HDAC6 mediates an aggresome-like mechanism for NLRP3 and pyrin inflammasome activation.

HDAC6 mediates an aggresome-like mechanism for NLRP3 and pyrin inflammasome activation.
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DOI:
10.1126/science.aas8995
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发表时间:
2020-09-18
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Wu H
Wu H
中科院分区:
其他
文献类型:
--
作者:
Magupalli VG;Negro R;Tian Y;Hauenstein AV;Di Caprio G;Skillern W;Deng Q;Orning P;Alam HB;Maliga Z;Sharif H;Hu JJ;Evavold CL;Kagan JC;Schmidt FI;Fitzgerald KA;Kirchhausen T;Li Y;Wu H

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炎症体是一种超分子复合体,在免疫监测中发挥着关键作用。这是通过激活炎性半胱氨酸酶来实现的,炎性半胱氨酸酶导致IL-1β的蛋白分解成熟和下垂。在这里,我们发现NLRP3和吡喃介导的炎症小体组装、caspase激活和IL-1β转换发生在微管组织中心。此外,动力蛋白接头HDAC6对于这些炎症体的微管运输和组装是必不可少的,在永生化和原代巨噬细胞和小鼠中表现为化学抑制和靶向缺失。由于HDAC6可以将泛素化的病理性聚集体运送到MTOC进行侵袭体的形成和自噬小体的降解,因此它在NLRP3和吡咯炎性小体激活中的作用也提供了一种内在的机制,通过自噬下调这些炎性小体。这项工作表明,生理聚集体的形成和病理聚集体的形成之间存在着意想不到的相似之处。NLRP3和PYRIN炎症体在微管组织中心(MTOC)使用依赖于HDAC6的侵袭体激活机制。
Inflammasomes are supramolecular complexes that play key roles in immune surveillance. This is accomplished by activating inflammatory caspases, which lead to the proteolytic maturation of IL-1β and pyroptosis. Here, we show that NLRP3- and pyrin-mediated inflammasome assembly, caspase activation, and IL-1β conversion occur at the microtubule-organizing center (MTOC). Furthermore, the dynein adaptor HDAC6 is indispensable for the microtubule transport and assembly of these inflammasomes, shown by chemical inhibition and targeted deletion in immortalized and primary macrophages and in mice. Because HDAC6 can transport ubiquitinated pathological aggregates to the MTOC for aggresome formation and autophagosomal degradation, its role in NLRP3 and pyrin inflammasome activation also offers an inherent mechanism to downregulate these inflammasomes by autophagy. This work suggests an unexpected parallel between the formation of physiological and pathological aggregates. The NLRP3 and pyrin inflammasomes use an HDAC6-dependent aggresome-like mechanism for their activation at the microtubule-organizing center (MTOC).
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