title: Molecular basis of the synergistic production of IL-1 receptor antagonist by human neutrophils stimulated with IL-4 and IL-10.
abstract: In this study, we report that the release of IL-1 receptor antagonist (IL-1ra) from IL-4-stimulated neutrophils is markedly enhanced in the presence of IL-10. We also show that up-regulation of IL-1ra release by IL-10 in IL-4-stimulated neutrophils takes place through IL-1ra mRNA stabilization and enhancement of IL-1ra de novo synthesis. Furthermore, we report that the ability of IL-10 to up-regulate IL-1ra mRNA expression in IL-4-treated neutrophils requires 5-6 h and it is preceded by the acquisition of the capacity to activate Stat3 tyrosine phosphorylation. This latter response to IL-10 was strictly dependent on the levels of expression of IL-10R1, which were in fact significantly increased by IL-4 in cultured neutrophils via a signaling pathway sensitive to the serine/threonine kinase inhibitor H-7. Collectively, our data emphasize the central role of IL-10R1 expression in regulating cell responsiveness to IL-10. In addition, the fact that IL-10 strongly up-regulates IL-1ra production in IL-4-activated neutrophils uncovers a novel mechanism whereby IL-10 and IL-4 cooperate to negatively modulate the inflammatory responses.
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine / Q000494:pharmacology; D004268:DNA-Binding Proteins / Q000378:metabolism; D004357:Drug Synergism; D006801:Humans; D053590:Interleukin 1 Receptor Antagonist Protein; D016753:Interleukin-10 / Q000494:pharmacology*; D015847:Interleukin-4 / Q000494:pharmacology*; D008070:Lipopolysaccharides / Q000494:pharmacology; D009504:Neutrophils / Q000378:metabolism*; D010766:Phosphorylation; D012333:RNA, Messenger / Q000032:analysis; D018123:Receptors, Interleukin / Q000235:genetics; D053701:Receptors, Interleukin-10; D050796:STAT3 Transcription Factor; D012795:Sialoglycoproteins / Q000096:biosynthesis* / Q000235:genetics; D015534:Trans-Activators / Q000378:metabolism; D014443:Tyrosine / Q000378:metabolism
chemical_list: D004268:DNA-Binding Proteins; C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D008070:Lipopolysaccharides; D012333:RNA, Messenger; D018123:Receptors, Interleukin; D053701:Receptors, Interleukin-10; D050796:STAT3 Transcription Factor; C494086:STAT3 protein, human; D012795:Sialoglycoproteins; D015534:Trans-Activators; D016753:Interleukin-10; D015847:Interleukin-4; D014443:Tyrosine; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine