title: Cell-cell interactions for CD23 expression and soluble CD23 release from peripheral lymphocytes of atopic donors.
abstract: The cell-cell interactions for CD23 expression and soluble (s)CD23 release from peripheral blood lymphocytes (PBL), as well as purified cells (B, T cells, monocytes) of atopic donors, were studied. Cells either stimulated combined and subsequently separated or stimulated after separation were analysed. IL-4, IL-2, phytohaemagglutinin (PHA), interferon-gamma (IFN-gamma) and the combined interaction of IL-4 and IFN-gamma as well as PHA and IFN-gamma were used as stimuli. sCD23 release in the cell supernatant was determined from cells separated before stimulation. CD23 expression induced by IL-4 on cells stimulated and subsequently separated was significantly lower compared with amounts on separated cells which were subsequently stimulated. Major expression of CD23 was obtained on B cells and monocytes. Stimulation with PHA led to an increased expression on T cells compared to the control. When cells were stimulated, combined and separated, the combined stimuli of IL-4 and IFN-gamma showed a reduced CD23 expression for both experimental procedures and an enhanced release of sCD23. The data suggest an important role for cell-cell interactions. These results were supported by experiments in which separated cells were either co-cultured or cultured in Transwells. Co-culture of T cells with B cells and monocytes suggested that T cells are responsible for suppressed CD23 expression. No or only slight enhancement was obtained for sCD23 release. Our data indicate that cell-cell interactions and cytokines regulate CD23 expression, while sCD23 release is apparently solely regulated by soluble mediators (e.g. cytokines).
authors.affiliation: Institut für Medizinische Mikrobiologie und Immunologie, Ruhr-Universität Bochum, FRG.
authors.forename: K
authors.initials: K
authors.lastname: Kicza
authors.forename: A
authors.initials: A
authors.lastname: Fischer
authors.forename: T
authors.initials: T
authors.lastname: Pfeil
authors.forename: J
authors.initials: J
authors.lastname: Bujanowski-Weber
authors.forename: W
authors.initials: W
authors.lastname: König
mesh_terms: D000944:Antigens, Differentiation, B-Lymphocyte / Q000032:analysis / Q000378:metabolism*; D001249:Asthma / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology; D002450:Cell Communication; D006801:Humans; D007073:Immunoglobulin E; D007371:Interferon-gamma / Q000494:pharmacology; D007376:Interleukin-2 / Q000276:immunology; D015847:Interleukin-4 / Q000276:immunology; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000187:drug effects / Q000276:immunology*; D009000:Monocytes / Q000276:immunology; D010835:Phytohemagglutinins; D011961:Receptors, Fc / Q000032:analysis / Q000378:metabolism*; D017455:Receptors, IgE; D012220:Rhinitis / Q000276:immunology*; D012995:Solubility; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000944:Antigens, Differentiation, B-Lymphocyte; D007376:Interleukin-2; D010835:Phytohemagglutinins; D011961:Receptors, Fc; D017455:Receptors, IgE; D015847:Interleukin-4; D007073:Immunoglobulin E; D007371:Interferon-gamma