Prevention of acute and chronic allograft rejection with CD4+CD25+Foxp3+ regulatory T lymphocytes

O Joffre, T Santolaria, D Calise, TA Saati, D Hudrisier… - Nature medicine, 2008 - nature.com
O Joffre, T Santolaria, D Calise, TA Saati, D Hudrisier, P Romagnoli, JP Van Meerwijk
Nature medicine, 2008nature.com
A major challenge in transplantation medicine is controlling the very strong immune
responses to foreign antigens that are responsible for graft rejection. Although
immunosuppressive drugs efficiently inhibit acute graft rejection, a substantial proportion of
patients suffer chronic rejection that ultimately leads to functional loss of the graft. Induction
of immunological tolerance to transplants would avoid rejection and the need for lifelong
treatment with immunosuppressive drugs,. Tolerance to self-antigens is ensured naturally by …
Abstract
A major challenge in transplantation medicine is controlling the very strong immune responses to foreign antigens that are responsible for graft rejection. Although immunosuppressive drugs efficiently inhibit acute graft rejection, a substantial proportion of patients suffer chronic rejection that ultimately leads to functional loss of the graft. Induction of immunological tolerance to transplants would avoid rejection and the need for lifelong treatment with immunosuppressive drugs,. Tolerance to self-antigens is ensured naturally by several mechanisms; one major mechanism depends on the activity of regulatory T lymphocytes,. Here we show that in mice treated with clinically acceptable levels of irradiation, regulatory CD4+CD25+Foxp3+ T cells stimulated in vitro with alloantigens induced long-term tolerance to bone marrow and subsequent skin and cardiac allografts. Regulatory T cells specific for directly presented donor antigens prevented only acute rejection, despite hematopoietic chimerism. By contrast, regulatory T cells specific for both directly and indirectly presented alloantigens prevented both acute and chronic rejection. Our findings demonstrate the potential of appropriately stimulated regulatory T cells for future cell-based therapeutic approaches to induce lifelong immunological tolerance to allogeneic transplants.
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