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Suppression of inducible nitric oxide synthase and tumor necrosis factor-alpha expression by 4-nonylphenol in macrophages.

Abstract：

:4-Nonylphenol (NP) is reported to have estrogenic activity; however, its influence on cytokine production or immune system function remains unclear. In this study we investigated the effects of NP on the production of nitric oxide (NO) and tumor necrosis factor-alpha (TNF-alpha), and on the level of inducible nitric oxide synthase (iNOS) and TNF-alpha gene expression in mouse macrophages. NP alone did not affect NO or TNF-alpha production. In contrast, NP inhibited lipopolysaccharide (LPS)-induced NO and TNF-alpha production, and the levels of iNOS and TNF-alpha mRNA in a dose-dependent manner. Treatment with ICI 182.780, an estrogen-receptor antagonist, inhibited the suppressive effects of NP. NF-kappaB sites have been identified in the promoter of the iNOS and TNF-alpha genes. Transient expression and electrophoretic mobility shift assays with NF-kappaB binding sites revealed that NP reduced the levels of the LPS-induced NF-kappaB transcription factor complex. These results demonstrate that NP may affect the regulation of the immune system function by reducing NO and TNF-alpha production via the inhibition of NF-kappaB transactivation mediated through the estradiol receptor.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

You HJ,Choi CY,Jeon YJ,Chung YC,Kang SK,Hahm KS,Jeong HG

doi

10.1016/S0006-291X(02)00550-8

subject

Has Abstract

pub_date

2002-06-21 00:00:00

pages

753-9

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(02)00550-8

journal_volume

294

pub_type

杂志文章

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