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. 1997 Mar;90(3):440–447. doi: 10.1111/j.1365-2567.1997.00440.x

Modulatory effect of interleukin-10 on the production of platelet-activating factor and superoxide anions by human leucocytes.

B Bussolati 1, F Mariano 1, G Montrucchio 1, G Piccoli 1, G Camussi 1
PMCID: PMC1456595  PMID: 9155653

Abstract

We observed that human monocytes (MO) and polymorphonuclear neutrophils (PMN) stimulated by lipopolysaccharide (LPS) produce platelet-activating factor (PAF) in a pattern characterized by an early and a delayed peak of synthesis. The early peak of PAF synthesis was due to a direct stimulation of these cells through mCD14 receptor as it was inhibited by anti-CD14 monoclonal antibody. The delayed and sustained peak of PAF synthesis was dependent on protein synthesis and cytokine production as shown by the inhibitory effect of cycloheximide on both MO and PMN, and of anti-tumour necrosis factor-alpha (anti-TNF-alpha) and of anti-interleukin-8 (anti-IL-8) neutralizing antibodies on MO and PMN respectively. IL-10 completely prevented this second, cytokine-dependent peak of PAF synthesis. In contrast, IL-10 markedly enhanced the first peak of PAF synthesis both in MO and PMN. Moreover, IL-10 was shown to modulate the production of superoxide anions (O2-) on both MO and PMN. As suggested by previous studies, IL-10 inhibited the delayed production of O2-. In the present study, we observed that IL-10 directly stimulated an early production of O2-. In addition, IL-10 enhanced the synthesis of O2- by MO and PMN challenged with LPS. The IL-10-induced O2- production was dependent, at least in part, from its effect on PAF synthesis, as it was inhibited by the PAF receptor antagonist WEB 2170. These results suggest that IL-10 may upregulate the early synthesis of PAF and O2- triggered by direct LPS stimulation, whereas it may downregulate the delayed production of these mediators.

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Selected References

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