Induction of antigen-specific tolerance to bone marrow allografts with CD4+CD25+ T lymphocytes.

Olivier Joffre (1) , Nathalie Gorsse (1) , Paola Romagnoli (1) , Denis Hudrisier (1, 2) , Joost Pm van Meerwijk (1, 2, 3)

1 CPTP - Centre de Physiopathologie Toulouse Purpan
2 UT3 - Université Toulouse III - Paul Sabatier
3 IUF - Institut universitaire de France

Thymus-derived regulatory T lymphocytes of CD4(+)CD25(+) phenotype regulate a large variety of beneficial and deleterious immune responses and can inhibit lethal graft-versus-host disease in rodents. In vitro, CD4(+)CD25(+) T cells require specific major histocompatibility complex (MHC)/peptide ligands for their activation, but once activated they act in an antigen-nonspecific manner. In vivo, regulatory T cells are also activated in an antigen-specific fashion, but nothing is known about antigen specificity of their suppressor-effector function. Here we show that CD4(+)CD25(+) regulatory T lymphocytes isolated from naive mice and activated in vitro with allogeneic antigen-presenting cells (APCs) induced specific long-term tolerance to bone marrow grafts disparate for major and minor histocompatibility antigens; whereas "target" bone marrow was protected, third-party bone marrow was rejected. Importantly, in mice injected with a mix of target and third-party bone marrows, protection and rejection processes took place simultaneously. These results indicate that CD4(+)CD25(+) regulatory T cells can act in an antigen-specific manner in vivo. Our results suggest that CD4(+)CD25(+) regulatory T cells could in the future be used in clinical settings to induce specific immunosuppression.

Domaines: Immunologie

Olivier Joffre, Nathalie Gorsse, Paola Romagnoli, Denis Hudrisier, Joost Pm van Meerwijk. Induction of antigen-specific tolerance to bone marrow allografts with CD4+CD25+ T lymphocytes.. Blood, 2004, 103 (11), pp.4216-21. ⟨10.1182/blood-2004-01-0005⟩. ⟨inserm-00140919⟩