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The immunological background to transplantation

¹Department of Immunology, Salford Royal Hospitals NHS Trust, Hope Hospital, UK.

The Journal of Antimicrobial Chemotherapy

|October 1, 1995

Summary

Organ transplant rejection occurs unless donors and recipients are genetically identical. T lymphocytes, particularly CD4+ T cells, recognize foreign antigens, initiating a systemic immune response that leads to graft rejection.

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Area of Science:

Immunology
Transplantation Biology

Background:

Organ transplantation is a clinical solution for irreversible organ dysfunction.
Graft rejection is a major hurdle, occurring when donor and recipient are not genetically identical.
Early tumor transplantation experiments revealed limitations, leading to the 'laws of transplantation'.

Observation:

Sir Peter Medawar's work confirmed rejection as a systemic, lymphocyte-governed process.
Studies on skin graft rejection in mice identified the major histocompatibility complex (MHC) antigens.
MHC antigens present processed antigens to T lymphocytes, crucial for immune recognition.

Findings:

T lymphocytes are central to transplant rejection.
The sensitization phase involves recipient CD4+ T cells recognizing foreign passenger leukocytes in the graft.
The effector phase involves activated T cells producing cytokines within the graft, driving rejection.

Implications:

Understanding T cell roles in rejection enhances knowledge of T cell physiology.
Preventing rejection has spurred the development of novel immunomodulating agents.
These immunomodulatory strategies have broader applications in treating various immunological disorders.

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