Heart/kidney co-transplantation in miniature swine provides the only consistent and reproducible model of nonablative cardiac allograft tolerance in large animals. It also mimics the beneficial effects of co-transplanting hearts and kidneys in humans. The mechanism by which a heart is protected from both acute and chronic rejection by the tolerant state induced by a kidney allograft is unknown. In our previous grant we characterized the role of the donor kidney and host thymus in tolerant heart/kidney recipients and began to investigate kidney-derived cell populations. Based on those studies, we now hypothesize that host thymus-derived regulatory T cells, generated by cells or antigens derived from the donor kidney, are responsible for the induction of tolerance to cardiac allografts in heart/kidney recipients. The corollary is that regulatory T cells are present in tolerant recipients bearing long-term cardiac allografts but are not present in chronically immunosuppressed recipients bearing long-term cardiac allografts. We will test this hypothesis by 1) determining the in vitro characteristics of regulatory T cells from tolerant heart/kidney recipients, 2) determining the role of regulatory T cells in the induction and maintenance phase of tolerance in heart/kidney recipients, 3) determining how a state of tolerance modifies the effects of intragraft cytokine excess in heart/kidney recipients, and 4) comparing the in vitro parameters of transplant immunity in animals bearing allogeneic heart transplants prolonged by tolerance induction vs. chronic immunosuppression. Understanding the mechanisms of T cell regulation may lead to novel tolerance strategies in human transplantation.
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| Hotta, Kiyohiko; Oura, Tetsu; Dehnadi, Abbas et al. (2018) Long-term Nonhuman Primate Renal Allograft Survival Without Ongoing Immunosuppression in Recipients of Delayed Donor Bone Marrow Transplantation. Transplantation 102:e128-e136 |
| Robinson, Kortney A; Orent, William; Madsen, Joren C et al. (2018) Maintaining T cell tolerance of alloantigens: Lessons from animal studies. Am J Transplant 18:1843-1856 |
| Sasaki, Hajime; Oura, Tetsu; Spitzer, Thomas R et al. (2018) Preclinical and clinical studies for transplant tolerance via the mixed chimerism approach. Hum Immunol 79:258-265 |
| Tanimine, Naoki; Turka, Laurence A; Priyadharshini, Bhavana (2018) Navigating T-Cell Immunometabolism in Transplantation. Transplantation 102:230-239 |
| Michel, S G; Madariaga, M L L; LaMuraglia 2nd, G M et al. (2018) The effects of brain death and ischemia on tolerance induction are organ-specific. Am J Transplant 18:1262-1269 |
| Smith, R N; Adam, B A; Rosales, I A et al. (2018) RNA expression profiling of renal allografts in a nonhuman primate identifies variation in NK and endothelial gene expression. Am J Transplant 18:1340-1350 |
| Chatterjee, Debanjana; Moore, Carolina; Gao, Baoshan et al. (2018) Prevalence of polyreactive innate clones among graft--infiltrating B cells in human cardiac allograft vasculopathy. J Heart Lung Transplant 37:385-393 |
| Gonzalez-Nolasco, Bruno; Wang, Mengchuan; Prunevieille, Aurore et al. (2018) Emerging role of exosomes in allorecognition and allograft rejection. Curr Opin Organ Transplant 23:22-27 |
| Smith, R N; Matsunami, M; Adam, B A et al. (2018) RNA expression profiling of nonhuman primate renal allograft rejection identifies tolerance. Am J Transplant 18:1328-1339 |
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