Galactosaminogalactan activates the inflammasome to provide host protection.

Galactosaminogalactan activates the inflammasome to provide host protection.
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半乳糖氨基半乳糖激活炎症小体,提供宿主保护。

DOI:
10.1038/s41586-020-2996-z
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发表时间:
2020-12
期刊:
影响因子:
64.8
通讯作者:
Kanneganti TD
Kanneganti TD
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Briard B;Fontaine T;Samir P;Place DE;Muszkieta L;Malireddi RKS;Karki R;Christgen S;Bomme P;Vogel P;Beau R;Mellado E;Ibrahim-Granet O;Henrissat B;Kalathur RC;Robinson C;Latgé JP;Kanneganti TD

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炎性小体是天然免疫防御的重要前哨,可对多种刺激做出反应,包括病原体相关分子模式(PAMPs)。炎症小体的激活为宿主提供了对曲霉病的防御,曲霉病是免疫低下患者的主要健康问题;然而,负责炎症小体激活的烟曲霉PAMP尚不清楚。在这里,我们发现烟曲霉半乳糖胺半乳糖是一种新型的PAMP,能激活NLRP3炎症体。GAG与核糖体蛋白的结合抑制了细胞翻译机制,从而激活了NLRP3炎症体。半乳糖胺部分与核糖体蛋白结合并阻止细胞翻译,触发NLRP3炎症体激活。在小鼠中,GAG缺陷的曲霉突变株Δgt4c未能诱导保护性炎症体激活,并显示出增强的毒力。此外,给予GAG以依赖炎症的方式保护小鼠免受DSS诱导的结肠炎。因此,核糖体将这种真菌PAMP的感知与天然免疫反应的激活联系起来。
Inflammasomes are important sentinels of innate immune defense activated in response to diverse stimuli, including pathogen-associated molecular patterns (PAMPs). Activation of the inflammasome provides host defense against aspergillosis, a major health concern for immunocompromised patients; however, the Aspergillus fumigatus PAMPs responsible for inflammasome activation are not known. Here we discovered that A. fumigatus galactosaminogalactan (GAG) is a novel PAMP that activates the NLRP3 inflammasome. Binding of GAG to ribosomal proteins inhibited cellular translation machinery, thereby activating the NLRP3 inflammasome. The galactosamine moiety bound to ribosomal proteins and blocked cellular translation, triggering NLRP3 inflammasome activation. In mice, a GAG-deficient Aspergillus mutant Δgt4c failed to elicit protective inflammasome activation and exhibited enhanced virulence. Moreover, administration of GAG protected mice from DSS-induced colitis in an inflammasome-dependent manner. Thus, ribosomes connect sensing of this fungal PAMP to activation of an innate immune response.
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