HigB of Pseudomonas aeruginosa Enhances Killing of Phagocytes by Up-Regulating the Type III Secretion System in Ciprofloxacin Induced Persister Cells.

HigB of Pseudomonas aeruginosa Enhances Killing of Phagocytes by Up-Regulating the Type III Secretion System in Ciprofloxacin Induced Persister Cells.
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铜绿假单胞菌的 HigB 通过上调环丙沙星诱导的持久细胞中的 III 型分泌系统来增强对吞噬细胞的杀伤

DOI:
10.3389/fcimb.2016.00125
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发表时间:
2016
影响因子:
5.7
通讯作者:
Wu W
Wu W
中科院分区:
医学2区
文献类型:
--
作者:
Li M;Long Y;Liu Y;Liu Y;Chen R;Shi J;Zhang L;Jin Y;Yang L;Bai F;Jin S;Cheng Z;Wu W

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细菌的持留细胞处于休眠状态,对致命的抗生素具有高度耐受性,这被认为是复发和慢性感染的主要原因。细菌毒素-抗毒素系统中毒素的激活抑制细菌的生长,并在持久性形成中起重要作用。然而,很少有人知道毒素激活后的整体基因表达谱。更重要的是,休眠的细菌持久性如何逃避宿主的免疫清除仍然知之甚少。在这里,我们证明了铜绿假单胞菌毒素-抗毒素系统HigB-HigA是环丙沙星诱导的持久性形成所必需的。对higA::Tn突变体的转录组分析揭示了III型分泌系统(T3 SS)基因的上调。HigB的过表达增加了T3 SS基因的表达以及细菌的细胞毒性。我们进一步证明,与营养细菌细胞相比,在环丙沙星处理后存活的野生型细菌含有更高水平的T3 SS蛋白,并显示出对巨噬细胞的细胞毒性增加。这些结果表明,铜绿假单胞菌在持续存在形成期间积累T3 SS蛋白,其可以通过有效地杀死宿主免疫细胞来保护持续存在细胞免受宿主清除。
Bacterial persister cells are dormant and highly tolerant to lethal antibiotics, which are believed to be the major cause of recurring and chronic infections. Activation of toxins of bacterial toxin-antitoxin systems inhibits bacterial growth and plays an important role in persister formation. However, little is known about the overall gene expression profile upon toxin activation. More importantly, how the dormant bacterial persisters evade host immune clearance remains poorly understood. Here we demonstrate that a Pseudomonas aeruginosa toxin-antitoxin system HigB-HigA is required for the ciprofloxacin induced persister formation. Transcriptome analysis of a higA::Tn mutant revealed up regulation of type III secretion systems (T3SS) genes. Overexpression of HigB increased the expression of T3SS genes as well as bacterial cytotoxicity. We further demonstrate that wild type bacteria that survived ciprofloxacin treatment contain higher levels of T3SS proteins and display increased cytotoxicity to macrophage compared to vegetative bacterial cells. These results suggest that P. aeruginosa accumulates T3SS proteins during persister formation, which can protect the persister cells from host clearance by efficiently killing host immune cells.
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