title: Tumor necrosis factor alpha and interleukin-6 production by human mononuclear phagocytes from allergic asthmatics after IgE-dependent stimulation.
abstract: We have previously demonstrated the production of tumor necrosis factor alpha (TNF) and interleukin-6 (IL-6) by alveolar macrophages (AM) from allergic asthmatics developing a late asthmatic reaction after bronchial allergen challenge. In order to explain the modalities of this monokine synthesis, we tested in vitro the effect of an IgE-dependent stimulation on blood monocytes (BM) and AM from control and asthmatic subjects. TNF and IL-6 secretions were evaluated in 24-h supernatants by radioimmunoassay and by the 7TD1 cell proliferation test, respectively. AM from allergic asthmatics secreted spontaneously higher concentrations of TNF and IL-6 than did BM or AM from control subjects. BM from asthmatics also produced spontaneously increased levels of TNF, but at a lesser degree than did AM. The addition of anti-IgE induced a significant increase of TNF and IL-6 secretions by mononuclear phagocytes from control subjects only after previous sensitization with IgE-rich medium. In contrast, the direct stimulation by allergen or anti-IgE of AM and BM from asthmatics enhanced significantly the production of TNF and IL-6 when compared with cells cultured in medium alone. In these conditions, IgE-dependent activation of cells from allergic asthmatics compared with those from control subjects increased monokine production in a similar manner. Costimulation by recombinant human interferon gamma and IgE-dependent triggering had a synergistic effect on TNF production, but it had only an additive action on IL-6 synthesis (respective increase index: 9.8 compared with 2.9 and 9.8 compared with 2.1, respectively, for BM from control and asthmatic subjects).(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: CJF No. 90-06 and CIBP, Unité mixte INSERM 167-CNRS 624, Institut Pasteur, Lille, France.
authors.forename: P
authors.initials: P
authors.lastname: Gosset
authors.forename: A
authors.initials: A
authors.lastname: Tsicopoulos
authors.forename: B
authors.initials: B
authors.lastname: Wallaert
authors.forename: M
authors.initials: M
authors.lastname: Joseph
authors.forename: A
authors.initials: A
authors.lastname: Capron
authors.forename: A B
authors.initials: AB
authors.lastname: Tonnel
mesh_terms: D001249:Asthma / Q000276:immunology*; D015152:Blotting, Northern; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology / Q000276:immunology; D002469:Cell Separation; D004342:Drug Hypersensitivity / Q000276:immunology; D006801:Humans; D007073:Immunoglobulin E / Q000276:immunology*; D007371:Interferon-gamma / Q000494:pharmacology; D015850:Interleukin-6 / Q000032:analysis / Q000096:biosynthesis*; D008262:Macrophage Activation / Q000187:drug effects* / Q000276:immunology; D016676:Macrophages, Alveolar / Q000187:drug effects / Q000276:immunology; D009000:Monocytes / Q000187:drug effects / Q000276:immunology*; D012333:RNA, Messenger / Q000032:analysis; D011994:Recombinant Proteins; D013268:Stimulation, Chemical; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis / Q000096:biosynthesis*
chemical_list: D015850:Interleukin-6; D012333:RNA, Messenger; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha; D007073:Immunoglobulin E; D007371:Interferon-gamma