MLKL-Driven Inflammasome Activation and Caspase-8 Mediate Inflammatory Cell Death in Influenza A Virus Infection.

MLKL-Driven Inflammasome Activation and Caspase-8 Mediate Inflammatory Cell Death in Influenza A Virus Infection.
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DOI:
10.1128/mbio.00110-23
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发表时间:
2023-04-25
期刊:
影响因子:
6.4
通讯作者:
Fitzgerald, Katherine A.
Fitzgerald, Katherine A.
中科院分区:
生物学1区
文献类型:
--
作者:
Lei, Xuqiu;Chen, Yongzhi;Lien, Egil;Fitzgerald, Katherine A.

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甲型流感病毒(IAV)触发多种程序性细胞死亡途径,包括髓细胞中mlkl依赖性坏死坏死、caspase-8依赖性凋亡和caspase-1依赖性焦亡。这三条通路都有共同的上游调节因子,即ZBP1和RIPK3。然而,iav诱导炎性小体活化的分子机制尚不清楚。在这里,我们证明了MLKL在iav感染的巨噬细胞中促进炎症小体激活和IL-1β加工。MLKL通过钾外排驱动NLRP3炎性体活化。在缺乏mlkl -炎性体轴的情况下,caspase-8协调IL-1β的成熟和分泌。在体内对IAV的宿主炎症反应中,MLKL单独是不可缺少的。综上所述,MLKL和caspase-8作为一种冗余机制,在IAV感染反应中驱动炎症形式的细胞死亡。
Influenza A virus (IAV) triggers multiple programmed cell death pathways, including MLKL-dependent necroptosis, caspase-8-dependent apoptosis, and caspase-1-dependent pyroptosis in myeloid cells. All three pathways share common upstream regulators, namely, ZBP1 and RIPK3. Yet, the molecular mechanism underlying IAV-induced inflammasome activation remains unclear. Here, we demonstrate that MLKL promotes inflammasome activation and IL-1β processing in IAV-infected macrophages. MLKL drives NLRP3 inflammasome activation through potassium efflux. In the absence of the MLKL-inflammasome axis, caspase-8 coordinates the maturation and secretion of IL-1β. MLKL alone is dispensable for host inflammatory responses to IAV in vivo. Taken together, MLKL and caspase-8 serve as redundant mechanisms by which to drive an inflammatory form of cell death in response to an IAV infection.
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