title: Major histocompatibility complex (MHC) class II restriction, lymphokine production, and IgE regulation of house dust mite-specific T-cell clones.
abstract: To elucidate the regulatory mechanism of human IgE synthesis, we have cloned house dust mite (Dermatophagoides pteronyssinus; Dp)-specific T-cell clones from three asthmatic children and three healthy individuals. Twelve clones were cloned from each group. All of these clones were CD3+, CD4+, CD8-, and HLA-DR+. After stimulation with allergen in the presence of antigen presenting cells (APCs), half of the T-cell clones from asthmatic children and one-third of those from normals produced interleukin 4 (IL-4). None of the patients' clones produced interferon gamma (IFN-gamma), while 10 of 12 normals' clones did. After stimulation with calcium ionophore A23187 and phorbol myristic acetate (PMA), the production of IL-4 was markedly increased in both patients and normals. However, only 3 of the 12 patients' clones produced IFN-gamma, while all of the normals' clones did. The T-cell clones of both patients and normals produced comparable IL-2. To study the kinetics of lymphokine productions, a HLA-DRw12-restricted T-cell clone (FYD 3.1) was stimulated, respectively, with a combination of A23187 and PMA, phytohemagglutinin (PHA), or Dp antigen in the presence of APCs. Maximal IL-2 and IL-4 productions were detected 12 hr after A23187 and PMA stimulation, whereas IFN-gamma could not be detected even 36 hr after stimulation. When stimulated with PHA, the production of IFN-gamma peaked on the fourth day, but IL-4 was not detected. After stimulation with Dp antigen and APCs, IL-4 and IL-2 were detected on the second and third days, but IFN-gamma was not detected. The IgE production by autologous purified B cells in the presence of allergen or IL-4 was found to be augmented by the FYD 3.1 T-cell clones. IFN-gamma was observed to counteract the effects of the T-cell clones and IL-4. Thus, the secretory patterns of lymphokine and kinetics of lymphokine production of allergen-specific T-cell clones can be used to explore the regulatory mechanism of human IgE synthesis [corrected].
authors.affiliation: Graduate Institute of Microbiology and Immunology, National Taiwan University College of Medicine, Republic of China.
authors.forename: K L
authors.initials: KL
authors.lastname: Lin
authors.forename: K H
authors.initials: KH
authors.lastname: Hsieh
authors.forename: J H
authors.initials: JH
authors.lastname: Huang
authors.forename: S Y
authors.initials: SY
authors.lastname: Wang
mesh_terms: D000328:Adult; D000485:Allergens / Q000276:immunology*; D000818:Animals; D039741:Antigens, Dermatophagoides; D001249:Asthma / Q000276:immunology; D002648:Child; D002999:Clone Cells; D000949:Histocompatibility Antigens Class II / Q000096:biosynthesis*; D006801:Humans; D007073:Immunoglobulin E / Q000096:biosynthesis*; D007376:Interleukin-2 / Q000096:biosynthesis; D015847:Interleukin-4 / Q000096:biosynthesis; D008213:Lymphocyte Activation; D008222:Lymphokines / Q000096:biosynthesis*; D008925:Mites / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000485:Allergens; D039741:Antigens, Dermatophagoides; D000949:Histocompatibility Antigens Class II; D007376:Interleukin-2; D008222:Lymphokines; D015847:Interleukin-4; D007073:Immunoglobulin E