title: Interleukin-2 inhibits the interleukin-4-induced human IgE and IgG4 secretion in vivo.
abstract: The effect of interleukin-2 (IL-2) on IL-4-induced IgE and IgG4 secretion by B cells in peripheral blood mononuclear cell (PBMC) preparations from non-atopic healthy humans and atopic dermatitis patients was investigated. PBMC were cultured at an optimal concentration of recombinant IL-4 with or without addition of IL-2 for 10 days. Native and recombinant IL-2 inhibited the IL-4-induced IgE and IgG4 secretion in a dose-dependent manner by cells from both normal and atopic donors. Rabbit antibodies to IL-2 or to the monoclonal anti-IL-2 receptor antibody anti-TAC reversed the IL-2 effect. Culturing cells with IL-4 and IL-2 for 1 or 2 days only slightly suppressed the IgE and IgG4 secretion whereas addition of IL-2 to IL-4 containing cultures on day 4 or 5 inhibited the IgE and IgG4 secretion more effectively. This is in contrast to interferon-gamma (IFN-gamma) which inhibited the IL-4 induced IgE and IgG4 secretion when added for the first 24 or 48 h but had no effect when added on days 4 or 5. The data demonstrate that both IL-2 and IFN-gamma act as antagonists in the IL-4-induced IgE and IgG4 secretion by human B cells; while IL-2 appears to inhibit relatively late in culture, IFN-gamma has an early inhibitory effect, suggesting that the two lymphokines inhibit the IL-4 effect by different mechanisms.
authors.affiliation: Department of Immunology, Research Institute of Scripps Clinic, La Jolla, CA.
authors.forename: H L
authors.initials: HL
authors.lastname: Spiegelberg
authors.forename: R J
authors.initials: RJ
authors.lastname: Falkoff
authors.forename: R D
authors.initials: RD
authors.lastname: O'Connor
authors.forename: L
authors.initials: L
authors.lastname: Beck
mesh_terms: D001402:B-Lymphocytes / Q000187:drug effects / Q000276:immunology; D002478:Cells, Cultured; D003876:Dermatitis, Atopic / Q000276:immunology; D005260:Female; D006801:Humans; D007073:Immunoglobulin E / Q000378:metabolism*; D007074:Immunoglobulin G / Q000378:metabolism*; D007371:Interferon-gamma / Q000494:pharmacology; D007376:Interleukin-2 / Q000494:pharmacology*; D015847:Interleukin-4 / Q000494:pharmacology*; D008297:Male
chemical_list: D007074:Immunoglobulin G; D007376:Interleukin-2; D015847:Interleukin-4; D007073:Immunoglobulin E; D007371:Interferon-gamma