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. 1998;7(5):355–361. doi: 10.1080/09629359890884

Effect of mast cell granules on the gene expression of nitric oxide synthase and tumour necrosis factor-alpha in macrophages.

Y Li 1, T D Nguyen 1, A C Stechschulte 1, D J Stechschulte 1, K N Dileepan 1
PMCID: PMC1781868  PMID: 9883971

Abstract

Previous studies have shown that mast cell granules (MCG) inhibit numerous macrophage functions including tumour cytotoxicity, superoxide and nitric oxide (NO) production, and FCgamma2a receptor-mediated phagocytosis. In this study, the effect of MCG on macrophage TNF alpha and nitric oxide synthase (iNOS) mRNA expression, and the production and fate of TNF alpha were examined. Upon activation with LPS+IFN gamma, macrophages expressed both TNF alpha and iNOS mRNA and produced both TNF alpha and NO. Co-incubation of LPS+IFN gamma-activated macrophages with MCG resulted in dose-dependent inhibition of iNOS mRNA expression. TNF alpha production in the activated macrophages was decreased by MCG, which was associated with a reduction in TNF alpha mRNA expression. MCG were also capable of degrading both macrophage-generated and recombinant TNF alpha. The direct effect of MCG on TNF alpha was partially reversed by a mixture of protease inhibitors. These results demonstrate that MCG decrease the production of NO and TNF alpha by inhibiting macrophage iNOS and TNF alpha gene expression. Furthermore, MCG post-transcriptionally alter TNF alpha levels via proteolytic degradation.

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Selected References

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