Transplantation Immunology

Complications in organ and stem cell transplantation include rejection and infection, with infectious agents like cytomegalovirus and Epstein-Barr virus, and risks of cancer, osteoporosis, diabetes, hypertension, and hypercholesterolemia.

minor histocompatibility antigens are not hla proteins but show amino acid variation and can be recognized by foreign cells, including y chromosome antigens, and are weaker than immuno dominant masses.

Understand allorecognition as host T cells recognize graft antigens through direct and indirect pathways, aided by donor passenger leukocytes and antigen presenting cells, leading to potential graft rejection.

Orchestrate indirect allorecognition by signaling other cells to kill through cytokines released by helper T cells. Present graft antigens to T cells, triggering cytotoxic and delayed type hypersensitivity responses.

The immune system recognizes the graft and triggers rejection. Rejection appears as hyperacute, acute, or chronic, with first set and second set phases defining the transplantation-specific process.

Learn how preventing GvHD relies on irradiated blood and bone marrow products to deplete mature immunocompetent lymphocytes, with recipients categorized into high, intermediate, and low risk.

Administer corticosteroids to treat acute graft rejection by blocking cytokine production and inducing tolerance; cyclosporine inhibits cytotoxic t cell activation, while azathioprine remains a classic antirejection therapy with adverse effects.

Trace the evolution of transplantation from autographs and allografts to animal organ use, and explain gene modification and transcription factor programming to curb rejection and address donor supply.

Explore immune tolerance in transplantation, including direct and indirect recognition, central and peripheral tolerance, and strategies to achieve long-term graft acceptance through donor–recipient compatibility and HLA typing.