Department of Immunology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA.
Department of Immunology, St. Jude Children's Research Hospital, Memphis, Tennessee, USA.
J Biol Chem. 2020 Dec 25;295(52):18276-18283. doi: 10.1074/jbc.RA120.015924. Epub 2020 Oct 27.
are dangerous fungal pathogens with high morbidity and mortality, particularly in immunocompromised patients. Innate immune-mediated programmed cell death (pyroptosis, apoptosis, necroptosis) is an integral part of host defense against pathogens. Inflammasomes, which are canonically formed upstream of pyroptosis, have been characterized as key mediators of fungal sensing and drivers of proinflammatory responses. However, the specific cell death pathways and key upstream sensors activated in the context of and infections are unknown. Here, we report that and infection induced inflammatory programmed cell death in the form of pyroptosis, apoptosis, and necroptosis (PANoptosis). Further, we identified the innate immune sensor Z-DNA binding protein 1 (ZBP1) as the apical sensor of fungal infection responsible for activating the inflammasome/pyroptosis, apoptosis, and necroptosis. The Zα2 domain of ZBP1 was required to promote this inflammasome activation and PANoptosis. Overall, our results demonstrate that and induce PANoptosis and that ZBP1 plays a vital role in inflammasome activation and PANoptosis in response to fungal pathogens.
是具有高发病率和死亡率的危险真菌病原体,特别是在免疫功能低下的患者中。先天免疫介导的程序性细胞死亡(细胞焦亡、细胞凋亡、细胞坏死)是宿主防御病原体的一个组成部分。炎症小体是细胞焦亡的上游经典形成物,已被确定为真菌传感的关键介质和促炎反应的驱动因素。然而,在 和 感染的情况下,激活的特定细胞死亡途径和关键上游传感器尚不清楚。在这里,我们报告 和 感染以细胞焦亡、细胞凋亡和细胞坏死(PANoptosis)的形式诱导炎症性程序性细胞死亡。此外,我们确定先天免疫传感器 Z 型 DNA 结合蛋白 1(ZBP1)是真菌感染的顶端传感器,负责激活炎症小体/细胞焦亡、细胞凋亡和细胞坏死。ZBP1 的 Zα2 结构域对于促进这种炎症小体激活和 PANoptosis 是必需的。总的来说,我们的结果表明 和 诱导 PANoptosis,并且 ZBP1 在炎症小体激活和对真菌病原体的 PANoptosis 中起着至关重要的作用。