title: Down-regulation of antigen-specific antibody production by TCR antagonist peptides in vivo.
abstract: The efficacy of TCR antagonist peptides in inhibition of antigen-specific antibody production and T cell responses in vivo was evaluated. Among amino acid-substituted analogs of a peptide corresponding to residues 119 - 133 of bovine beta-lactoglobulin (p119 - 133), pR124Q and pD129S, prepared by substitution of Gln and Ser for Arg(124) and Asp(129), respectively, have been shown to display TCR antagonist activity for three out of four distinct p119 - 133-specific T cell clones and for polyclonal T cells derived from p119 - 133-immunized C57BL / 6 mice. Both pD129S and pR124Q inhibited in vivo priming and subsequent activation of T cells by p119 - 133 when co-injected with p119 - 133 into mice, as shown by the decreased proliferation of T cells in response to p119-133 in vitro. pD129S significantly inhibited production of anti-p119 - 113 antibodies of IgG1, IgG2b and IgE isotype in vivo when co-injected into mice together with p119 - 133 at the time of the first immunization. However, pR124Q was totally ineffective in inhibition of the antibody responses. Anti-p119 - 133 antibodies from p119 - 133-immunized mice could bind to pR124Q but not to pD129S, suggesting that the difference in cross-reactivity is responsible for the different effect of these two peptides on specific antibody production. Our findings demonstrate that a single TCR antagonist peptide can inhibit antigen-specific polyclonal antibody production when this antagonist peptide does not cross-react with the antibody elicited in response to an antigenic peptide.
authors.affiliation: Department of Applied Biological Chemistry, The University of Tokyo, Tokyo, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Toda
authors.forename: M
authors.initials: M
authors.lastname: Totsuka
authors.forename: S
authors.initials: S
authors.lastname: Furukawa
authors.forename: K
authors.initials: K
authors.lastname: Yokota
authors.forename: T
authors.initials: T
authors.lastname: Yoshioka
authors.forename: A
authors.initials: A
authors.lastname: Ametani
authors.forename: S
authors.initials: S
authors.lastname: Kaminogawa
mesh_terms: D000818:Animals; D000917:Antibody Formation / Q000276:immunology*; D017951:Antigen Presentation / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology; D002417:Cattle; D008211:Lymphocyte Cooperation / Q000276:immunology; D051379:Mice; D010455:Peptides / Q000276:immunology / Q000494:pharmacology; D011948:Receptors, Antigen, T-Cell / Q000037:antagonists & inhibitors* / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D010455:Peptides; D011948:Receptors, Antigen, T-Cell