Mechanisms of chronic allograft dysfunction.

Area of Science:

• Transplantation immunology
• Organ preservation
• Graft dysfunction pathogenesis

Background:

• Late graft dysfunction is a significant challenge in transplantation.
• Both immune and nonimmune factors contribute to its development.
• Recent findings offer new insights into pathogenesis and potential treatments.

Purpose of the Study:

• To review new findings on the pathogenesis of late graft dysfunction.
• To identify key contributors to late graft failure.
• To highlight potential targets for novel therapeutic strategies.

Main Methods:

• Literature review of recent studies on graft dysfunction.
• Analysis of immune and nonimmune factors affecting graft survival.
• Evaluation of donor-related, preservation-related, and recipient-related variables.

Main Results:

• Donor age, tissue quality, preservation injury, and recipient factors (infections, hypertension, toxicity, hyperlipidemia) are associated with late graft failure.
• Total ischemic time significantly impacts long-term transplant outcomes.
• The Major Histocompatibility Complex (MHC) barrier remains a significant obstacle.
• B cells and alloantibodies, particularly donor-specific anti-human leukocyte antigen (HLA) antibodies, play a critical underestimated role in alloimmunity and prognosis.

Conclusions:

• Late graft dysfunction is multifactorial, involving a complex interplay of immune and nonimmune mechanisms.
• Controllable factors such as minimizing ischemic time and optimizing HLA matching are crucial for improving long-term allograft survival.
• Emerging evidence underscores the importance of alloantibody-mediated rejection and suggests new therapeutic targets for preventing graft failure.