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Nitric oxide up-regulates DNA-binding activity of nuclear factor-κB in macrophages stimulated with silica and inflammatory stimulants
- Nitric oxide up-regulates DNA-binding activity of nuclear factor-κB in macrophages stimulated with silica and inflammatory stimulants
- Kang J.L.; Lee K.; Castranova V.
- Ewha Authors
- 이지희; 이경은
- SCOPUS Author ID
- 이지희; 이경은
- Issue Date
- Journal Title
- Molecular and Cellular Biochemistry
- vol. 215, no. 1-2, pp. 1 - 9
- SCI; SCIE; SCOPUS
- Nitric oxide (NO), a reactive nitrogen species, plays an important role in inflammatory lung damage. In the present study, we investigated the role of NO in DNA-binding activity of NF-κB in macrophages stimulated with silica or other inflammatory stimulants. Treatment of mouse macrophages (RAW264.7 cells) with a selective inhibitor of inducible nitric oxide synthase (iNOS), L-N6-(1-iminoethyl) lysine (L-NIL), or a nonselective iNOS inhibitor, Nω-nitro-L-arginine methylester (L-NAME), resulted in inhibition of silica-induced nitric oxide production as well as silica-induced NF-κB activation. L-NIL also effectively inhibited NF-κB activation induced by other inflammatory stimulants, such as lipopolysaccharide (LPS) or muramyl dipeptide (MDP). These inhibitory effects of L-NIL and L-NAME on silica- or LPS-induced NF-κB activation were also observed in primary rat alveolar macrophages. Furthermore, NO generating compounds, such as sodium nitroprusside (SNP) and 3-morpholinosydnonimine (SIN-1), caused a dose-dependent increase in NF-κB activation, which was positively correlated with the level of NO production. Specific inhibitors of protein tyrosine kinase, such as genistein and AG494, prevented NF-κB activation in SNP- or SIN-1 treated cells, suggesting involvement of tyrosine kinase in the NO signaling pathway leading to NF-κB activation. In contrast, inhibitors of protein kinase C or A, such as staurosporine or H89, had no inhibitory effect on SIN-1 induced NF-κB activation. Metalloporphyrins, such as tetrakis (N-methyl-4′-pyridyl) porphyrinato iron (III) (Fe-TMPyP) and Zn-TMPyP which are known to alter NO-dependent activity, markedly inhibited silica- and LPS-induced NF-κB activation. The results suggest that NF-κB activation in macrophages can be induced under certain conditions by nitric oxide and that nitric oxide produced by phagocytes exposed to inflammatory agents may up-regulate the activation of NF-κB.
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