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• W2072384207 abstract "Background: The incidence of gram-positive and mixed bacterial infections in surgical patients has increased, and there has been an alarming rise in the number of drug-resistant bacteria. Peptidoglycan (PepG) is a cell wall component of gram-positive bacteria that stimulates inflammatory responses both ex vivo and in vivo. The systemic effects of PepG on inflammation have not been studied in a large animal model. Methods: Anesthetized pigs were subjected to 8-h continuous intravenous infusions of lipopolysaccharide (LPS) (4 mcg/kg/h), PepG (40 mcg/kg/h), LPS plus PepG, or saline. The concentrations of tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6, IL-8, and IL-10 were measured in the plasma prior to infusion (time 0) and thereafter every second hour until the end of the experiments. Heparinized whole blood samples drawn at time 0 and after a 6-h infusion of LPS or PepG were incubated ex vivo with PepG (10 mcg/mL), LPS (10 ng/mL), or a combination of PepG and LPS to study the immunologic consequences of systemic inflammation. Concentrations of TNF-α, IL-8, and IL-1β were measured in the supernatant liquids. Results: In vivo, there was transient upregulation of TNF-α after infusion of LPS, PepG, or the combination. Interleukin-6 and IL-8 were upregulated by LPS but not by PepG. In vitro studies of whole blood obtained at time 0 revealed a synergistic effect of LPS and PepG on the release of TNF-α. Incubation of whole blood obtained after 6 h of infusion of LPS or PepG revealed tolerance and cross-tolerance between the two bacterial components in the induction of TNF-α, IL-8, and IL-1β. Conclusions: Peptidoglycan is a potent inducer of TNF-α in this large animal model. Peptidoglycan and LPS synergized to increase the formation of the proinflammatory cytokine TNF-α. The study demonstrates for the first time the development of tolerance and cross-tolerance between LPS and PepG in a large animal model. These phenomena could be of importance for the signs and symptoms of sepsis." @default.
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• W2072384207 date "2007-10-01" @default.
• W2072384207 modified "2023-10-04" @default.
• W2072384207 title "Activation of Cytokine Synthesis by Systemic Infusions of Lipopolysaccharide and Peptidoglycan in a Porcine Model in Vivo and in Vitro" @default.
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• W2072384207 doi "https://doi.org/10.1089/sur.2006.083" @default.
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