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Updated: Jun 16, 2026

Investigating the Immunological Mechanisms Underlying Organ Transplant Rejection
Published on: August 20, 2007
Mechanisms involved in antibody- and complement-mediated allograft rejection
1Department of Pathology, The Johns Hopkins University School of Medicine, Ross Bldg. 664B, Baltimore, MD 21205, USA. bwasowsk@jhmi.edu
Antibody-mediated rejection causes allograft loss and is resistant to therapy. This review explores complement pathways and effector cell interactions in antibody-mediated endothelial cell injury during organ transplantation.
Area of Science:
- Immunology
- Transplantation Biology
- Pathogenesis of Rejection
Background:
- Antibody-mediated rejection (AMR) is a primary cause of organ transplant failure.
- AMR is often refractory to standard immunosuppressive treatments.
- Endothelial cell injury is a key mechanism in AMR.
Purpose of the Study:
- To review the mechanisms of antibody- and complement-mediated endothelial cell injury in vascularized organ transplantation.
- To elucidate the role of C1q- and mannose-binding lectin (MBL)-dependent complement pathways in AMR.
- To discuss the involvement of effector cells like macrophages and monocytes in AMR.
Main Methods:
- Development of experimental animal models for studying vascularized organ transplantation.
- Analysis of complement activation pathways (C1q-dependent and MBL-dependent).
- Investigation of effector cell interactions via Fcgamma and complement receptors.
Main Results:
- Antibody binding to the graft initiates complement activation.
- Complement activation leads to endothelial cell damage and graft rejection.
- Effector cells, recruited via Fcgamma and complement receptors, contribute to injury.
Conclusions:
- Understanding complement pathways is crucial for managing AMR.
- Targeting complement activation may offer novel therapeutic strategies for AMR.
- Effector cell interactions are integral to the pathogenesis of AMR.
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