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J Exp Med. Dec 1, 1993; 178(6): 2207–2211.
PMCID: PMC2191270

Interleukin 10 (IL-10) inhibits the release of proinflammatory cytokines from human polymorphonuclear leukocytes. Evidence for an autocrine role of tumor necrosis factor and IL-1 beta in mediating the production of IL-8 triggered by lipopolysaccharide

Abstract

In this study we have examined the effects of interleukin 10 (IL-10) on polymorphonuclear leukocytes (PMN), and found that it is a potent inhibitor of tumor necrosis factor (TNF), IL-1 beta, and IL-8 secretion triggered by lipopolysaccharide (LPS). Cytokine production by phagocytosing PMN was also inhibited by IL-10, but to a lesser extent than the LPS-induced production. As shown by Northern blot analysis, IL- 10 diminished the levels of TNF, IL-1 beta, and IL-8 mRNAs late after the onset of stimulation of PMN with LPS. In addition, we provide evidence that the kinetics of LPS-induced IL-8 production by PMN is composed of two distinct phases. Specifically, our experiments demonstrated that in the first phase, the production of IL-8 is a process directly induced by LPS that lasts for some hours. After this early wave, a second phase begins that is sustained and leads to an elevated production of IL-8 that appears to be due to the endogenous release of TNF and IL-1 beta. This second wave can in fact be blocked by anti-TNF and anti-IL-1 beta neutralizing antibodies, and by IL-10 as the consequence of its downregulatory effects on TNF and IL-1 beta release. Taken together, these findings identify novel biological actions of IL-10 as a suppressor of the inflammatory response.

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Selected References

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