Mϕ interaction, which therefore influences the progress of inflammation following infection.
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