The Journal of Immunology, Vol 151, Issue 7 3758-3766, Copyright © 1993 by American Association of Immunologists

ARTICLES

Enhanced production of LPS-induced cytokines during differentiation of human monocytes to macrophages. Role of LPS receptors

S Gessani, U Testa, B Varano, P Di Marzio, P Borghi, L Conti, T Barberi, E Tritarelli, R Martucci and D Seripa
Department of Virology, Istituto Superiore di Sanita, Rome, Italy.

In vitro cultivated human monocytes isolated from normal peripheral blood show a time-dependent differentiation into macrophages characterized by an increased expression of transferrin receptors, CD11/CD18, and CD14 Ag. We measured the secretion of TNF-alpha and IL-6 in freshly isolated monocytes and in differentiated macrophages after LPS treatment. Differentiated macrophages produced significantly higher amounts of TNF-alpha and IL-6 than freshly isolated monocytes. This increased secretion was not a result of an enhanced accumulation of TNF- alpha and IL-6 mRNA, as comparative levels of these transcripts were found in both cell types after LPS treatment. Furthermore, LPS did not induce an antiviral state to VSV3 in monocytes, but it reduced by 3 to 5 log10 the virus yield in differentiated macrophages. The addition of antibodies to IFN-beta completely inhibited the LPS-induced antiviral state to VSV, but antibodies to IFN-alpha, TNF-alpha, or IL-6 were ineffective. A marked accumulation of IFN-beta mRNA was found in both cell types after LPS treatment. Binding experiments with FITC-LPS revealed a slightly higher overall binding affinity for LPS in freshly explanted monocytes as compared with differentiated macrophages, even though the maximal binding was higher in macrophages. In both cell types, the LPS binding was partially inhibited by antibodies to CD14. These results demonstrate that: 1) in vitro differentiation of human monocytes to macrophages leads to an enhanced LPS response in terms of (a) progressive increase of IL-6/TNF-alpha production and (b) acquisition of an IFN-beta mediated antiviral state; 2) this enhanced response to LPS, largely CD14-independent, is not linked to any increased accumulation of cytokine mRNA, but is probably a result of an increased synthesis and/or secretion of these cytokines.

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