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• W2165931899 abstract "Small amounts of exogenous lipopolysaccharide (LPS) (10 ng/kg-100 microg/kg) enhance the hepatotoxicity of allyl alcohol in male Sprague-Dawley rats. This augmentation of allyl alcohol hepatotoxicity appears to be linked to Kupffer cell function, but the mechanism of Kupffer cell involvement is unknown. Since Kupffer cells produce tumor necrosis factor-alpha (TNF alpha) upon exposure to LPS, and this cytokine has been implicated in liver injury from large doses of LPS, we tested the hypothesis that TNF alpha contributes to LPS enhancement of allyl alcohol hepatotoxicity. Rats were treated with LPS (10-100 microg/kg iv) 2 h before allyl alcohol (30 mg/kg ip). Co-treatment with LPS and allyl alcohol caused liver injury as assessed by an increase in activity of alanine aminotransferase in plasma. Treatment with LPS caused an increase in plasma TNF alpha concentration, which was prevented by administration of either pentoxifylline (PTX) (100 mg/kg iv) or anti-TNF alpha serum (1 ml/rat iv) one h prior to LPS. Only PTX protected rats from LPS-induced enhancement of allyl alcohol hepatotoxicity; anti-TNF alpha serum had no effect. Exposure of cultured hepatocytes to LPS (1-10 microg/ml) or to TNF alpha (15-150 ng/ml) for 2 h did not increase the cytotoxicity of allyl alcohol (0.01-200 microM). These data suggest that neither LPS nor TNF alpha alone was sufficient to increase the sensitivity of isolated hepatocytes to allyl alcohol. Furthermore, hepatocytes isolated from rats treated 2 h earlier with LPS (i.e., hepatocytes which were exposed in vivo to TNF alpha and other inflammatory mediators) were no more sensitive to allyl alcohol-induced cytotoxicity than hepatocytes from naïve rats. These data suggest that circulating TNF alpha is not involved in the mechanism by which LPS enhances hepatotoxicity of allyl alcohol and that the protective effect of PTX may be due to another of its biological effects." @default.
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• W2165931899 date "2000-07-01" @default.
• W2165931899 modified "2023-10-18" @default.
• W2165931899 title "Pentoxifylline Attenuates Bacterial Lipopolysaccharide-Induced Enhancement of Allyl Alcohol Hepatotoxicity" @default.
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• W2165931899 doi "https://doi.org/10.1093/toxsci/56.1.203" @default.
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