title: CD27/CD70 interaction contributes to the activation and the function of human autoreactive CD27+ regulatory T cells.
abstract: CD27, a tumor necrosis factor receptor family member, is a constimulatory molecule for T and B cell activation. We demonstrate here that CD27 signaling is critical for T cell activation in the autologous mixed lymphocyte reaction (aMLR) and for aMLR-induced generation of regulatory T cells that suppress pokeweed mitogen-driven immunoglobulin G synthesis by B cells. Moreover, CD27, expressed on CD45RA+ CD4+ T cells, is directly involved in the suppressor function of aMLR-activated CD4+ T cells, probably by interfering with the interaction between CD70, the CD27 ligand, expressed on CD45RO+ CD4+ helper T cells, and CD27, expressed on B cells. CD8+ T cells, which are required in this system to obtain suppression, on the other hand, do not need CD27 engagement to exert their suppressor function.
authors.affiliation: Division of Tumor Immunology, Dana-Farber Cancer Institute, Boston, MA 02115, USA.
authors.forename: S
authors.initials: S
authors.lastname: Jacquot
authors.forename: T
authors.initials: T
authors.lastname: Kobata
authors.forename: S
authors.initials: S
authors.lastname: Iwata
authors.forename: S F
authors.initials: SF
authors.lastname: Schlossman
authors.forename: C
authors.initials: C
authors.lastname: Morimoto
mesh_terms: D015703:Antigens, CD; D053282:CD27 Ligand; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D006801:Humans; D008213:Lymphocyte Activation; D008565:Membrane Proteins / Q000235:genetics / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000235:genetics / Q000276:immunology*
chemical_list: D015703:Antigens, CD; D053282:CD27 Ligand; C505771:CD70 protein, human; D008565:Membrane Proteins; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7