title: Interaction of disease-related antigen-reactive T-cell lines from multiple sclerosis patients with type IV collagen: role of integrin VLA-1 and effects of irradiation.
abstract: Multiple sclerosis (MS), a chronic demyelinating disease, is thought to be initiated by pathogenic T cells that transmigrate the vascular endothelium and enter the brain through vascular and parenchymal basement membranes (BM). Vaccination with T-cell lines reactive with myelin basic protein (MBP) and myelin oligodendrocytic glycoprotein (MOG) epitopes, expanded with interleukin-2 (IL-2), and attenuated by ionizing radiation is currently being evaluated as a therapeutic modality for this disease. We examined mechanisms potentially involved in pathogenic cell migration into the central nervous system (CNS) and the influence of irradiation on these processes. Seven of 7 autoantigen-responsive T-cell lines from MS patients adhered to collagen IV, the major collagenous constituent of BMs. This adhesion was inhibited almost completely by monoclonal antibody (MAb) to very late antigen (VLA)-1 and partially by anti-VLA-2. T-cell lines from healthy donors adhered more variably to collagen IV. Furthermore, patient derived T cells actively transmigrated through a collagen IV gel toward medium containing TNF-a, in a process that was inhibited by MAbs to VLA-1. Ionizing radiation at the dose used in vaccine preparation, inhibited morphological polarization associated with migratory capability, induced integrin clustering on the cell membrane, and abrogated adhesion to collagen IV. These findings may have important implications for understanding the pathogenesis of MS and how irradiation of potentially pathogenic T cells produces a reagent with possible therapeutic effects in T-cell vaccination (TCV).
authors.affiliation: Department of Medicine F, Sheba Medical Center and Tel Aviv University, Tel Hashomer, Israel. ibank@post.tau.ac.il
authors.forename: Ilan
authors.initials: I
authors.lastname: Bank
authors.forename: Anat
authors.initials: A
authors.lastname: Achiron
authors.forename: Gad
authors.initials: G
authors.lastname: Levie
authors.forename: Alexander
authors.initials: A
authors.lastname: Koltakov
authors.forename: Mathilda
authors.initials: M
authors.lastname: Mandel
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D002448:Cell Adhesion / Q000528:radiation effects; D002634:Chemotaxis, Leukocyte / Q000528:radiation effects; D024141:Collagen Type IV / Q000378:metabolism*; D006801:Humans; D039222:Integrin alpha1beta1 / Q000276:immunology / Q000378:metabolism; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000276:immunology* / Q000628:therapy; D004676:Myelin Basic Protein / Q000276:immunology; D009185:Myelin Proteins; D018992:Myelin-Associated Glycoprotein / Q000276:immunology; D063308:Myelin-Oligodendrocyte Glycoprotein; D011830:Radiation Effects; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism / Q000473:pathology* / Q000528:radiation effects*; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology; D014613:Vaccines, Attenuated
chemical_list: D024141:Collagen Type IV; D039222:Integrin alpha1beta1; C571326:MOG protein, human; D004676:Myelin Basic Protein; D009185:Myelin Proteins; D018992:Myelin-Associated Glycoprotein; D063308:Myelin-Oligodendrocyte Glycoprotein; D011948:Receptors, Antigen, T-Cell; D014409:Tumor Necrosis Factor-alpha; D014613:Vaccines, Attenuated