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Updated: Aug 13, 2026
05:10
Investigating the Immunological Mechanisms Underlying Organ Transplant Rejection
Published on: August 20, 2007
[Immunopathology of acute rejection]
1Department of Pathology, Cedars-Sinai Medical Center and UCLA School of Medicine, Los Angeles, CA, USA. Arthur.Cohen@cshs.org
Summary
Acute transplant rejection involves T-cell and antibody-mediated immune responses. Understanding these mechanisms, like T-cell infiltration and C4d complement deposition, is key for transplant success.
Area of Science:
- Immunology
- Transplantation Science
- Pathology
Context:
- Acute transplant rejection is a significant clinical challenge.
- It arises from complex immunologic interactions between donor and recipient.
- Two primary mechanisms, T-cell-mediated and antibody-mediated, drive rejection.
Purpose:
- To delineate the distinct immunologic mechanisms underlying acute transplant rejection.
- To describe the pathological features of T-cell-mediated and antibody-mediated rejection.
- To highlight diagnostic markers such as CD8+ T cells and C4d deposition.
Summary:
- T-cell-mediated rejection involves T cells attacking donor alloantigens, manifesting in tubulo-interstitial, arterial, or glomerular damage.
- Antibody-mediated rejection presents in arterial (mural necrosis) or peritubular capillary forms.
- Peritubular capillary rejection is identified by C4d deposition, indicating complement activation and correlating with antidonor antibodies.
Impact:
- Provides a clear distinction between cellular and humoral rejection pathways.
- Enhances understanding of diagnostic criteria for acute transplant rejection.
- Informs strategies for preventing and managing transplant rejection.
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