title: Regulatory CD4(+) T cells expressing endogenous T cell receptor chains protect myelin basic protein-specific transgenic mice from spontaneous autoimmune encephalomyelitis.
abstract: The development of T cell-mediated autoimmune diseases hinges on the balance between effector and regulatory mechanisms. Using two transgenic mouse lines expressing identical myelin basic protein (MBP)-specific T cell receptor (TCR) genes, we have previously shown that mice bearing exclusively MBP-specific T cells (designated T/R-) spontaneously develop experimental autoimmune encephalomyelitis (EAE), whereas mice bearing MBP-specific T cells as well as other lymphocytes (designated T/R+) did not. Here we demonstrate that T/R- mice can be protected from EAE by the early transfer of total splenocytes or purified CD4(+) T cells from normal donors. Moreover, whereas T/R+ mice crossed with B cell-deficient, gamma/delta T cell-deficient, or major histocompatibility complex class I-deficient mice did not develop EAE spontaneously, T/R+ mice crossed with TCR-alpha and -beta knockout mice developed EAE with the same incidence and severity as T/R- mice. In addition, MBP-specific transgenic mice that lack only endogenous TCR-alpha chains developed EAE with high incidence but reduced severity. Surprisingly, two-thirds of MBP-specific transgenic mice lacking only endogenous TCR-beta chains also developed EAE, suggesting that in T/R+ mice, cells with high protective activity escape TCR-beta chain allelic exclusion. Our study identifies CD4(+) T cells bearing endogenous alpha and beta TCR chains as the lymphocytes that prevent spontaneous EAE in T/R+ mice.
authors.affiliation: Division of Molecular Pathogenesis, Skirball Institute of Biomolecular Medicine, and the Department of Pathology, New York, New York 10016, USA.
authors.forename: D
authors.initials: D
authors.lastname: Olivares-Villagómez
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: J J
authors.initials: JJ
authors.lastname: Lafaille
mesh_terms: D000818:Animals; D001327:Autoimmune Diseases / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D003433:Crosses, Genetic; D004195:Disease Models, Animal; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000235:genetics* / Q000276:immunology; D015847:Interleukin-4 / Q000235:genetics / Q000276:immunology; D051379:Mice; D008822:Mice, Transgenic; D004676:Myelin Basic Protein / Q000276:immunology*; D011948:Receptors, Antigen, T-Cell / Q000235:genetics / Q000276:immunology*; D013154:Spleen / Q000276:immunology
chemical_list: D004676:Myelin Basic Protein; D011948:Receptors, Antigen, T-Cell; D015847:Interleukin-4