title: Regulation of CD23 expression by IL-4 and corticosteroid in human B lymphocytes. Altered response after EBV infection.
abstract: Cellular CD23 has been implicated in various biologic and pathologic processes. Here, we have studied the regulation of B cell CD23 expression and function by the synthetic corticosteroid, dexamethasone (DEX). We report that DEX acts directly on B lymphocytes to down-regulate IL-4-induced CD23 expression, whereas in parallel the IL-4R is up-regulated. Down-regulation of CD23 occurred at the cell surface and for shed material in culture medium. EBV infection of B cells is linked to development of lymphoproliferative diseases, including lymphoma, and there is evidence that EBV-stimulated CD23 expression may be instrumental in the inappropriate survival of infected cells. We have determined that treatment of EBV-infected cells with IL-4 leads to a synergistic up-regulation of B cell CD23. Furthermore, infection of B cells by EBV introduced a relative resistance to the down-regulatory effects of DEX on IL-4-induced CD23 expression.
authors.affiliation: Department of Pediatrics, National Jewish Center for Immunology and Respiratory Medicine, Denver, CO 80206.
authors.forename: R L
authors.initials: RL
authors.lastname: Paterson
authors.forename: R
authors.initials: R
authors.lastname: Or
authors.forename: J M
authors.initials: JM
authors.lastname: Domenico
authors.forename: G
authors.initials: G
authors.lastname: Delespesse
authors.forename: E W
authors.initials: EW
authors.lastname: Gelfand
mesh_terms: D001402:B-Lymphocytes / Q000187:drug effects / Q000276:immunology* / Q000382:microbiology; D003907:Dexamethasone / Q000494:pharmacology; D015536:Down-Regulation; D006566:Herpesviridae Infections / Q000276:immunology; D004854:Herpesvirus 4, Human / Q000276:immunology*; D006801:Humans; D066298:In Vitro Techniques; D015847:Interleukin-4 / Q000494:pharmacology; D017455:Receptors, IgE / Q000378:metabolism*; D014412:Tumor Virus Infections / Q000276:immunology; D015854:Up-Regulation
chemical_list: D017455:Receptors, IgE; D015847:Interleukin-4; D003907:Dexamethasone