title: CD4+CD25+ regulatory/suppressor T cells prevent allogeneic fetus rejection in mice.
abstract: Recent evidences indicate that naturally occurring CD4+CD25+ regulatory/suppressor T cells (T(reg)) regulate not only autoimmunity, but also alloreactivity. In mice, they notably control tolerance to allogeneic transplants and graft-versus-host disease after allogeneic hematopoietic stem cell transplantation. Here, we studied the role of T(reg) in maternal tolerance to fetuses, i.e. natural semi-allogeneic grafts. We show that semi-allogeneic pregnancies in mice induce an expansion of T(reg), but not of activated CD4+ and CD8+ T cells, in para-aortic lymph nodes draining fetal antigens. The treatment of female mice with an anti-CD25 antibody before mating results in depletion of T(reg) and expansion of activated CD4+ and CD8+ T cells solely in the draining lymph nodes, ultimately leading to fetus rejection. These observations were not made in the context of syngeneic pregnancies. Thus, T(reg) play a major role in maternal-fetal tolerance.
authors.affiliation: Biologie et Thérapeutique des Pathologies Immunitaires, UPMC/CNRS UMR 7087, Assistance Publique-Hôpitaux de Paris, Hôpital Pitié-Salpêtrière, 83 boulevard de l'Hôpital, F75651 Paris Cedex 13, France.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Darrasse-Jèze
authors.forename: Guillaume
authors.initials: G
authors.lastname: Darasse-Jèze
authors.forename: David
authors.initials: D
authors.lastname: Klatzmann
authors.forename: Frédéric
authors.initials: F
authors.lastname: Charlotte
authors.forename: Benoît L
authors.initials: BL
authors.lastname: Salomon
authors.forename: José L
authors.initials: JL
authors.lastname: Cohen
mesh_terms: D000818:Animals; D020964:Embryo Loss / Q000276:immunology* / Q000517:prevention & control*; D005260:Female; D008198:Lymph Nodes / Q000276:immunology; D008297:Male; D051379:Mice; D011247:Pregnancy; D015375:Receptors, Interleukin-2 / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D015375:Receptors, Interleukin-2