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. 1996 Dec 15;320(Pt 3):1005–1010. doi: 10.1042/bj3201005

Thiol regulation of endotoxin-induced release of tumour necrosis factor alpha from isolated rat Kupffer cells.

B A Neuschwander-Tetri 1, J M Bellezzo 1, R S Britton 1, B R Bacon 1, E S Fox 1
PMCID: PMC1218027  PMID: 9003392

Abstract

Proinflammatory cytokines released by hepatic macrophages (Kupffer cells) have a central role in the pathogenesis of liver injury and the cardiovascular abnormalities of sepsis. Because cytokine release is controlled primarily at the level of gene expression, intracellular signalling mechanisms that control the transcription of cytokine genes are critical links to organ injury. Oxidant stress up-regulates and antioxidants down-regulate the pleiotropic transcription factor NF-kappa B, a DNA-binding protein that induces the expression of cytokines and vascular adhesion molecules. Thiol-bearing molecules are also important inhibitors of NF-kappa B activation, but whether this inhibition represents an antioxidant effect is unknown. This study was undertaken to determine whether important endogenous and pharmacological thiols modulate the activation of NF-kappa B and the release of tumour necrosis factor alpha (TNF-alpha) from Kupffer cells and to ascertain whether these effects are mediated through glutathione. Exposure of rat Kupffer cells to a physiologically relevant concentration of lipopolysaccharide (10 ng/ml) activated NF-kappa B within 1 h and induced the release of TNF-alpha over 5 h. Cellular glutathione content remained unchanged after lipopolysaccharide exposure, but both glutathione monoethyl ester and N-acetyl-L-cysteine increased cellular glutathione levels, blocked NF-kappa B activation and inhibited the release of TNF-alpha. Inhibition of glutathione synthesis prevented the NAC-induced increase in Kupffer cell glutathione, yet it did not prevent the inhibition of TNF-alpha release by NAC. Thus the inhibition of NF-kappa B activation by pharmacological thiols such as NAC might reflect a more general role of the intracellular thiol redox status in NF-kappa B regulation rather than the antioxidant properties of these agents.

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