title: Vasoactive intestinal peptide generates CD4+CD25+ regulatory T cells in vivo.
abstract: CD4+CD25+ regulatory T (Treg) cells control the immune response to a variety of antigens, including self-antigens, and several models support the idea of the peripheral expansion of CD4+CD25+ Treg cells. Although hormones such as estrogen and alpha-melanocyte-stimulating hormone have been recently reported to expand the CD4+CD25+ Foxp3-expressing Treg cell compartment, little is known about the endogenous factors and mechanisms controlling the peripheral expansion of CD4+CD25+ Treg cells. In this study, we report on the capacity of the vasoactive intestinal peptide (VIP), an immunosuppressive neuropeptide, to induce functional Treg cells in vivo. The administration of VIP together with specific antigen to T cell receptor (TCR)-transgenic (Tg) mice results in the expansion of the CD4+CD25+, Foxp-3/neuropilin 1-expressing T cells, which inhibit responder T cell proliferation through direct cellular contact. In addition to the increase in the number of CD4+CD25+ Treg cells, VIP induces more efficient suppressors on a per-cell basis. The VIP-generated CD4+CD25+ Treg cells transfer suppression, inhibit delayed-type hypersensitivity in TCR-Tg hosts, and prevent graft-versus-host disease in irradiated hosts reconstituted with allogeneic bone marrow.
authors.affiliation: Department of Biological Sciences, Rutgers University, Newark, NJ 07102, USA.
authors.forename: Mario
authors.initials: M
authors.lastname: Delgado
authors.forename: Alejo
authors.initials: A
authors.lastname: Chorny
authors.forename: Elena
authors.initials: E
authors.lastname: Gonzalez-Rey
authors.forename: Doina
authors.initials: D
authors.lastname: Ganea
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology*; D002450:Cell Communication / Q000276:immunology; D049109:Cell Proliferation / Q000187:drug effects; D051858:Forkhead Transcription Factors / Q000276:immunology; D006086:Graft vs Host Disease / Q000276:immunology; D006968:Hypersensitivity, Delayed / Q000235:genetics / Q000276:immunology; D007108:Immune Tolerance / Q000187:drug effects / Q000276:immunology*; D007111:Immunity, Cellular / Q000187:drug effects / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D011948:Receptors, Antigen, T-Cell / Q000235:genetics / Q000276:immunology; D015375:Receptors, Interleukin-2 / Q000276:immunology*; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000187:drug effects / Q000276:immunology*; D014184:Transplantation, Homologous; D014660:Vasoactive Intestinal Peptide / Q000276:immunology* / Q000494:pharmacology
chemical_list: D051858:Forkhead Transcription Factors; C498833:Foxp3 protein, mouse; D011948:Receptors, Antigen, T-Cell; D015375:Receptors, Interleukin-2; D014660:Vasoactive Intestinal Peptide