title: CD40 and IFN-gamma dependent T cell activation by human bronchial epithelial cells.
abstract: We examined whether freshly isolated human bronchial cells (HBEC) and bronchial epithelial cell line/BEAS-2B cells expressed surface molecules required for APC function. These cells expressed CD40 and ICAM-1, but not B7-1, B7-2 or HLA-DR molecules. Treatment of these cells with IFN-gamma resulted in enhanced expression of CD40 and ICAM-1 as well as induction of HLA-DR expression. Th2 cytokines such as IL-4 and IL-5, proinflammatory cytokine of GM-CSF and nonspecific activator endotoxin had no effect on these phenotypic expressions. Functional examinations showed that allogeneic lymphocytes purified from peripheral blood strongly proliferated in response to BEAS-2B cells cultured with IFN-gamma, but only weakly compared with those without IFN-gamma. When allogeneic lymphocytes were purified to CD4+ cells, the proliferative response against BEAS-2B cells was abolished. Blockade of CD40-CD40L interaction by anti-CD40 antibody also inhibited the proliferation of lymphocytes to BEAS-2B cells, although this treatment showed a minimum effect on the response to allogeneic MNC. Thus, bronchial epithelial cells have the ability to present allogeneic antigens to T cells in both CD40- and IFN-gamma-dependent manners under the presence of third party cells that transduce co-stimulatory signals.
authors: Third Department of Internal Medicine, University of Tokushima School of Medicine, Japan.
authors: H
authors: H
authors: Tanaka
authors: K
authors: K
authors: Maeda
authors: Y
authors: Y
authors: Nakamura
authors: M
authors: M
authors: Azuma
authors: H
authors: H
authors: Yanagawa
authors: S
authors: S
authors: Sone
mesh_terms: D000911:Antibodies, Monoclonal / Q000378:metabolism; D015703:Antigens, CD / Q000096:biosynthesis; D018122:B7-1 Antigen / Q000096:biosynthesis; D051940:B7-2 Antigen; D001980:Bronchi / Q000276:immunology*; D019013:CD40 Antigens / Q000096:biosynthesis*; D002455:Cell Division; D002461:Cell Line, Transformed; D004847:Epithelial Cells / Q000166:cytology / Q000187:drug effects / Q000276:immunology; D006684:HLA-DR Antigens / Q000096:biosynthesis; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000096:biosynthesis; D007371:Interferon-gamma / Q000378:metabolism* / Q000494:pharmacology; D008213:Lymphocyte Activation / Q000276:immunology*; D008562:Membrane Glycoproteins / Q000096:biosynthesis; D011994:Recombinant Proteins; D020545:Respiratory Mucosa / Q000166:cytology / Q000276:immunology; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; D019013:CD40 Antigens; C497964:CD86 protein, human; D006684:HLA-DR Antigens; D008562:Membrane Glycoproteins; D011994:Recombinant Proteins; D018799:Intercellular Adhesion Molecule-1; D007371:Interferon-gamma