title: T cell tolerance induced by cross-reactive TCR ligands can be broken by superagonist resulting in anti-inflammatory T cell cytokine production.
abstract: Cross-reactive activation of potentially autoreactive T cells by high-affinity nonself ligands may be important in breaking self-tolerance in autoimmunity. In a mouse transgenic for a cross-reactive TCR, we have previously shown that a hyper-stimulating altered peptide ligand, L144, induced unresponsiveness to the self peptide, proteolipid protein 139-151. In this study, we demonstrate that a superagonist ligand can break T cell tolerance induced by the lower affinity cognate Ag. T cells tolerant to the cognate ligand, Q144, responded to superagonist, L144, by proliferation and the production of mainly IL-4 and IL-10 in vitro. In contrast, T cells that were tolerized to the superagonist were unable to respond to any peptide that cross-reacted with the transgenic TCR. Low-dose immunization with the superagonist L144 was able to break tolerance to the cognate ligand in vivo and resulted in a blunted proliferative response with production of Th2 cytokines.
authors: Center for Neurologic Diseases, Harvard Institute of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
authors: Zsolt
authors: Z
authors: Illés
authors: Hanspeter
authors: H
authors: Waldner
authors: Jayagopala
authors: J
authors: Reddy
authors: Estelle
authors: E
authors: Bettelli
authors: Lindsay B
authors: LB
authors: Nicholson
authors: Vijay K
authors: VK
authors: Kuchroo
mesh_terms: D000818:Animals; D049109:Cell Proliferation; D002478:Cells, Cultured; D017635:Clonal Anergy / Q000235:genetics / Q000276:immunology; D016207:Cytokines / Q000037:antagonists & inhibitors / Q000096:biosynthesis*; D004306:Dose-Response Relationship, Immunologic; D005260:Female; D018836:Inflammation Mediators / Q000037:antagonists & inhibitors / Q000378:metabolism*; D007371:Interferon-gamma / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D007376:Interleukin-2 / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D008024:Ligands; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D010446:Peptide Fragments / Q000008:administration & dosage / Q000276:immunology* / Q000378:metabolism; D011948:Receptors, Antigen, T-Cell / Q000819:agonists* / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism* / Q000637:transplantation
chemical_list: D016207:Cytokines; D018836:Inflammation Mediators; D007376:Interleukin-2; D008024:Ligands; D010446:Peptide Fragments; D011948:Receptors, Antigen, T-Cell; D007371:Interferon-gamma