Project Overview Transplantation tolerance Is a dynamic immunological state that accommodates graft acceptance whilst maintaining undiminished immune responses to pathogens. We have recently demonstrated that the induction and preservation of transplantation tolerance can be differentially Impacted by pathogens that elicit distinct innate and adaptive immune signatures. These and other recent observations from our laboratories have led us to hypothesize that the quality of the tolerant state, either at the time of induction or during the maintenance phase, and the type of infection determine the long-term fate of the allograft. This is a new application requesting support for a highly integrated program project focused on understanding the cellular mechanisms in T cells that are necessary for a robust and persistent state of transplantation tolerance (i.e., tolerance that resists reversal by infections and permits long-term preservation of allograft function) (Project 1; Alegre) and understanding the short-term and long-term effects of infections on an already established state of transplantation tolerance (Project 2; Chong). Two Cores support the work of the two projects in the program. The Administrative Core (Core A, Chong) will oversee the administration of the program including the coordination of Progress Reports and co-ordinate meetings with the Internal and External Advisory Boards. The Animal and Microsurgery Core (Core B, Alegre) will be responsible for animal breeding and heart transplantations necessary for the two scientific projects. The Alegre and Chong laboratories have already been functioning as an integrated, cooperative program. Our investigations are revealing the complexity of the tolerant state as well as an unexpectedly divergent impact of infections on tolerance. There are few existing paradigms to guide these studies, thus the formal infrastructure of a Program Project will allow us to more seamlessly share personnel, data, resources, and to generate new hypotheses. Interactions with the internal and external advisory board members will allow new hypotheses and research designs to be vigorously vetted and improved upon. Successful completion of this program project will result in novel mechanistic and diagnostic insights into how transplantation tolerance can persist inspite of recurrent infections and achieve long-term allograft survival superior to current therapies.
Graft acceptance without the need for drugs (a condition of immune tolerance) can be established in mice but remains an unfulfilled goal in human transplantation. This research program focuses on understanding how a state of robust transplantation tolerance that is resistant to reversal by infections is induced, monitored and maintained. Successful completion of this research will provide insights critical to the goal of transplantation tolerance as a transformative means to achieve life-long allograft function in humans.
|Alegre, Maria-Luisa (2018) What's new in transplantation tolerance? Curr Opin Organ Transplant 23:63-65|
|Miller, Michelle L; McIntosh, Christine M; Williams, Jason B et al. (2018) Distinct Graft-Specific TCR Avidity Profiles during Acute Rejection and Tolerance. Cell Rep 24:2112-2126|
|Chong, Anita S; Ansari, M Javeed (2018) Heterogeneity of memory B cells. Am J Transplant 18:779-784|
|Young, James S; Khiew, Stella H-W; Yang, Jinghui et al. (2017) Successful Treatment of T Cell-Mediated Acute Rejection with Delayed CTLA4-Ig in Mice. Front Immunol 8:1169|
|Khiew, Stella H; Yang, Jinghui; Young, James S et al. (2017) CTLA4-Ig in combination with FTY720 promotes allograft survival in sensitized recipients. JCI Insight 2:|
|Young, James S; McIntosh, Christine; Alegre, Maria-Luisa et al. (2017) Evolving Approaches in the Identification of Allograft-Reactive T and B Cells in Mice and Humans. Transplantation 101:2671-2681|
|Young, J S; Daniels, M D; Miller, M L et al. (2017) Erosion of Transplantation Tolerance After Infection. Am J Transplant 17:81-90|
|Miller, Michelle L; Alegre, Maria-Luisa; Chong, Anita S (2017) Transplantation tolerance after allograft rejection. Curr Opin Organ Transplant 22:64-70|
|Chong, A S; Khiew, S H (2017) Transplantation tolerance: don't forget about the B cells. Clin Exp Immunol 189:171-180|
|Chong, Anita S (2017) Alone Again, Naturally: B Cells Encountering Antigen Without T cells. Transplantation 101:1956-1958|
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