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The role of annexin A1 in the modulation of the NLRP3 inflammasome.
Immunology ( IF 4.9 ) Pub Date : 2020-03-30 , DOI: 10.1111/imm.13184
Izabela Galvão 1 , Renan V H de Carvalho 2 , Juliana P Vago 1 , Alexandre L N Silva 2 , Toniana G Carvalho 3 , Maísa M Antunes 1 , Fabiola M Ribeiro 3 , Gustavo B Menezes 1 , Dario S Zamboni 2 , Lirlândia P Sousa 4 , Mauro M Teixeira 3
Affiliation  

Annexins are well-known Ca2+ phospholipid-binding proteins, which have a wide variety of cellular functions. The role of annexin A1 (AnxA1) in the innate immune system has focused mainly on the anti-inflammatory and proresolving properties through its binding to the formyl-peptide receptor 2 (FPR2)/ALX receptor. However, studies suggesting an intracellular role of AnxA1 are emerging. In this study, we aimed to understand the role of AnxA1 for interleukin (IL)-1β release in response to activators of the nucleotide-binding domain leucine-rich repeat (NLR) and pyrin domain containing receptor 3 (NLRP3) inflammasome. Using AnxA1 knockout mice, we observed that AnxA1 is required for IL-1β release in vivo and in vitro. These effects were due to reduction of transcriptional levels of IL-1β, NLRP3 and caspase-1, a step called NLRP3 priming. Moreover, we demonstrate that AnxA1 co-localize and directly bind to NLRP3, suggesting the role of AnxA1 in inflammasome activation is independent of its anti-inflammatory role via FPR2. Therefore, AnxA1 regulates NLRP3 inflammasome priming and activation in a FPR2-independent manner.

中文翻译:

膜联蛋白A1在调节NLRP3炎性小体中的作用。

膜联蛋白是众所周知的Ca 2+磷脂结合蛋白,其具有多种细胞功能。膜联蛋白A1(AnxA1)在先天免疫系统中的作用主要集中在通过与甲酰肽受体2(FPR2)/ ALX受体结合而具有的消炎和促溶特性。但是,研究表明AnxA1在细胞内的作用正在出现。在这项研究中,我们旨在了解AnxA1在白细胞介素(IL)-1β释放中的作用,该作用是响应核苷酸结合结构域富含亮氨酸的重复序列(NLR)和含吡啶3受体3(NLRP3)炎性小体的激活剂。使用AnxA1基因敲除小鼠,我们观察到AnxA1是体内和体外释放IL-1β所必需的。这些作用归因于IL-1β,NLRP3和caspase-1的转录水平降低,这一步骤称为NLRP3引发。此外,我们证明AnxA1共定位并直接与NLRP3结合,表明AnxA1在炎症小体激活中的作用与其通过FPR2的抗炎作用无关。因此,AnxA1以独立于FPR2的方式调节NLRP3炎性体的启动和激活。
更新日期:2020-04-22
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