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• W2074896814 startingPage "1155" @default.
• W2074896814 abstract "<h3>Background:</h3> Administration of lipopolysaccharide (LPS) has been shown to increase bacterial translocation (BT) in vivo and in vitro. In addition, LPS up-regulates inducible nitric oxide synthase expression in the intestinal epithelium—a phenomenon that can either enhance microbial killing, or alternatively, promote BT by impairing the gut barrier. <h3>Objective:</h3> To determine the effect, if any, of an inhibitor of nitric oxide synthase, namely, aminoguanidine (AG), on BT after LPS challenge. <h3>Design:</h3> Sprague-Dawley rats were randomized to receive either AG or normal saline solution via subcutaneously placed osmotic pumps (Alzet), followed 18 hours later by LPS injection (5 mg/kg or 20 mg/kg intraperitoneally). Quantitative cultures of the cecum, mesenteric lymph nodes, liver, and spleen were obtained, and plasma nitrite and nitrate levels were measured at 24 hours. Transmembrane potential difference and mucosal permeability to fluorescein isothiocyanate—labeled dextran and fluorescein isothiocyanate—labeled<i>Escherichia</i><i>coli</i>C25 were measured in the Ussing chamber. The intestinal membrane was examined by light, transmission electron, and confocal laser microscopy. <h3>Results:</h3> Rats that were given high-dose LPS had elevated levels of nitrite and nitrate and a 100% incidence of BT. In contrast, AG infusion significantly reduced both BT (22%) and nitrite and nitrate levels. Animals that received LPS and normal saline solution had a significantly lower transmembrane potential difference than those that received LPS and AG. High-dose LPS resulted in sloughing of the apical enterocytes at the villus tips where bacterial entry seemed to occur, as seen with confocal laser microscopy. <h3>Conclusions:</h3> Inhibition of nitric oxide production with AG decreases BT after high-dose LPS challenge. The mechanism may involve increased cellular viability and decreased damage to the gut mucosal barrier in rats that receive AG. Arch Surg. 1996;131:1155-1163" @default.
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• W2074896814 date "1996-11-01" @default.
• W2074896814 modified "2023-10-01" @default.
• W2074896814 title "Inhibition of Nitric Oxide With Aminoguanidine Reduces Bacterial Translocation After Endotoxin Challenge In Vivo" @default.
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• W2074896814 doi "https://doi.org/10.1001/archsurg.1996.01430230037007" @default.
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• W2074896814 hasPublicationYear "1996" @default.
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