Activation and regulation of alloreactive T cell immunity in solid organ transplantation

Transplantation is the only curative treatment for patients with kidney failure but it poses unique immunological challenges that must be overcome to prevent allograft rejection and ensure long-term graft survival. Alloreactive T cells are important contributors to graft rejection, and a clearer understanding of the mechanisms by which these cells recognize donor antigens - through direct, indirect or semi-direct pathways - will facilitate their therapeutic targeting. Post-T cell priming rejection responses can also be modified by targeting pathways that regulate T cell trafficking, survival cytokines or innate immune activation. Moreover, the quantity and quality of donor-reactive memory T cells crucially shape alloimmune responses. Of note, many fundamental concepts in transplant immunology have been derived from models of infection. However, the programmed differentiation of allograft-specific T cell responses is probably distinct from that of pathogen-elicited responses, owing to the dearth of pathogen-derived innate immune activation in the transplantation setting. Understanding the fundamental (and potentially unique) immunological pathways that lead to allograft rejection is therefore a prerequisite for the rational development of therapeutics that promote transplantation tolerance. Alloimmune T cell responses have a crucial role in graft rejection. Here, the authors examine the factors that regulate T cell activation, differentiation and function in secondary lymphoid organs and in the graft, including the different pathways of allorecognition, innate-adaptive immunity crosstalk and the role of survival cytokines.

Automated summary

Transplantation is the only curative treatment for kidney failure patients, but it faces unique immunological challenges that must be overcome to prevent graft rejection. Alloreactive T cells play a crucial role in graft rejection, and understanding their recognition mechanisms and immunological pathways during transplantation is essential for effective therapy.