title: Allergen-specific human IgE helper T cell lines derived from patients allergic to Japanese cedar pollen.
abstract: To study the regulatory mechanism of allergen-dependent human IgE synthesis, Cry j I-specific and interleukin 4 (IL-4)-producing CD4+ T cell lines (SN-4 and SS-12) were established from 2 patients allergic to Japanese cedar pollen who highly expressed IL-4 mRNA in T cells in response to Cry j I stimulation. Upon stimulation of SN-4 and SS-12 cells with Cry j I, IL-4 production, which was observed at the protein and the mRNA levels, was induced in an HLA-DR-restricted manner, using autologous and allogeneic antigen-presenting cells. In addition to IL-4, not only considerable amounts of IL-5 and IL-6 but also very small amounts of IL-2 and interferon-gamma (IFN-gamma) were secreted by SN-4 and SS-12 cells, indicating that they fit into the Th2-like phenotype. The culture supernatant from Cry j I-activated SN-4 cells had the ability to induce IL-4-dependent IgE synthesis, CD23 expression and soluble CD23 release. Moreover, Cry j I-dependent IgE synthesis medated by SN-4 cells derived from 1 patient expressing HLA-DRw8, w9 could be specifically induced in both autologous and HLA-DRw9-matched allogeneic B cell cultures. This IgE induction was inhibited by neutralizing antibodies to IL-4, IL-5 and IL-6, but was not enhanced by anti-IFN-gamma antibody. On the other hand, neither IL-4 production nor IgE synthesis was induced when SN-4 cells were cocultured in the presence of Cry j I with HLA-DRw8-matched or histoincompatible allogeneic cells.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Clinical Research Center for Allergy, National Sagamihara Hospital, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Yanagihara
authors.forename: M
authors.initials: M
authors.lastname: Kiniwa
authors.forename: T
authors.initials: T
authors.lastname: Koshio
authors.forename: K
authors.initials: K
authors.lastname: Kajiwara
authors.forename: H
authors.initials: H
authors.lastname: Yasueda
authors.forename: K
authors.initials: K
authors.lastname: Ikizawa
mesh_terms: D000328:Adult; D000485:Allergens / Q000276:immunology*; D052179:Antigens, Plant; D001402:B-Lymphocytes / Q000276:immunology; D001483:Base Sequence; D015152:Blotting, Northern; D002460:Cell Line / Q000276:immunology*; D016207:Cytokines / Q000096:biosynthesis; D005260:Female; D006801:Humans; D007073:Immunoglobulin E / Q000096:biosynthesis / Q000276:immunology*; D008213:Lymphocyte Activation; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000276:immunology*; D011058:Pollen / Q000276:immunology; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000032:analysis; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*
chemical_list: D000485:Allergens; D052179:Antigens, Plant; C065290:Cry j I protein, Cryptomeria japonica; D016207:Cytokines; D010940:Plant Proteins; D012333:RNA, Messenger; D007073:Immunoglobulin E