title: Donor-type CD4(+)CD25(+) regulatory T cells suppress lethal acute graft-versus-host disease after allogeneic bone marrow transplantation.
abstract: Acute graft-versus-host disease (aGVHD) is still a major obstacle in clinical allogeneic bone marrow (BM) transplantation. CD4(+)CD25(+) regulatory T (T(reg)) cells have recently been shown to suppress proliferative responses of CD4(+)CD25(-) T cells to alloantigenic stimulation in vitro and are required for ex vivo tolerization of donor T cells, which results in their reduced potential to induce aGVHD. Here we show that CD4(+)CD25(+) T cells isolated from the spleen or BM of donor C57BL/6 (H-2(b)) mice that have not been tolerized are still potent inhibitors of the alloresponse in vitro and of lethal aGVHD induced by C57BL/6 CD4(+)CD25(-) T cells in irradiated BALB/c (H-2(d)) hosts in vivo. The addition of the CD4(+)CD25(+) T(reg) cells at a 1:1 ratio with responder/inducer CD4(+)CD25(-) T cells resulted in a >90% inhibition of the mixed leukocyte reaction and marked protection from lethal GVHD. This protective effect depended in part on the ability of the transferred CD4(+)CD25(+) T cells to secrete interleukin 10 and occurred if the T(reg) cells were of donor, but not host, origin. Our results demonstrate that the balance of donor-type CD4(+)CD25(+) T(reg) and conventional CD4(+)CD25(-) T cells can determine the outcome of aGVHD.
authors.affiliation: Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, CA 94305, USA.
authors.forename: Petra
authors.initials: P
authors.lastname: Hoffmann
authors.forename: Joerg
authors.initials: J
authors.lastname: Ermann
authors.forename: Matthias
authors.initials: M
authors.lastname: Edinger
authors.forename: C Garrison
authors.initials: CG
authors.lastname: Fathman
authors.forename: Samuel
authors.initials: S
authors.lastname: Strober
mesh_terms: D000208:Acute Disease; D000818:Animals; D016026:Bone Marrow Transplantation / Q000276:immunology*; D015704:CD4 Antigens / Q000032:analysis*; D006086:Graft vs Host Disease / Q000517:prevention & control*; D016753:Interleukin-10 / Q000502:physiology; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D015375:Receptors, Interleukin-2 / Q000032:analysis*; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D014184:Transplantation, Homologous
chemical_list: D015704:CD4 Antigens; D015375:Receptors, Interleukin-2; D016753:Interleukin-10