Invasive Salmonella exploits divergent immune evasion strategies in infected and bystander dendritic cell subsets.

Invasive Salmonella exploits divergent immune evasion strategies in infected and bystander dendritic cell subsets.
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DOI:
10.1038/s41467-018-07329-0
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发表时间:
2018-11-19
影响因子:
16.6
通讯作者:
Simmons A
Simmons A
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Aulicino A;Rue-Albrecht KC;Preciado-Llanes L;Napolitani G;Ashley N;Cribbs A;Koth J;Lagerholm BC;Ambrose T;Gordon MA;Sims D;Simmons A

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非细类沙门氏菌(NTS)是高度普遍的食源性病原体。最近,一种高度侵入性的多药耐药性孢子虫(ST313)成为儿童和免疫抑制成人菌血症的主要原因,但是病原机制尚不清楚。在这里,我们利用侵入性和非侵入性沙门氏菌菌株与单细胞RNA测序相结合,研究与发散侵入性ST313有关的个体感染和旁观者单核细胞衍生的树突状细胞(MODC)的转录组。与非侵入性沙门氏菌相比,ST313指导高度异质的先天免疫反应。旁观者MODC表现出一个过度激活的特征,可能会转移适应性免疫,从受感染细胞中转移。具有侵入性沙门氏菌的MODC表现出较高的IL10和MARCH1与CD83表达较低的表达,以逃避适应性免疫检测。最后,我们证明了这些机制如何共同限制MODC介导的沙门氏菌特异性CD4+ T细胞克隆的激活。在这里,我们展示了侵入性ST313如何利用感染和旁观者MODC内的离散逃避策略来介导其在体内的传播。 沙门氏菌采用一系列策略来抵抗感染期间的宿主防御能力。在这里,Aulicino等。使用单细胞RNA测序检查沙门氏菌的侵入性和非侵入性菌株的影响,揭示了感染和旁观者树突状细胞中的离散和发散的免疫逃避策略。
Non-typhoidal Salmonella (NTS) are highly prevalent food-borne pathogens. Recently, a highly invasive, multi-drug resistant S. Typhimurium, ST313, emerged as a major cause of bacteraemia in children and immunosuppressed adults, however the pathogenic mechanisms remain unclear. Here, we utilize invasive and non-invasive Salmonella strains combined with single-cell RNA-sequencing to study the transcriptome of individual infected and bystander monocyte-derived dendritic cells (MoDCs) implicated in disseminating invasive ST313. Compared with non-invasive Salmonella, ST313 directs a highly heterogeneous innate immune response. Bystander MoDCs exhibit a hyper-activated profile potentially diverting adaptive immunity away from infected cells. MoDCs harbouring invasive Salmonella display higher expression of IL10 and MARCH1 concomitant with lower expression of CD83 to evade adaptive immune detection. Finally, we demonstrate how these mechanisms conjointly restrain MoDC-mediated activation of Salmonella-specific CD4+ T cell clones. Here, we show how invasive ST313 exploits discrete evasion strategies within infected and bystander MoDCs to mediate its dissemination in vivo. Salmonella employ a range of strategies to counter host defences during infection. Here, Aulicino et al. use single-cell RNA-sequencing to examine the effects of invasive and non-invasive strains of Salmonella, revealing discrete and divergent immune evasion strategies in infected and bystander dendritic cells.
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