TLR signaling is required for Salmonella typhimurium virulence.

TLR signaling is required for Salmonella typhimurium virulence.
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DOI:
10.1016/j.cell.2011.01.031
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发表时间:
2011-03-04
期刊:
影响因子:
64.5
通讯作者:
Barton GM
Barton GM
中科院分区:
生物学1区
文献类型:
--
作者:
Arpaia N;Godec J;Lau L;Sivick KE;McLaughlin LM;Jones MB;Dracheva T;Peterson SN;Monack DM;Barton GM

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toll样受体(TLRs)有助于宿主对微生物病原体的抗性,并推动毒力机制的进化。我们使用具有Nramp-1基因功能等位基因和缺乏TLRs组合的小鼠研究了宿主抗性与病原体毒力之间的关系。TLR2和TLR4均缺失的小鼠对鼠伤寒沙门菌高度敏感,这与先天免疫功能降低一致。然而,缺乏参与鼠伤寒沙门氏菌识别的额外tlr的小鼠对感染的易感性较低。在这些tlr缺陷细胞中,细菌不能上调沙门氏菌致病性岛2 (SPI-2)基因,也不能形成复制区。我们证明,TLR信号可以提高含吞噬体沙门氏菌的酸化速率,抑制这种酸化可以阻止SPI-2的诱导。我们的研究结果表明,鼠伤寒沙门氏菌需要先天免疫系统的提示来调节细胞内生存、生长和全身感染所必需的毒力基因。
Toll-like receptors (TLRs) contribute to host resistance to microbial pathogens and drive the evolution of virulence mechanisms. We have examined the relationship between host resistance and pathogen virulence using mice with a functional allele of the Nramp-1 gene and lacking combinations of TLRs. Mice deficient in both TLR2 and TLR4 were highly susceptible to the intracellular bacterial pathogen Salmonella typhimurium, consistent with reduced innate immune function. However, mice lacking additional TLRs involved in S. typhimurium recognition were less susceptible to infection. In these TLR-deficient cells, bacteria failed to upregulate Salmonella pathogenicity island 2 (SPI-2) genes and did not form a replicative compartment. We demonstrate that TLR signaling enhances the rate of acidification of the Salmonella containing phagosome, and inhibition of this acidification prevents SPI-2 induction. Our results indicate that S. typhimurium requires cues from the innate immune system to regulate virulence genes necessary for intracellular survival, growth, and systemic infection.
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