title: Reversal of experimental autoimmune encephalomyelitis by a soluble peptide variant of a myelin basic protein epitope: T cell receptor antagonism and reduction of interferon gamma and tumor necrosis factor alpha production.
abstract: An immunodominant epitope of myelin basic protein (MBP), VHFFKNIVTPRTP (p87-99), is a major target of T cells in lesions of multiple sclerosis (MS) and in experimental allergic encephalomyelitis (EAE). T cells found in EAE lesions bear the same amino acids in the third complementary determining region of the T cell receptor (TCR) as those found in MS lesions. We analyzed the trimolecular interactions between MBP p87-99, class II major histocompatibility complex (MHC), and TCR, and designed soluble inhibitors for therapy. F, N, I, and V at positions 90, 92, 93, and 94 interact with MHC, whereas K, T, and P at positions 91, 95, and 96 interact with TCR. The peptides, p87-99[95T > A] and p87-99[96P > A] could compete more effectively with p87-99 for binding to MHC and could antagonize the in vitro response to T cells to p87-99 more effectively than p87-99[91K > A]. However, only p87-99[91K > A] prevented and reversed EAE, indicating that the extent of MHC or TCR competition does not predict success in treating EAE. To elucidate the mechanism of inhibition of EAE, draining lymph node cells from rats immunized with the native peptide alone or together with each of the three TCR antagonists were challenged in vitro with p87-99. Administration of p87-99[91K > A], but not p87-99 [95T > A] or p87-99[96P > A], reduced the production of tumor necrosis factor (TNF)- alpha and interferon (IFN) gamma. IFN-gamma and TNF-alpha are two cytokines that are critical in the pathogenesis of EAE and MS.
authors.affiliation: Department of Neurology and Neurological Sciences, Beckman Center for Molecular and Genetic Medicine, Stanford University School of Medicine, California 94305-5239.
authors.forename: N
authors.initials: N
authors.lastname: Karin
authors.forename: D J
authors.initials: DJ
authors.lastname: Mitchell
authors.forename: S
authors.initials: S
authors.lastname: Brocke
authors.forename: N
authors.initials: N
authors.lastname: Ling
authors.forename: L
authors.initials: L
authors.lastname: Steinman
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000941:Antigens / Q000627:therapeutic use*; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology* / Q000628:therapy*; D000939:Epitopes / Q000276:immunology / Q000627:therapeutic use*; D005260:Female; D000949:Histocompatibility Antigens Class II / Q000276:immunology / Q000378:metabolism; D007167:Immunotherapy; D007371:Interferon-gamma / Q000037:antagonists & inhibitors / Q000096:biosynthesis*; D008213:Lymphocyte Activation / Q000187:drug effects; D008969:Molecular Sequence Data; D004676:Myelin Basic Protein / Q000276:immunology / Q000627:therapeutic use*; D010446:Peptide Fragments / Q000138:chemical synthesis / Q000276:immunology / Q000627:therapeutic use*; D051381:Rats; D011917:Rats, Inbred Lew; D011948:Receptors, Antigen, T-Cell / Q000037:antagonists & inhibitors*; D013329:Structure-Activity Relationship; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors / Q000096:biosynthesis*
chemical_list: D000941:Antigens; D000939:Epitopes; D000949:Histocompatibility Antigens Class II; D004676:Myelin Basic Protein; D010446:Peptide Fragments; D011948:Receptors, Antigen, T-Cell; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma