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• W2012161420 endingPage "27" @default.
• W2012161420 startingPage "16" @default.
• W2012161420 abstract "Induction of nitric oxide synthase-2 (iNOS) by cytokines and bacterial products is associated with protein binding at the proximal promoter and in an upstream enhancer region of the Nos2 gene. To clarify how ethanol suppresses rat iNOS activity, we constructed several deletion mutants of the Nos2 promoter fused to the luciferase gene and transfected the constructs into C6 glial cells. Acute ethanol exposure of stably transfected cells for 24 h inhibits induced activity of Nos2 promoter constructs containing deletions in the 5′ flanking region, including a 94 bp promoter that lacks any known NF-κB site but which carries a C/EBPβ and overlapping γ-IRE, GAS and Oct motifs. Ethanol failed to inhibit the endogenous activity of a smaller, 78 bp promoter that lacks the C/EBPβ and overlapping, γ-IRE and GAS motifs and showed no inducible activity. As another approach, in vivo DNA footprinting was used and identified protein protections at five regions of the proximal Nos2 promoter in induced cells. Exposure to acute ethanol diminished protein occupation in the five promoter regions including the γ-IRE/NF-κB and the overlapping γ-IRE/GAS/Oct sites. Site-directed mutagenesis in the octamer domain of the γ-IRE/GAS/Oct motifs was studied in a 1002 bp promoter to examine its role in ethanol inhibition of cytokine and lipopolysaccharide induced activity. The data indicate that ethanol failed to inhibit promoter activity when the Oct motif is missing. Electrophoretic mobility shift assays performed using a 22-mer probe containing the overlapping γ-IRE/GAS/Oct sites showed three complexes with one of the complexes being competed by an octamer-1 antibody. These observations demonstrate the role of protein–DNA binding at the core promoter, and the likely involvement of the octamer motif, in ethanol modulation of cytokine and lipopolysaccharide induced iNOS expression." @default.
• W2012161420 created "2016-06-24" @default.
• W2012161420 creator A5002612394 @default.
• W2012161420 creator A5007419737 @default.
• W2012161420 creator A5019167707 @default.
• W2012161420 date "2007-11-01" @default.
• W2012161420 modified "2023-10-17" @default.
• W2012161420 title "The Oct DNA motif participates in the alcohol inhibition of the inducible nitric oxide synthase gene promoter in rat C6 glioma cells" @default.
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• W2012161420 doi "https://doi.org/10.1016/j.brainres.2007.08.047" @default.
• W2012161420 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2095129" @default.
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