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首页> 外文期刊>Journal of Leukocyte Biology: An Official Publication of the Reticuloendothelial Society >Salmonella virulence factor SipB induces activation and release of IL-18 in human dendritic cells.
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Salmonella virulence factor SipB induces activation and release of IL-18 in human dendritic cells.

机译:沙门氏菌毒力因子SipB诱导人树突状细胞中IL-18的激活和释放。

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摘要

Interleukin-18 (IL-18) plays an important role in innate and acquired immunity, in particular against intracellular pathogens. However, little is known about the microbial factors that trigger IL-18 secretion by dendritic cells (DCs). To determine the influence of bacterial virulence factors on the activation and release of IL-18, we infected human monocyte-derived DCs with virulence mutants of the facultative intracellular pathogen Salmonella typhimurium. Our results show that infection by S. typhimurium causes caspase-1-dependent activation of IL-18 and triggers the release of IL-18 in human DCs. The secretion of IL-18 by the DCs was closely correlated with the ability of the S. typhimurium strains to induce apoptosis. We demonstrate that activation and release of IL-18 are blocked by mutations in the Salmonella sipB gene, which encodes a virulence factor that activates caspase-1 to induce apoptosis. These findings indicate that the activation and release of IL-18 induced by bacterial virulence factors may represent one component of innate immunity against the intracellular bacteria.
机译:白细胞介素18(IL-18)在先天和后天免疫中起着重要作用,特别是针对细胞内病原体。但是,对于触发树突状细胞(DC)分泌IL-18的微生物因子知之甚少。为了确定细菌毒力因子对IL-18激活和释放的影响,我们用兼性细胞内病原体鼠伤寒沙门氏菌的毒力突变体感染了人单核细胞衍生的DC。我们的结果表明,鼠伤寒沙门氏菌感染可导致caspase-1依赖性IL-18活化并触发人DC中IL-18的释放。 DC分泌的IL-18与鼠伤寒沙门氏菌菌株诱导细胞凋亡的能力密切相关。我们证明,IL-18的激活和释放被沙门氏菌sipB基因中的突变所阻止,该基因编码激活caspase-1诱导细胞凋亡的致病因子。这些发现表明由细菌毒力因子诱导的IL-18的激活和释放可能代表针对细胞内细菌的先天免疫的一种成分。

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