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• W2019938444 abstract "Lipopolysaccharide (LPS) is an endotoxin involved in septic shock syndrome and potentiates toxicant-induced liver injury. The effects of LPS on the constitutive and inducible expression of hepatic microsomal epoxide hydrolase (mEH) and glutathione S-transferase (GST) genes were studied in rats. Northern blot analysis showed that treatment of rats with LPS caused suppression in mEH and GST gene expression. The mEH mRNA level was decreased in a time-dependent manner following a single dose of LPS (1 mg/kg, i.v.), resulting in levels of 52%, 22%, 17%, and 94% of those in untreated animals at 2, 6, 12, and 24 hr, respectively. The levels of rGSTA2 and rGSTA3 mRNA were suppressed in response to an LPS injection to the similar extents as observed in mEH mRNA, whereas rGSTM1 and rGSTM2 mRNA levels were less affected. LPS inhibited mEH gene expression at the doses of 1 microg or greater. Whereas treatment of rats with allyl disulfide (ADS), oltipraz (OZ) or pyrazine (PZ) at the dose of 50 mg/kg caused increases in the mEH mRNA level at 12 hr, a concomitant LPS injection (1 mg/kg) resulted in 80%-95% suppression of the inducible gene expression. The inducible rGSTA2, rGSTA3, rGSTM1, and rGSTM2 mRNA levels were also 50%-90% decreased at 12 hr after LPS treatment, with the relative change in rGSTA being greater than that in rGSTM. Three consecutive daily treatments with LPS (10 microg/kg/day) resulted in significant decreases of the constitutive and PZ (50 mg/kg/day, i.p. for 3 days)-inducible mEH and GST mRNA levels, which were consistent with those in the protein levels. Gel shift retardation analysis showed that LPS substantially activated the hepatic nuclear p65/p50 nuclear factor-kappaB (NF-kappaB) complex with the maximal effect observed at 1 hr at the doses of 1 microg/kg or greater. LPS-induced activation of nuclear NF-kappaB (1 microg/kg, i.v.) failed to be inhibited by concomitant treatment with the mEH and GST inducers, including ADS (300 mg/kg, p.o.), OZ (300 mg/kg, p.o.), and PZ (300 mg/kg, i.p.), indicating that NF-kappaB activation was not required for suppression of the gene expression by LPS. In contrast, GdCl3, an inhibitor of mEH and GST expression, inhibited LPS-induced activation of the p65/p50 NF-kappaB. These gel shift analyses provided evidence that LPS-induced activation of the NF-kappaB was not responsible for alterations in the gene expression. In summary, the results of this research demonstrate that LPS effectively inhibits constitutive and inducible mEH and GST expression with decreases in their mRNA levels, and that LPS suppression in the expression of the detoxifying enzymes is not mediated with its activation of NF-kappaB." @default.
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• W2019938444 date "1998-12-01" @default.
• W2019938444 modified "2023-10-12" @default.
• W2019938444 title "Lipopolysaccharide inhibition of rat hepatic microsomal epoxide hydrolase and glutathione S-transferase gene expression irrespective of nuclear factor-κB activation" @default.
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• W2019938444 doi "https://doi.org/10.1016/s0006-2952(98)00204-4" @default.
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