title: Affinity-purified soluble Fc epsilon RII/CD23 derived from RPMI-8866 cells induces histamine release from human nasal polyp mast cells through a non-IgE-mediated mechanism.
abstract: Soluble Fc epsilon RII/CD23 (IgE-binding factor) is released spontaneously from activated B cells and most EBV-immortalised B cell lines. We have purified soluble Fc epsilon RII/CD23 from culture supernatants of RPMI-8866 cells on an IgE Sepharose column, and studied its ability to release histamine from human nasal polyp mast cells. Soluble Fc epsilon RII/CD23 induces release of a significant amount of histamine from nasal polyp mast cells in a dose-dependent manner. IgE, and a monoclonal antibody specific for the soluble form of this receptor, were shown to neutralise this effect. It was found that soluble Fc epsilon RII/CD23 was still capable of triggering histamine release from nasal polyp mast cells from which IgE had been eluted by incubation in a low pH buffer, suggesting that a non-IgE mediated mechanism was responsible for this effect.
authors.affiliation: Department of Immunology, University of Birmingham, U.K.
authors.forename: A A
authors.initials: AA
authors.lastname: Ghaderi
authors.forename: V M
authors.initials: VM
authors.lastname: Jones
authors.forename: D R
authors.initials: DR
authors.lastname: Stanworth
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D015703:Antigens, CD / Q000276:immunology*; D000944:Antigens, Differentiation, B-Lymphocyte / Q000276:immunology* / Q000302:isolation & purification; D002460:Cell Line; D002846:Chromatography, Affinity; D006636:Histamine Release / Q000276:immunology*; D006801:Humans; D007073:Immunoglobulin E / Q000276:immunology*; D008168:Lung / Q000276:immunology; D008297:Male; D008407:Mast Cells / Q000276:immunology*; D009298:Nasal Polyps / Q000276:immunology*; D051381:Rats; D011919:Rats, Inbred Strains; D011961:Receptors, Fc / Q000276:immunology* / Q000302:isolation & purification; D017455:Receptors, IgE
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D000944:Antigens, Differentiation, B-Lymphocyte; D011961:Receptors, Fc; D017455:Receptors, IgE; D007073:Immunoglobulin E