title: Donor bone marrow cells play a role in the prevention of accelerated graft rejection induced by semi-allogeneic spleen cells in transplantation.
abstract: Spleen or spleen plus bone marrow cells from (BALB/cxC57Bl/6)F1 donors were transferred into BALB/c recipients 21 days before skin or cardiac transplantation. Prolonged graft survival was observed on recipients treated with the mixture of donor-derived cells as compared to those treated with spleen cells alone. We evaluated the expression of CD45RB and CD44 by splenic CD4+ and CD8+ T cells 7 and 21 days after donor cell transfer. The populations of CD8+CD45RBlow and CD8+CD44high cells were significantly decreased in mice pre-treated with donor spleen and bone marrow cells as compared to animals treated with spleen cells only, although these cells expanded in both groups when compared to an earlier time-point. No differences were observed regarding CD4+ T cell population when recipients of donor-derived cells were compared. An enhanced production of IL-10 was observed seven days after transplantation in the supernatants of spleen cell cultures of mice treated with spleen and bone marrow cells. Taken together these data suggest that donor-derived bone marrow cells modulate the sensitization of the recipient by semi-allogeneic spleen cells in part by delaying the generation of activated/memory CD8+ T cells leading to enhanced graft survival.
authors.affiliation: Laboratory of Clinical Immunology, Department of Immunology, Institute of Biomedical Sciences, University of São Paulo, SP, Brazil. luveira@usp.br
authors.forename: Luciana V
authors.initials: LV
authors.lastname: de Moraes
authors.forename: Valquiria
authors.initials: V
authors.lastname: Bueno
authors.forename: Ivo
authors.initials: I
authors.lastname: Marguti
authors.forename: Gislâine A
authors.initials: GA
authors.lastname: Martins
authors.forename: Adriana L
authors.initials: AL
authors.lastname: Vallochi
authors.forename: Guilherme L
authors.initials: GL
authors.lastname: Yamamoto
authors.forename: Nicolas
authors.initials: N
authors.lastname: Panajotopoulos
authors.forename: José O
authors.initials: JO
authors.lastname: Mengel
authors.forename: Luiz V
authors.initials: LV
authors.lastname: Rizzo
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000276:immunology*; D016026:Bone Marrow Transplantation / Q000276:immunology*; D005260:Female; D006084:Graft Rejection / Q000276:immunology* / Q000517:prevention & control; D006085:Graft Survival / Q000276:immunology; D016027:Heart Transplantation / Q000276:immunology*; D007519:Isoantigens / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D016038:Skin Transplantation / Q000276:immunology*; D013154:Spleen / Q000166:cytology* / Q000276:immunology / Q000378:metabolism; D014184:Transplantation, Homologous
chemical_list: D007519:Isoantigens