1887

Abstract

Toll-like receptor 4 (TLR4) senses bacterial LPS and is required for the control of systemic serovar Typhimurium infection in mice. The mechanisms of TLR4 activation and its downstream signalling cascades are well described, yet the direct effects on the pathogen of signalling via this receptor remain unknown. To investigate this we used microarray-based transcriptome profiling of intracellular . Typhimurium during infection of primary bone marrow-derived macrophages from wild-type and TLR4-deficient mice. We identified 17 Typhimurium genes that were upregulated in the presence of functional TLR4. Nine of these genes have putative functions in oxidative stress resistance. We therefore examined . Typhimurium gene expression during infection of NADPH oxidase-deficient macrophages, which lack normal oxidative killing mechanisms. We identified significant overlap between the ‘TLR4-responsive’ and ‘NADPH oxidase-responsive’ genes. This is new evidence for a link between TLR4 signalling and NADPH oxidase activity. Interestingly, with the exception of a mutant, Typhimurium strains lacking individual TLR4- and/or oxidative stress-responsive genes were not attenuated during intravenous murine infections. Our study shows that TLR4 activity, either directly or indirectly, induces the expression of multiple stress resistance genes during the intracellular life of Typhimurium.

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2009-09-01
2024-03-28
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