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Type: Journal article
Title: Enhancement of lipopolysaccharide-induced neutrophil oxygen radical production by tumor necrosis factor alpha
Author: Jersmann, H.
Rathjen, D.
Ferrante, A.
Citation: Infection and Immunity, 1998; 66(4):1744-1747
Issue Date: 1998
ISSN: 0019-9567
Abstract: Although tissues become exposed to both exogenous and endogenous cell-activating mediators during infection, there is little appreciation of the effects of subjecting cells to multiple mediators. We examined the hypothesis that the response of neutrophils to bacterial lipopolysaccharide (LPS) is significantly altered in the presence of the endogenous mediator tumor necrosis factor alpha (TNF). The data showed that human neutrophils pretreated with TNF for 10 to 30 min, displayed significantly enhanced superoxide production in response to LPS (from either Escherichia coli K-235 or E. coli O127:B8), measured as lucigenin-dependent chemiluminescence (CL), seen as an increase in the initial peak rate as well as the total CL accumulated over the incubation period. TNF amplified the response to LPS at 1 to 100 U of TNF/10(6) neutrophils and was able to enhance the response to a wide range of concentrations of LPS (0.01 to 1,000 ng/ml). The TNF-induced increase in the LPS response was paralleled by an increase in LPS binding to the neutrophils, which could be abrogated by an anti-CD14 monoclonal antibody. The results demonstrate that TNF significantly increases the LPS-induced release of oxygen radicals in neutrophils through the upregulation of cell surface CD14.
Keywords: Neutrophils
Free Radicals
Tumor Necrosis Factor-alpha
Lipopolysaccharide Receptors
DOI: 10.1128/iai.66.4.1744-1747.1998
Appears in Collections:Aurora harvest 5
Paediatrics publications

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