title: Expression and functions of very late antigen 1 in inflammatory joint diseases.
abstract: In the human immune system, very late antigen 1 (VLA-1), a putative collagen receptor, is expressed on the surface of T lymphocytes that have undergone mitogenic or antigenic stimulation. A new VLA-1-specific monoclonal antibody, 1B3.1, was used to probe the expression and function of VLA-1 on T lymphocytes in patients with arthritis. Synovial mononuclear cells from the joints of patients with rheumatoid arthritis or other joint diseases contained 32.9 +/- 13.8% 1B3.1-positive cells (42.8 +/- 10.4% in patients with rheumatoid arthritis and 28 +/- 12.6% in non rheumatoid patients). In the peripheral blood, patients with active rheumatoid arthritis expressed VLA-1 on 11.7 +/- 6.0% of their mononuclear cells, compared to 1.9 +/- 1.5% in controls (P less than 0.001). Using dual fluorescence analysis, virtually all the 1B3.1-positive synovial cells were CD3+ T lymphocytes and included both CD4+ and CD8+ T cells. When 1B3.1-expressing synovial mononuclear cells or in vitro activated T lymphocytes were triggered with anti-CD3 antibodies, marked augmentation of their proliferation occurred if they were simultaneously cross-linked with mab 1B3.1. Collagen type IV, a putative ligand of VLA-1, also augmented T-cell proliferation to anti-CD3. The data suggest that the VLA-1 molecule could play an important role in the pathophysiology of arthritis by modulating T-cell activation in these diseases.
authors.affiliation: Department of Medicine, Chaim Sheba Medical Center, Tel Hashomer, Israel.
authors.forename: I
authors.initials: I
authors.lastname: Bank
authors.forename: D
authors.initials: D
authors.lastname: Roth
authors.forename: M
authors.initials: M
authors.lastname: Book
authors.forename: A
authors.initials: A
authors.lastname: Guterman
authors.forename: I
authors.initials: I
authors.lastname: Shnirrer
authors.forename: R
authors.initials: R
authors.lastname: Block
authors.forename: M
authors.initials: M
authors.lastname: Ehrenfeld
authors.forename: P
authors.initials: P
authors.lastname: Langevitz
authors.forename: H
authors.initials: H
authors.lastname: Brenner
authors.forename: M
authors.initials: M
authors.lastname: Pras
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D017252:CD3 Complex; D015704:CD4 Antigens / Q000276:immunology; D016827:CD8 Antigens; D005455:Fluorescent Antibody Technique; D006801:Humans; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D016029:Receptors, Very Late Antigen / Q000276:immunology / Q000378:metabolism*; D013582:Synovial Fluid / Q000166:cytology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D015704:CD4 Antigens; D016827:CD8 Antigens; D011948:Receptors, Antigen, T-Cell; D016029:Receptors, Very Late Antigen