Mycobacterial PPE36 Modulates Host Inflammation by Promoting E3 Ligase Smurf1-Mediated MyD88 Degradation.

Mycobacterial PPE36 Modulates Host Inflammation by Promoting E3 Ligase Smurf1-Mediated MyD88 Degradation.
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DOI:
10.3389/fimmu.2022.690667
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发表时间:
2022
影响因子:
7.3
通讯作者:
Xiong S
Xiong S
中科院分区:
医学2区
文献类型:
--
作者:
Peng Z;Yue Y;Xiong S

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结核分枝杆菌(Mycobacterium tuberculosis,Mtb)PPE 36是一种细胞壁相关蛋白,对Mtb复合群具有高度特异性和保守性。虽然PPE 36已被证明对铁的利用至关重要,但对其在调节宿主免疫反应方面知之甚少。在这里,我们发现PPE 36优先富集Mtb强毒株,并且可以有效抑制宿主炎症反应并增加感染的巨噬细胞和小鼠中的细菌负荷。在探索其潜在机制时,我们发现PPE 36可以通过促进E3连接酶Smurf 1介导的MyD 88蛋白的泛素化和蛋白酶体降解来强烈抑制炎症性NF-κB和MAPK(Erk、p38和Jnk)通路的激活。我们的研究揭示了PPE 36在调节宿主免疫应答方面的一个先前未知的功能,并为开发基于免疫调节的新型结核病治疗策略提供了一些线索。
Mycobacterium tuberculosis (Mtb) PPE36, a cell-wall-associated protein, is highly specific and conserved for the Mtb complex group. Although PPE36 has been proven essential for iron utilization, little is known about it in regulating host immune responses. Here we exhibited that PPE36 was preferentially enriched in Mtb virulent strains and could efficiently inhibit host inflammatory responses and increase bacterial loads in infected macrophages and mice. In exploring the underlying mechanisms, we found that PPE36 could robustly inhibit the activation of inflammatory NF-κB and MAPK (Erk, p38, and Jnk) pathways by promoting E3 ligase Smurf1-mediated ubiquitination and proteasomal degradation of MyD88 protein. Our research revealed a previously unknown function of PPE36 on modulating host immune responses and provided some clues to the development of novel tuberculosis treatment strategies based on immune regulation.
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