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- W2077876592 abstract "Haemorrhage-induced immunosuppression has been linked to nosocomial infections. We assessed the impact of monophosphoryl lipid A, a Toll/interleukin-1 receptor-domain-containing adaptor protein inducing interferon-biased Toll-like receptor-4 agonist currently used as a vaccine adjuvant in humans, on post-haemorrhage susceptibility to infection. We used a mouse model of post-haemorrhage pneumonia induced by methicillin-susceptible Staphylococcus aureus. Monophosphoryl lipid A was administered intravenously after haemorrhage and before pneumonia onset. Haemorrhage altered survival rate, increased lung damage (neutrophil accumulation, oedema and cytokine release) and altered the functions of dendritic and natural killer cells. Here, we show that monophosphoryl lipid A decreased systemic dissemination of S. aureus and dampened inflammatory lung lesions. Monophosphoryl lipid A partially restored the capacity for antigen presentation and the transcriptional activity in dendritic cells. Monophosphoryl lipid A did not restore the interferon-γ mRNA but prevented interleukin-10 mRNA overexpression in natural killer cells compared with untreated mice. Ex vivo monophosphoryl lipid A-stimulated dendritic cells or natural killer cells harvested from haemorrhaged animals were adoptively transferred into mice undergoing post-haemorrhage pneumonia. Stimulated dendritic cells (but not stimulated natural killer cells) improved the survival rate compared with mice left untreated. In vivo depletion of natural killer cells decreased survival rate of monophosphoryl lipid A-treated mice. Dendritic and natural killer cells are critically involved in the beneficial effects of monophosphoryl lipid A within post-haemorrhage pneumonia." @default.
- W2077876592 created "2016-06-24" @default.
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- W2077876592 date "2013-01-11" @default.
- W2077876592 modified "2023-10-13" @default.
- W2077876592 title "Toll-like receptor-4 agonist in post-haemorrhage pneumonia: role of dendritic and natural killer cells" @default.
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- W2077876592 doi "https://doi.org/10.1183/09031936.00152612" @default.
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