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

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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
Author(s)
Bok Soo Lee; Yong Man Kim; Hyung Sik Kang; Hwan Mook Kim; Kwang Ho Pyun; In Pyo Choi
Bibliographic Citation
Journal of Biochemistry, vol. 129, no. 1, pp. 77-86
Publication Year
2001
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.
Keyword
Down regulation of iNOSiNOSNOOct-1
ISSN
0021-924X
Publisher
Oxford Univ Press
DOI
http://dx.doi.org/10.1093/oxfordjournals.jbchem.a002839
Type
Article
Appears in Collections:
Division of Biomedical Research > Immunotherapy Research Center > 1. Journal Articles
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