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. 1993 Mar;91(3):526–531. doi: 10.1111/j.1365-2249.1993.tb05936.x

Human recombinant IL-1 receptor antagonist (IL-1Ra) inhibits leukotriene B4 generation from human monocyte suspensions stimulated by lipopolysaccharide (LPS).

P Conti 1, M R Panara 1, R C Barbacane 1, M Bongrazio 1, R A Dempsey 1, M Reale 1
PMCID: PMC1554727  PMID: 8383025

Abstract

The effect of human recombinant IL-1 receptor antagonist (hrIL-1Ra) on leukotriene B4 (LTB4) release was investigated in activated human monocyte cultures. To stimulate LTB4 generation, LPS was used as an agonist. Detection was performed with the highly sensitive radioimmunoassay method. The cells were treated with scalar concentrations using LPS at 1-1000 ng/ml for different periods of time. The greater LTB4 stimulation was found at LPS 100 ng/ml for 18 h incubation time. Preincubation of monocytes with cytochalasin B (CB) (5 micrograms/ml) for 15 min augmented the release of LTB4 when LPS was used. A dose-dependent inhibition was found when human monocytes were pretreated for 10 min with hrIL-1Ra at different concentrations (0.25-250 ng/ml) and then treated with LPS 100 ng/ml for 18 h. Maximum inhibition was observed at the highest concentration of hrIL-1Ra (250 ng/ml). Macrophages treated with a non-selective 5-lipoxygenase inhibitor, nordihydroguaiaretic acid (NDGA), used at 10 microM, added 15 min before LPS 100 ng/ml, produce a dose-dependent inhibition of LTB4. Cells pretreated with arachidonic acid, at various concentrations (10(-9)-10(-5) M) for 10 min and then treated with LPS 100 ng/ml for 18 h, were also inhibited in a dose-dependent manner by hrIL-1Ra in their production of LTB4. The inhibition of LTB4 release by hrIL-1Ra, in LPS-stimulated human monocytes, may suggest an important modulatory role for this new cytokine (monokine) in inflammation and immunity and may hold future therapeutic implications for diseases involving LTB4 as a mediator.

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Selected References

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