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• W2063352679 abstract "Previously, we reported that oxidative stress caused by sulfur amino acid deficiency (SD) induces B cell translocation gene-1 (Btg-1), which belongs to the Apro family, in hepatocytes. In view of the impairment of immune function by protein restriction that causes SD, this study investigated whether SD or other oxidative stress inhibits iNOS and cytokine expression and induces Btg-1 in macrophages and explored the causal relationship of Btg-1 induction and repression of the genes. When macrophages were incubated in sulfur amino acid-deprived medium, lipopolysaccharide induction of iNOS, TNFα, IL-1β, and IL-6 was significantly decreased compared to control. Because AP-1 and NF-κB are the common transcription factors that regulate the genes encoding iNOS and cytokines, we examined AP-1 and NF-κB DNA binding activities and transactivation of the iNOS gene containing the DNA binding elements. Induction of the reporter gene pGL-miNOS-1588 comprising the −1.6 kb iNOS promoter in lipopolysaccharide-activated macrophages was inhibited 30–70% by SD or treatment with pro-oxidants, including tert-butylhydroxyquinone, buthionine sulfoximine, and 3-morpholinosydnonimine. Oxidative stress increased Btg-1 mRNA. SD-induced oxidative stress activated Btg-1 in macrophages, as evidenced by nuclear translocation of endogenous or green fluorescent protein-tagged Btg-1, which localized in the cytoplasm in the resting state. Expression of Btg-1 inhibited lipopolysaccharide-inducible AP-1 and NF-κB activities, repressing transactivation of the target gene pGL-miNOS-1588. These results provide evidence that oxidative stress induced by SD or pro-oxidants inhibits the expression of iNOS and cytokines in macrophages with Btg-1 activation and that the gene repression by oxidative stress may result from Btg-1-mediated inhibition of AP-1 and NF-κB activities." @default.
• W2063352679 created "2016-06-24" @default.
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• W2063352679 date "2005-12-01" @default.
• W2063352679 modified "2023-10-13" @default.
• W2063352679 title "Repression by oxidative stress of iNOS and cytokine gene induction in macrophages results from AP-1 and NF-κB inhibition mediated by B cell translocation gene-1 activation" @default.
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• W2063352679 doi "https://doi.org/10.1016/j.freeradbiomed.2005.07.017" @default.
• W2063352679 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16274887" @default.
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