Harnessing Regulatory T Cells for Immune Modulation in Transplantation Tolerance

Regulatory T cells (Tregs) are pivotal in maintaining immune tolerance and preventing allograft rejection in transplantation. This review explores the mechanisms by which Tregs mediate immune modulation and their potential therapeutic applications in promoting transplantation tolerance. Tregs are characterized by the expression of CD4, CD25, and the transcription factor FOXP3, and they play a critical role in suppressing effector T cell responses and promoting an anti-inflammatory environment. Various strategies for harnessing Tregs for transplantation include the expansion of Tregs ex vivo, the induction of Tregs in vivo through various approaches, and the transfer of Tregs into transplant recipients. Furthermore, we discuss the impact of the transplant environment on Treg function, the role of dendritic cells and cytokines in Treg activation, and the significance of gut-derived Tregs in fostering tolerance. Additionally, we address the challenges of using Tregs in clinical settings, including potential risks such as opportunistic infections and malignancies. Ultimately, harnessing Tregs represents a promising avenue for achieving transplantation tolerance and improving long-term graft survival, and ongoing research is crucial for developing effective and safe strategies for clinical application. Keywords: Regulatory T cells, Transplantation tolerance, Immune modulation, Allograft rejection, Treg therapy