The NLRP6 Inflammasome Recognizes Lipoteichoic Acid and Regulates Gram-Positive Pathogen Infection.

The NLRP6 Inflammasome Recognizes Lipoteichoic Acid and Regulates Gram-Positive Pathogen Infection.
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DOI:
10.1016/j.cell.2018.09.047
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发表时间:
2018-11-29
期刊:
影响因子:
64.5
通讯作者:
Núñez G
Núñez G
中科院分区:
生物学1区
文献类型:
--
作者:
Hara H;Seregin SS;Yang D;Fukase K;Chamaillard M;Alnemri ES;Inohara N;Chen GY;Núñez G

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The activator and composition of the NLRP6 inflammasome remain poorly understood. We find that lipoteichoic acid (LTA), a molecule produced by Gram-positive bacteria, binds and activates NLRP6. In response to cytosolic LTA or infection with Listeria monocytogenes, NLRP6 recruited caspase-11 and caspase-1 via the adaptor ASC. NLRP6 activation by LTA induced processing of caspase-11, which promoted caspase-1 activation and IL-1β/IL-18 maturation in macrophages. Nlrp6−/− and Casp11−/− mice were less susceptible to Listeria monocytogenes infection, which was associated with reduced pathogen loads and impaired IL-18 production. Administration of IL-18 to Nlrp6−/− or Casp11−/− mice restored the susceptibility of mutant mice to Listeria monocytogenes infection. These results reveal a previously unrecognized innate immunity pathway triggered by cytosolic LTA that is sensed by NLRP6 and exacerbates systemic Gram-positive pathogen infection via the production of IL-18. Lipoteichoid acid produced by Gram-negative bacteria is sensed by the NLRP6 inflammasome and leads to the activation of both caspase-1 and caspase-11, exacerbating infection
朊病毒样聚合是抗病毒免疫防御和炎症小体激活中信号转导的基础。
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