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. 1990 Jul;58(7):2375–2382. doi: 10.1128/iai.58.7.2375-2382.1990

Cytokine response by monocytes and macrophages to free and lipoprotein-bound lipopolysaccharide.

J M Cavaillon 1, C Fitting 1, N Haeffner-Cavaillon 1, S J Kirsch 1, H S Warren 1
PMCID: PMC258822  PMID: 2114366

Abstract

Recent evidence suggests that bacterial lipopolysaccharide binds to serum lipoproteins in vitro and in vivo and that lipopolysaccharide in the form that is bound to lipoprotein is less biologically active in several experimental models. In order to study the mechanism of this apparent detoxification, we compared the ability of free and lipoprotein-bound lipopolysaccharide from Escherichia coli O18 to stimulate interleukin-1, interleukin-6, and tumor necrosis factor from elicited murine peritoneal macrophages and circulating human monocytes. Lipopolysaccharide bound to lipoprotein was 20- to 1,000-fold less active than the unbound form in inducing the release of each cytokine. We also studied the binding of each form of lipopolysaccharide to the macrophage surface. Lipopolysaccharide complexed to lipoprotein was unable to compete for the binding of radiolabeled heterologous lipopolysaccharide to murine macrophages, and radiolabeled lipopolysaccharide-lipoprotein complexes bound poorly compared with molar equivalents of free lipopolysaccharide. Our experiments suggest that in the process of binding to lipoproteins, lipopolysaccharide may be rendered less toxic through a mechanism of decreased ability to induce monocytes and macrophages to release cytokines, perhaps because of an altered interaction at the cell surface.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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