Interleukin-4 suppresses inflammatory cytokine gene transcription in porcine macrophages

Y. Zhou, G. Lin, M. J. Baarsch, R. W. Scamurra, Michael P Murtaugh

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Inflammatory cytokines, including interleukin (IL)-1α, IL-1β, IL-8, and tumor necrosis factor α (TNF-α) are produced by macrophages in response to a variety of pathogenic stimuli. We show here that the expression of inflammatory cytokines is suppressed by IL-4 at the transcriptional level. Interleukin-4, when added together with bacterial lipopolysaccharide (LPS), suppressed LPS-induced increases in mRNA levels of IL-1α IL-1β, IL-8, and TNF-α in alveolar macrophages. The level of suppression was dependent on dose and time of exposure and reached a maximum of 75-80% of uninduced values for IL-1α, IL-8, and TNF. Interleukin-1β expression was completely inhibited by IL-4. The amount of secreted protein, as determined by TNF-α bioassay, was also suppressed by IL-4. Half-maximal suppression occurred at IL-4 concentrations between 0.02 and 0.1 ng/ml for all inflammatory cytokines. Nuclear run-on assays showed that IL-4 suppressed transcriptional activity of all inflammatory cytokines. Messenger RNA stability was not changed by IL-4. The data suggest that IL-4 plays an important transcriptional role in the regulation of alveolar macrophage inflammatory activities in respiratory disease and raise the possibility that IL-4 may function in vivo as a coordinator of inflammatory and immune responses.

Original languageEnglish (US)
Pages (from-to)507-513
Number of pages7
JournalJournal of Leukocyte Biology
Volume56
Issue number4
DOIs
StatePublished - Jan 1 1994

Keywords

  • Cytokines
  • Gene expression
  • Interleukin-4
  • Macrophages
  • Swine

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