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- W2022961667 abstract "Background: Induction of inducible nitric oxide synthase (iNOS) results in nitric oxide (NO) overproduction during endotoxemia. Cellular uptake of l ‐arginine, modulated by the isozymes of type‐2 cationic amino acid transporters (CAT), including CAT‐2, CAT‐2A and CAT‐2B, has been reported to be a crucial factor in the regulation of iNOS activity. We sought to elucidate the expression of CAT‐2 isozymes and the role of nuclear factor‐κB (NF‐κB) in this expression in lipopolysaccharide (LPS)‐treated rat liver. Methods: Adult male Sprague–Dawley rats were randomly given intravenous (i.v.) injections of normal saline (N/S), LPS, LPS preceded by an NF‐κB inhibitor (PDTC, dexamethasone or salicylate) or an NF‐κB inhibitor alone. After injection, rats were sacrificed at different times and enzyme expression and liver injury were examined. Hepatic and systemic NO production were also measured. Results: CAT‐2, CAT‐2A and CAT‐2B were constitutively expressed in un‐stimulated rat liver. LPS stimulation not only significantly increased iNOS mRNA and NO concentrations but also decreased the mRNA concentrations of CAT‐2 and CAT‐2B, but not CAT‐2A, in a time‐dependent manner. LPS‐induced hepatic and systemic NO overproduction was associated with hepatocellular injury. Pre‐treatment with NF‐κB inhibitors significantly attenuated LPS‐induced iNOS induction as well as CAT‐2/CAT‐2B mRNA destabilization, which was associated with significant inhibition of NO biosynthesis and less liver injury. Conclusion: NF‐κB inhibitors stabilize CAT‐2 and CAT‐2B mRNA in LPS‐stimulated rat liver. The hepatic CAT‐2/CAT‐2B pathway may be a constitutive part of cytoprotective mechanisms against sepsis." @default.
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- W2022961667 date "2005-03-17" @default.
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- W2022961667 title "NF-kappaB inhibitors stabilize the mRNA of high-affinity type-2 cationic amino acid transporter in LPS-stimulated rat liver" @default.
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- W2022961667 doi "https://doi.org/10.1111/j.1399-6576.2005.00660.x" @default.
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