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Eur Respir J 1994; 7: 657-663
Copyright © ERS Journals Ltd 1994

Original Articles

Production of IL-1 and its receptor antagonist is regulated differently by IFN-gamma and IL-4 in human monocytes and alveolar macrophages

S Sone, E Orino, K Mizuno, S Yano, Y Nishioka, T Haku, A Nii, and T Ogura

Interleukin-4 (IL-4) has previously been found to downregulate interleukin-1 (IL-1) production, but to upregulate the production of IL-1 receptor antagonist (IL-1ra) in human monocytes stimulated with lipopolysaccharide (LPS). In the present study we wanted to determine whether the production of IL-1ra in human monocytes and alveolar macrophages (AMs) is regulated differently at the protein and messenger ribonucleic acid (mRNA) levels by IL-4 and interferon-gamma (IFN-gamma). AMs and monocytes obtained from healthy donors by bronchoalveolar lavage and centrifugal elutriation were stimulated with LPS in the presence or absence of IL-4 or IFN-gamma, and the expression of mRNA for IL-1 and IL-1ra was measured by Northern blot analysis. The production of IL-1 and IL-1ra was quantitated by enzyme immunoassays (EIAs). Spontaneous IL-1ra production was seen in AMs after incubation for 4 h in medium alone, but not in blood monocytes, at both the protein and mRNA levels. The spontaneous expression of the IL-1ra gene in AMs was augmented by incubation with IL-4. Interleukin-1 beta (IL-1 beta) production by LPS-stimulated AMs and monocytes was upregulated by IFN-gamma, but downregulated by IL-4. Interestingly, when stimulated with LPS, IFN-gamma inhibited IL-1ra production by monocytes, but up-regulated its production in human AMs at the protein and mRNA levels.(ABSTRACT TRUNCATED AT 250 WORDS)


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