The E3 ubiquitin ligase TRIM31 attenuates NLRP3 inflammasome activation by promoting proteasomal degradation of NLRP3.

The E3 ubiquitin ligase TRIM31 attenuates NLRP3 inflammasome activation by promoting proteasomal degradation of NLRP3.
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E3 泛素连接酶 TRIM31 通过促进 NLRP3 的蛋白酶体降解来减弱 NLRP3 炎症小体的激活

DOI:
10.1038/ncomms13727
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发表时间:
2016-12-08
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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NLRP3炎症体在宿主防御微生物病原体中起着基础性作用,它的失控可能导致多种炎症性疾病。NLRP3蛋白的表达是炎症体激活的限速步骤,因此必须严格控制其表达,以维持免疫平衡,避免不良影响。然而,NLRP3的表达是如何调控的在很大程度上仍不清楚。在本研究中,我们发现E3泛素连接酶TRIM31是NLRP3炎症体的反馈抑制因子。TRIM31直接与NLRP3结合,促进K48连接的多泛素化和NLRP3的蛋白酶体降解。因此,在体内,TRIM31缺乏增强了NLRP3炎症体的激活,并加重了明矾诱导的腹膜炎。此外,TRIM31缺乏减轻了葡聚糖硫酸钠(DSS)诱导的结肠炎的严重程度,这是一种炎症性肠病模型,NLRP3在其中具有保护作用。因此,我们的研究描述了TRIM31在生理条件下限制NLRP3炎症体活性的机制,并建议TRIM31作为干预NLRP3炎症体相关疾病的潜在治疗靶点。NLRP3炎症体控制宿主对病原体的反应;需要精确的调节来限制自身免疫性疾病。在这里,作者发现了E3连接酶TRIM31,它有助于泛素介导的NLRP3蛋白酶体的降解,这可能是缓解疾病的治疗靶点。
The NLRP3 inflammasome has a fundamental role in host defence against microbial pathogens and its deregulation may cause diverse inflammatory diseases. NLRP3 protein expression is a rate-limiting step for inflammasome activation, thus its expression must be tightly controlled to maintain immune homeostasis and avoid detrimental effects. However, how NLRP3 expression is regulated remains largely unknown. In this study, we identify E3 ubiquitin ligase TRIM31 as a feedback suppressor of NLRP3 inflammasome. TRIM31 directly binds to NLRP3, promotes K48-linked polyubiquitination and proteasomal degradation of NLRP3. Consequently, TRIM31 deficiency enhances NLRP3 inflammasome activation and aggravates alum-induced peritonitis in vivo. Furthermore, TRIM31 deficiency attenuates the severity of dextran sodium sulfate (DSS)-induced colitis, an inflammatory bowel diseases model in which NLRP3 possesses protective roles. Thus, our research describes a mechanism by which TRIM31 limits NLRP3 inflammasome activity under physiological conditions and suggests TRIM31 as a potential therapeutic target for the intervention of NLRP3 inflammasome related diseases. The NLRP3 inflammasome controls the response of the host to pathogens; precise regulation is required to limit autoimmune diseases. Here, the authors identify the E3 ligase TRIM31 that aids the ubiquitin-mediated proteasomal degradation of NLRP3, which may be a therapeutic target for alleviating disease.
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