The role of the very late antigen-4 and its counterligand vascular cell adhesion molecule-1 in the pathogenesis of experimental autoimmune neuritis of the Lewis rat.
We have investigated the functional role of very late antigen-4 [VLA-4 (alpha4/beta1) integrin] and vascular cell adhesion molecule-1 (VCAM-1) in experimental autoimmune neuritis (EAN), an animal model of the Guillain-Barré syndrome, using neutralizing monoclonal antibodies (mAbs) as probes. Disease was induced by intravenous adoptive transfer of P2 specific T cells (AT-EAN), or by immunization with bovine myelin (active EAN). Preventive treatment with 500 microg anti-VLA-4 mAb (TA-2) or with an isotype control antibody was given in AT-EAN 4 h before cell transfer and at day 3. Intravenous injection of 500 microg anti-VCAM-1 mAb (5F10) or a corresponding isotype control was given in AT-EAN 4 h before disease induction, and at days 2, 4 and 6. Preventive treatment of active EAN with mAb to VLA-4 or VCAM-1 was performed at days 5, 9 and 13. On immunohistochemical examination, VCAM-1 in sciatic nerve was found to be upregulated at early stages of EAN (days 3-5 after T-cell transfer), whilst no expression was noted in healthy controls. In both EAN models, blockade of VLA-4 markedly attenuated disease severity. Blockade of VCAM-1 also significantly ameliorated the disease course and diminished T-cell infiltration in sciatic nerve, but to a lesser degree. These experiments demonstrate the critical role of VLA-4 in the pathogenesis of EAN and show that upregulation of VCAM-1 expression contributes, at least in part, to the progression of the disease in the early stages. Future studies are needed to assess the potential contribution of other VLA-4 ligands.
Department of Neurology, Julius-Maximilians Universität, Würzburg, Germany.
U
U
Enders
R
R
Lobb
R B
RB
Pepinsky
H P
HP
Hartung
K V
KV
Toyka
R
R
Gold
D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D001327:Autoimmune Diseases / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D002417:Cattle; D005260:Female; D039041:Integrin alpha4beta1; D016023:Integrins / Q000276:immunology* / Q000378:metabolism; D009443:Neuritis / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D051381:Rats; D011917:Rats, Inbred Lew; D016201:Receptors, Lymphocyte Homing / Q000276:immunology* / Q000378:metabolism; D019010:Vascular Cell Adhesion Molecule-1 / Q000276:immunology* / Q000378:metabolism
D000911:Antibodies, Monoclonal; D039041:Integrin alpha4beta1; D016023:Integrins; D016201:Receptors, Lymphocyte Homing; D019010:Vascular Cell Adhesion Molecule-1