The Shared Trail of Organ, Limb, and Face Transplantation.

The article focuses on the historical and immunological foundations linking organ, limb, and face transplantation, emphasizing the role of donor leukocyte chimerism in graft acceptance and tolerance. It traces the development of kidney transplantation beginning in 1959, highlighting early successes with fraternal twins and the introduction of immunosuppressive drugs such as azathioprine and prednisone, which enabled longer graft survival. The discovery in the early 1990s of microchimerism—small populations of donor leukocytes migrating from transplanted organs into recipients—revealed that organ transplantation inherently involves donor leukocyte infusion, paralleling bone marrow transplantation. This dual immune interaction between donor and recipient cells, modulated by immunosuppression, explains the variable outcomes of rejection, tolerance, or graft-versus-host disease. The article concludes that understanding these mechanisms has informed improved immunosuppressive protocols and holds promise for reducing lifelong immunosuppression in complex transplants such as limbs and faces. [Extracted from the article]