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      Exogenous Nitric Oxide Inhibits Tumor Necrosis Factor-Alpha- or Interleukin-1-Beta-Induced Monocyte Chemoattractant Protein-1 Expression in Human Mesangial Cells


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          Monocyte chemoattractant protein-1 (MCP-1) plays an important role in glomerulonephritis and nitric oxide (NO) exerts a variety of renal pathophysiological effects. We investigated the effect of exogenous NO on pro-inflammatory cytokine-induced MCP-1 expression in human mesangial cells and its signal transduction pathway. Cells were pretreated with NO donors such as 3-morpholino-sydnonimine (SIN-1) or nitroprusside, and then stimulated with tumor necrosis factor-α (TNF-α) or interleukin-1β (IL-1β). MCP-1 expression of mRNA and protein were measured by Northern blot analysis and ELISA. NF-ĸB binding activity was determined by electrophoretic mobility shift assay. Degradation of IĸB-α protein was assessed by Western blot analysis. SIN-1 inhibited TNF-α- or IL-1β-induced MCP-1 mRNA expression in a dose-dependent manner and also suppressed the MCP-1 protein expression. Nitroprusside inhibited the MCP-1 mRNA expression as well. SIN-1 dose dependently inhibited the TNF-α- or IL-1β-induced NF-ĸB binding activity and suppressed the TNF-α-induced degradation of IĸB-α. Analogue of cGMP (8-bromo-cGMP) had no significant effect on TNF-α-induced MCP-1 mRNA expression and guanylate cyclase inhibitor (ODQ) also had no significant influence on the inhibitory effect of SIN-1. These results suggest that exogenous NO inhibits MCP-1 expression via suppression of NF-ĸB by reducing the degradation of IĸB-α and through a cGMP-independent pathway.

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          Costimulation of fibroblast collagen and transforming growth factor beta1 gene expression by monocyte chemoattractant protein-1 via specific receptors.

          Recent studies indicate potential roles of monocyte chemotactic protein-1 (MCP-1) in recruitment of monocytes to sites of inflammation. However, their increased expression does not always correlate with monocyte influx, suggesting other possible biological activities for this member of the C-C chemokine family. In view of its potential role in regulating extracellular matrix expression in fibrotic disorders, the effects of MCP-1 on lung fibroblast collagen expression were evaluated. Isolated rat lung fibroblasts were treated with increasing doses of MCP-1 for variable periods of time and examined for effects on collagen synthesis and expression of procollagen alpha1(I) mRNA expression. The results show that MCP-1 was able to stimulate collagen expression in these cells in a dose-dependent manner but required over 24 h for significant elevation to occur. In view of this delayed time course, the possibility of mediation via endogenous transforming growth factor beta (TGFbeta) was tested by the ability of anti-TGFbeta antibody to inhibit this MCP-1 stimulation of collagen expression. Significant but incomplete inhibition by this antibody was observed. Pretreatment of the cells with antisense but not by sense or missense TGFbeta1 oligodeoxyribonucleotides caused essentially complete inhibition of this MCP-1 stimulatory effect. Furthermore, MCP-1 treatment was found to also stimulate TGFbeta secretion and mRNA expression, which was also abolished by pretreatment with antisense TGFbeta1 oligodeoxyribonucleotides. The kinetics of TGFbeta expression indicates that significant increase preceded that for collagen expression. Binding studies using 125I-labeled MCP-1 indicated the presence of specific and saturable binding sites with a dissociation constant consistent with the dose response curves for stimulation of fibroblast collagen synthesis and TGFbeta activity by MCP-1. These results taken together suggest that MCP-1 stimulates fibroblast collagen expression via specific receptors and endogenous up-regulation of TGFbeta expression. The latter then results in autocrine and/or juxtacrine stimulation of collagen gene expression.
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            Induction and Stabilization of IκBα by Nitric Oxide Mediates Inhibition of NF-κB

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              Human monocyte chemoattractant protein-1 (MCP-1).


                Author and article information

                S. Karger AG
                October 2002
                18 October 2002
                : 92
                : 4
                : 780-787
                aDepartment of Internal Medicine, Urology, and bAsan Institute for Life Sciences, College of Medicine, University of Ulsan, Seoul, Korea
                65441 Nephron 2002;92:780–787
                © 2002 S. Karger AG, Basel

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                : 20 February 2002
                Page count
                Figures: 7, References: 32, Pages: 8
                Self URI (application/pdf): https://www.karger.com/Article/Pdf/65441
                Self URI (text/html): https://www.karger.com/Article/FullText/65441
                Self URI (journal page): https://www.karger.com/SubjectArea/Nephrology
                Original Paper

                Cardiovascular Medicine,Nephrology
                3-Morpholino-sydnonimine,IĸB-alpha,Mesangial cells,Monocytechemoattractant protein-1,Nuclear factor-ĸB


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