Gasdermin D Restrains Type I Interferon Response to Cytosolic DNA by Disrupting Ionic Homeostasis.

Gasdermin D Restrains Type I Interferon Response to Cytosolic DNA by Disrupting Ionic Homeostasis.
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DOI:
10.1016/j.immuni.2018.07.006
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发表时间:
2018-09-18
期刊:
影响因子:
32.4
通讯作者:
Rathinam VAK
Rathinam VAK
中科院分区:
医学1区
文献类型:
--
作者:
Banerjee I;Behl B;Mendonca M;Shrivastava G;Russo AJ;Menoret A;Ghosh A;Vella AT;Vanaja SK;Sarkar SN;Fitzgerald KA;Rathinam VAK

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炎性小体激活的caspase-1裂解气真皮蛋白D以揭示其孔隙形成活性,其主要后果是焦亡。在这里,我们报道了气真皮蛋白D在限制胞质DNA监测中的额外生物学作用。细胞质DNA被Aim2和环GMP-AMP合成酶(cGAS)感应,分别导致炎症小体和I型干扰素反应。我们发现,Aim2炎性小体激活的气皮蛋白D可抑制巨噬细胞中cgas驱动的I型干扰素对胞质DNA和新弗朗西斯菌的反应。同样,在气皮蛋白d缺乏的小鼠中,干扰素-β (IFN-β)对新乳杆菌感染的反应升高。Gasdermin d介导的IFN-β的负调控发生在焦亡-,白细胞介素-1 (IL-1)-和il -18独立的方式。在机制上,气真皮蛋白D通过膜孔耗尽细胞内钾(K+),而这种K+外排是抑制cgas依赖性IFN-β反应所必需和充分的。因此,我们的研究发现了一个额外的干扰素调节模块,涉及气真皮蛋白D和K+外排。气皮蛋白D是一种孔隙形成蛋白,在炎症体复合物的激活下介导细胞死亡和IL-1的释放。Banerjee等人证明了气凝胶蛋白d驱动的K+外排在控制cgas依赖的I型干扰素对细胞质DNA的反应中具有先前未知的调节作用。
Inflammasome-activated caspase-1 cleaves gasdermin D to unmask its pore forming activity, the predominant consequence of which is pyroptosis. Here, we report an additional biological role for gasdermin D in limiting cytosolic DNA surveillance. Cytosolic DNA is sensed by Aim2 and cyclic GMP-AMP synthase (cGAS) leading to inflammasome and type I interferon responses, respectively. We found that gasdermin D activated by the Aim2 inflammasome suppressed cGAS-driven type I interferon response to cytosolic DNA and Francisella novicida in macrophages. Similarly, interferon-β (IFN-β) response to F. novicida infection was elevated in gasdermin D-deficient mice. Gasdermin D-mediated negative regulation of IFN-β occurred in a pyroptosis-, interleukin-1 (IL-1)-, and IL-18-independent manner. Mechanistically, gasdermin D depleted intracellular potassium (K+) via membrane pores, and this K+ efflux was necessary and sufficient to inhibit cGAS-dependent IFN-β response. Thus, our findings have uncovered an additional interferon regulatory module involving gasdermin D and K+ efflux. Gasdermin D is a pore forming protein, which upon activation by inflammasome complexes mediates pyroptotic cell death and IL-1 release. Banerjee et al., demonstrate a previously unknown regulatory role for gasdermin D-driven K+ efflux in reining in cGAS-dependent type I interferon response to cytosolic DNA.
形成孔的蛋白质加油D可以调节白细胞介素-1的巨噬细胞分泌。
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