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Title 

Octamer Binding Protein-1 Is Involved in Inhibition of Inducible Nitric Oxide Synthase Expression by Exogenous Nitric Oxide in Murine Liver Cells

Authors 

Bok Soo LeeYong Man KimHyung Sik KangHwan Mook KimKwang Ho PyunIn Pyo Choi

Publisher 

Oxford University Press

Issue Date 

2001

Citation 

Journal of Biochemistry, vol. 129, no. 1, pp. 77-86

Keywords 

down regulation of iNOSiNOSNOOct-1binding proteinnitric oxide synthaseanimal cellkupffer cellliver cellliver function

Abstract 

Nitric oxide (NO) has diverse effects on immune responses and hepatic functions. In BNL CL.2 cells, the murine embryonic liver cells, inducible nitric oxide synthase (iNOS) mRNA expression appeared after 3 h of treatment with IFN-γ and LPS. Interestingly, mRNA and protein expression of iNOS was down-regulated by sodium nitroprusside (SNP) and diethylamine dinitric oxide in a time- and dose-dependent manner, but not by H2O2. TNF-α gene expression was also dramatically reduced by SNP, but IL-6 gene expression was inhibited much less. IFN-γ and LPS-induced chloramphenicol acetyltransferase activity of iNOS promoter constructs was inhibited by SNP. Electrophoretic mobility shift assay showed that SNP inhibited IFN-γ plus LPS-induced Oct-1 binding activity, and the inhibition was reversed by DTT. Mutation in the Oct-1 site completely abolished iNOS promoter activity. In addition, supershift assay and Southwestern analysis demonstrated that the Oct-1 binding activity was inhibited by SNP. Taken together, these results indicate that NO suppresses IFN-γ plus LPS-induced iNOS expression, and that Oct-1 is an important element in this process.

ISSN 

0021-924X

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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