PMID: 7538077Apr 15, 1995Paper

Hepatocyte-derived interleukin-6 and tumor-necrosis factor alpha mediate the lipopolysaccharide-induced acute-phase response and nitric oxide release by cultured rat hepatocytes

European Journal of Biochemistry
B SaadP Maier

Abstract

The regulation of acute-phase protein production and nitric oxide (NO) release in lipopolysaccharide-induced liver injury is thought to occur in response to monocytes/macrophages and Kupffer-cell-derived cytokines. In this study, we used primary cultured rat hepatocytes maintained as a differentiated phenotype to investigate the direct effects of endotoxin (lipopolysaccharide) on the production of the acute-phase proteins and on NO release. Lipopolysaccharide (10 micrograms/ml) increased the production of alpha 2-macroglobulin 2.5-fold compared to untreated cultures and decreased the production of albumin by 50%. The effect of lipopolysaccharide was mimicked by adding interleukin-6 (IL-6) and tumor-necrosis factor alpha (TNF-alpha), cytokines being induced by treatment of hepatocytes with lipopolysaccharide. Maximal TNF-alpha (600 pg/ml) and IL-6 (1800 pg/ml) concentrations were observed 4 h and 6 h after lipopolysaccharide stimulation, respectively. The lipopolysaccharide-induced acute-phase protein response was blocked by anti-(IL-6) but not by anti-(TNF-alpha) IgG. The latter reduced the lipopolysaccharide-induced IL-6 production by 60%. Besides its effects on the acute-phase proteins, endotoxin caused a significant increase...Continue Reading

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