TcpC inhibits neutrophil extracellular trap formation by enhancing ubiquitination mediated degradation of peptidylarginine deiminase 4.

TcpC inhibits neutrophil extracellular trap formation by enhancing ubiquitination mediated degradation of peptidylarginine deiminase 4.
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TcpC通过增强泛素化介导的肽基精氨酸脱亚胺酶4降解抑制中性粒细胞胞外陷阱形成。

DOI:
10.1038/s41467-021-23881-8
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发表时间:
2021-06-09
影响因子:
16.6
通讯作者:
Pan JP
Pan JP
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ou Q;Fang JQ;Zhang ZS;Chi Z;Fang J;Xu DY;Lu KZ;Qian MQ;Zhang DY;Guo JP;Gao W;Zhang NR;Pan JP

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TcpC是泌尿系致病性大肠杆菌的多功能毒力因子。大肠杆菌(UPEC)。中性粒细胞胞外陷阱形成(NETosis)是中性粒细胞抗感染的重要机制。在这里,我们展示了TcpC对NETosis的影响及其相关机制。我们在分泌TcpC的野生型E. coliCFT073(CFT073wt)和用CFT073wt或重组TcpC(rTcpC)处理的中性粒细胞的LPS诱导的体外NETosis被抑制。rTcpC通过小窝蛋白介导的内吞作用进入中性粒细胞,抑制LPS诱导的ROS、促炎细胞因子和蛋白质的产生,但不抑制肽基精氨酸脱亚胺酶4(PAD 4)的mRNA水平。rTcpC处理增强了蛋白酶体中PAD 4的泛素化和积累。此外,体外泛素化试剂盒分析表明,TcpC是一种以PAD4为靶点的E3泛素连接酶。这些数据表明,TcpC抑制NETosis主要是作为一个E3连接酶,促进降解的PAD4。我们的研究结果提供了一个新的机制TcpC介导的先天免疫逃避。TcpC是一种由尿路致病性大肠杆菌表达的多功能毒力因子。在这里,作者表明,TcpC还通过其E3连接酶功能促进PAD 4的降解来靶向中性粒细胞NETosis,并代表了这种细菌源性毒力因子的额外免疫逃避功能。
TcpC is a multifunctional virulence factor of uropathogenic E. coli (UPEC). Neutrophil extracellular trap formation (NETosis) is a crucial anti-infection mechanism of neutrophils. Here we show the influence of TcpC on NETosis and related mechanisms. We show NETosis in the context of a pyelonephritis mouse model induced by TcpC-secreting wild-type E. coli CFT073 (CFT073wt) and LPS-induced in vitro NETosis with CFT073wt or recombinant TcpC (rTcpC)-treated neutrophils are inhibited. rTcpC enters neutrophils through caveolin-mediated endocytosis and inhibits LPS-induced production of ROS, proinflammatory cytokines and protein but not mRNA levels of peptidylarginine deiminase 4 (PAD4). rTcpC treatment enhances PAD4 ubiquitination and accumulation in proteasomes. Moreover, in vitro ubiquitination kit analyses show that TcpC is a PAD4-targetd E3 ubiquitin-ligase. These data suggest that TcpC inhibits NETosis primarily by serving as an E3 ligase that promotes degradation of PAD4. Our findings provide a novel mechanism underlying TcpC-mediated innate immune evasion. TcpC is a well characterised multifunctional virulence factor expressed by uropathogenic Eschericia coli. Here the authors show that TcpC also targets neutrophil NETosis via its E3 ligase functionality promoting the degradation of PAD4, and represents an additional immune evasion function of this bacterially derived virulence factor.
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