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Endothelial transcripts uncover a previously unknown phenotype: C4d-negative antibody-mediated rejection.
1Department of Laboratory Medicine and Pathology, University of Alberta, Alberta, Canada. bsis@ualberta.ca
Current Opinion in Organ Transplantation
|December 17, 2009
Summary
A new phenotype, C4d-negative antibody-mediated rejection (ABMR), has been identified in kidney transplants. This condition, characterized by specific gene expression, is common and linked to poor graft survival, highlighting the need for advanced diagnostic methods.
Area of Science:
- Nephrology
- Transplantation Immunology
- Molecular Pathology
Background:
- Alloantibody responses are increasingly recognized in organ transplantation.
- Phenotypes of antibody-mediated rejection (ABMR) are not fully understood.
- Molecular studies are crucial for defining ABMR mechanisms.
Purpose of the Study:
- To review molecular studies in kidney allografts.
- To decipher molecular burden and mechanisms of ABMR.
- To identify a new phenotype of ABMR: C4d-negative ABMR.
Main Methods:
- Analysis of molecular studies in kidney allograft tissues.
- Assessment of endothelial gene expression in kidney transplant biopsies.
- Detection of anti-human leukocyte antigen alloantibodies.
Main Results:
- High endothelial gene expression in biopsies with alloantibodies indicates active ABMR.
- C4d-negative ABMR is characterized by high intragraft endothelial gene expression and poor outcomes.
- C4d-negative ABMR is twice as common as C4d-positive ABMR and is the leading cause of late kidney transplant loss.
Conclusions:
- C4d staining is insensitive for detecting ABMR.
- Endothelial gene expression measurement is a sensitive and specific method for diagnosing ABMR.
- Molecular phenotyping aids in predicting kidney transplant graft outcomes.
