Related Experiment Videos
Endothelial activation and development of coronary artery disease in transplanted human hearts
C A Labarrere1, D R Nelson, W P Faulk
1Center for Reproduction and Transplantation Immunology, Methodist Research Institute, Indianapolis, IN 46202, USA.
Insights
Early endothelial activation in heart transplants predicts coronary artery disease and graft failure. This finding is crucial for developing new therapies to improve long-term transplant outcomes.
Area of Science:
- Cardiovascular Research
- Transplantation Immunology
- Vascular Biology
Background:
- Coronary artery disease (CAD) is a major cause of graft failure in heart transplant recipients.
- Early identification of at-risk allografts is critical for timely therapeutic interventions.
- Prolonging allograft function necessitates understanding early disease mechanisms.
Purpose of the Study:
- To investigate whether early arterial/arteriolar endothelial activation predicts CAD development in transplanted hearts.
- To determine the association between endothelial activation and graft failure.
- To assess the predictive value of endothelial activation markers for long-term transplant outcomes.
Main Methods:
- Prospective cohort study involving 121 adult cardiac allograft recipients.
- Endomyocardial biopsies analyzed for endothelial activation markers (ICAM-1, HLA-DR) via immunocytochemistry.
- Annual coronary angiograms used to assess CAD presence and progression.
- Follow-up data collected through 1996.
Main Results:
- No donor hearts showed pre-transplant endothelial activation.
- Endothelial activation was observed in 78/121 allografts within 3 months post-transplant.
- Early endothelial activation significantly correlated with increased risk, progression, and earlier onset of CAD (P<.001).
- Patients with endothelial activation had higher rates of mortality or re-transplantation (P<.001).
Conclusions:
- Early arterial/arteriolar endothelial activation is a significant predictor of CAD development in heart allografts.
- Endothelial activation is associated with an increased risk of graft failure in heart transplant recipients.
- These findings highlight endothelial activation as a key biomarker for monitoring and managing heart transplant recipients.
Context:
The development of coronary artery disease in heart transplants is often associated with graft failure. Early detection of allografts prone to develop this disease is essential to institute new therapeutic approaches that could prolong allograft function.
Objective:
To determine if early activation of arterial/arteriolar endothelium predicts the development of coronary artery disease, graft failure, or both in transplanted human hearts.
Design:
Prospective cohort study.
Setting:
Heart Transplant Center.
Participants:
A total of 121 consecutive adult cardiac allograft recipients who received transplants between 1988 and 1995 and were followed up through 1996.
Main Outcome Measures:
Development of coronary artery disease and graft failure.
Methods:
Immunocytochemistry was performed on serial endomyocardial biopsy specimens to evaluate endothelial activation markers (intercellular adhesion molecule-1 and histocompatibility antigen HLA-DR) in arteries and arterioles. The presence and progression of coronary artery disease was evaluated by annual coronary angiograms with side-by-side comparisons.
Results:
None of the 121 donor hearts showed arterial/arteriolar endothelial activation before transplantation. Arterial/arteriolar endothelial activation was present in 78 and absent in 43 of 121 allografts during the first 3 months after transplantation. The time of appearance and the proportion of biopsy specimens showing endothelial activation during these first 3 months were significantly associated with the risk of developing coronary artery disease, the progression of the disease, and the time required to develop the disease (P<.001). Significantly more patients with arterial/arteriolar endothelial activation died or received a second transplant (P<.001).
Conclusions:
Activation of arterial/arteriolar endothelium in transplanted human hearts predicts development of coronary artery disease and increased risk of graft failure.