title: CD28:B7 interaction is necessary for the protective effect of T cell vaccination in EAE.
abstract: The mechanisms of T cell vaccination (TCV) are still unclear, especially the molecular interactions for recognition of autoreactive T cells by the immune system. Here we investigated the role of CD28:B7 interaction in TCV-induced protection in the murine EAE model. We demonstrate that there is increased expression of both B7-1 and B7-2 on autoreactive Th1 cells compared to Th2 cells. Blockade of B7 on the vaccinating autoreactive T cell surface or blockade of CD28 in recipient mice reduced the protective effect of TCV. Furthermore, we showed that TCV significantly inhibited Ag-specific CD4 and CD8 T cell proliferation and decreased Ag-specific IFN-gamma production by CD4 T cells in mice undergoing TCV, and blocking of B7 on the surface of vaccinating T cells reduced this inhibition on Ag-specific CD4 and CD8 T cell proliferation, more significantly on Ag-specific CD4 T cell proliferation. These data indicated that B7 expression on autoreactive T cells is necessary for the recognition of autoreactive T cells by the immune system and subsequent protection from EAE in mice undergoing TCV.
authors.affiliation: Department of Neurology, The Ohio State University Medical Center, Columbus, OH 43210, USA.
authors.forename: Yuhong
authors.initials: Y
authors.lastname: Yang
authors.forename: Robert B
authors.initials: RB
authors.lastname: Ratts
authors.forename: Rehana Z
authors.initials: RZ
authors.lastname: Hussain
authors.forename: Sara C
authors.initials: SC
authors.lastname: Northrop
authors.forename: Li-Hong
authors.initials: LH
authors.lastname: Ben
authors.forename: Amy
authors.initials: A
authors.lastname: Lovett-Racke
authors.forename: Michael K
authors.initials: MK
authors.lastname: Racke
mesh_terms: D000818:Animals; D015551:Autoimmunity; D018122:B7-1 Antigen / Q000276:immunology* / Q000378:metabolism; D018106:CD28 Antigens / Q000276:immunology* / Q000378:metabolism; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology / Q000517:prevention & control*; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D051379:Mice; D008822:Mice, Transgenic; D018417:Th1 Cells / Q000276:immunology* / Q000637:transplantation; D018418:Th2 Cells / Q000276:immunology* / Q000637:transplantation; D014611:Vaccination
chemical_list: D018122:B7-1 Antigen; D018106:CD28 Antigens