The development of early host response to Pseudomonas aeruginosa lung infection is critically dependent on myeloid differentiation factor 88 in mice.

The Journal of Biological Chemistry
Melanie R PowerTong-Jun Lin

Abstract

Toll-like receptors (TLR) induce distinct patterns of host responses through myeloid differentiation factor 88 (MyD88)-dependent and/or -independent pathways, depending on the nature of the pathogen. Pseudomonas aeruginosa is a cause of serious lung infection in immunocompromised individuals and cystic fibrosis patients. The role of the TLR-MyD88 pathway in P. aeruginosa-induced lung infection in vivo was examined in this study. MyD88-/- mice demonstrated an impaired clearance of P. aeruginosa from the lung. Little or no neutrophil recruitment was observed in the airways of MyD88-/- mice following P. aeruginosa lung infection. This observation was associated with a reduced production of inflammatory mediators that affect neutrophil recruitment, including macrophage-inflammatory protein-2, tumor necrosis factor, and interleukin-1beta in the airways of MyD88-/- mice. Similarly, MyD88-/- mice showed inhibited NF-kappaB activation in the lung following P. aeruginosa infection. Interestingly, P. aeruginosa infection induced a 7.5-fold increase of TLR2 mRNA expression in the lungs of MyD88+/+ mice. Furthermore, host responses to P. aeruginosa lung infection in TLR2-/- and TLR4 mutant mice were partially inhibited compared with the re...Continue Reading

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