title: Antigen-independent T cell activation mediated by a very late activation antigen-like extracellular matrix receptor.
abstract: Cell-cell and cell-extracellular matrix (ECM) binding mediated by integrin molecules has been implicated in lymphocyte migration and adhesion. We describe here that ECM binding triggers antigen-independent activation of T cell functions. Fibronectin and vitronectin, when coated on plates, not only acted synergistically on anti-CD3-induced serine esterase release in a murine cytotoxic T lymphocyte clone and interleukin 2 production in a murine helper T cell hybridoma but also could trigger these responses alone. All these stimulatory effects of ECM were abrogated by a monoclonal antibody which reacts with a unique very late activation antigen-like integrin and this monoclonal antibody, when coated on plates, exhibited a similar synergistic effect to that of ECM proteins. Therefore, ECM receptors expressed on activated T cells appear to play an important role in triggering T cell effector functions in localized tissues abundant in ECM proteins.
authors.affiliation: Department of Immunology, Juntendo University School of Medicine, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Takahashi
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
authors.forename: H
authors.initials: H
authors.lastname: Adachi
authors.forename: H
authors.initials: H
authors.lastname: Yagita
authors.forename: K
authors.initials: K
authors.lastname: Okumura
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte / Q000502:physiology; D018801:CD2 Antigens; D017252:CD3 Complex; D016326:Extracellular Matrix Proteins / Q000502:physiology*; D005353:Fibronectins / Q000494:pharmacology; D006023:Glycoproteins / Q000494:pharmacology; D006801:Humans; D008213:Lymphocyte Activation; D011948:Receptors, Antigen, T-Cell / Q000502:physiology; D011971:Receptors, Immunologic / Q000502:physiology; D013601:T-Lymphocytes / Q000276:immunology*; D019096:Vitronectin
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D018801:CD2 Antigens; D017252:CD3 Complex; D016326:Extracellular Matrix Proteins; D005353:Fibronectins; D006023:Glycoproteins; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic; D019096:Vitronectin