The inflammasome adaptor ASC regulates the function of adaptive immune cells by controlling Dock2-mediated Rac activation and actin polymerization.

The inflammasome adaptor ASC regulates the function of adaptive immune cells by controlling Dock2-mediated Rac activation and actin polymerization.
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DOI:
10.1038/ni.2095
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发表时间:
2011-09-04
期刊:
影响因子:
30.5
通讯作者:
--
中科院分区:
医学1区
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--
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连接蛋白ASC通过组装caspase-1激活的炎症体复合体来促进先天免疫。我们证明ASC在适应性免疫细胞中扮演着非炎症体细胞固有的角色。Asc−/−小鼠表现出树突状细胞的抗原提呈缺陷和淋巴细胞迁移,这是由于Rac介导的肌动蛋白聚合受损所致。全基因组分析表明,ASC而不是Nlrp3或caspase-1控制着DNA的稳定性和DOCK2的表达,DOCK2是一种鸟嘌呤核苷酸交换因子,在免疫细胞中介导RAC依赖的信号转导。DOCK2缺陷树突状细胞与AsC−/−细胞具有相似的抗原摄取缺陷。DOCK2在ASC缺陷细胞中的异位表达恢复了RAC介导的肌动蛋白聚合、抗原摄取和趋化作用。因此,ASC通过调节树突状细胞和淋巴细胞中依赖DOCK2的Rac活化和F-肌动蛋白聚合,形成独立于炎症体的适应性免疫。
The adaptor protein ASC contributes to innate immunity through the assembly of caspase-1-activating inflammasome complexes. We demonstrate that ASC plays an inflammasome-independent cell-intrinsic role in adaptive immune cells. Asc−/− mice displayed defective antigen presentation by dendritic cells and lymphocyte migration due to impaired Rac-mediated actin polymerization. Genome-wide analysis showed that ASC, but not Nlrp3 or caspase-1, controls mRNA stability and expression of DOCK2, a guanine nucleotide exchange factor that mediates Rac-dependent signaling in immune cells. DOCK2-deficient dendritic cells showed similar defective antigen uptake as Asc−/− cells. Ectopic expression of DOCK2 in ASC-deficient cells restored Rac-mediated actin polymerization, antigen uptake and chemotaxis. Thus, ASC shapes adaptive immunity independently of inflammasomes by modulating DOCK2-dependent Rac activation and F-actin polymerization in dendritic cells and lymphocytes.
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