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Apoptosis in heart transplantation
1Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, USA.
Abstract:
Apoptosis, or programmed cell death, is a mechanism of cell death that plays a major role during development, homeostasis, and in many disease states. The interaction of the cell membrance protein, Fas, with its ligand, Fas ligand, induces apoptosis in Fas-bearing cells. Several factors induce apoptosis in mammalian cardiomyocytes, including reperfusion injury, hypoxia, mechanical stretch, myocardial infarction, rapid ventricular pacing, and hypertensive heart failure. Although studies in the transplanted hearts of rodents and humans have shown the presence of Fas, Fas ligand, and apoptosis in the myocardium, there is controversy regarding which cells in the myocardium are actually undergoing apoptosis after heart transplantation. It is even less clear what type of relationship, if any, apoptosis has to allograft rejection or post-transplant graft coronary vasculopathy. This review summarizes the current knowledge regarding apoptosis in the transplanted heart and discusses some of the controversies surrounding this new and rapidly expanding area of investigation.
Insights
Apoptosis, or programmed cell death, is crucial in heart transplantation. This review explores its role and controversies in transplanted heart rejection and vasculopathy.
Area of Science:
- Cardiovascular Science
- Immunology
- Cell Biology
Background:
- Apoptosis, programmed cell death, is vital in development and disease.
- Fas/Fas ligand interactions trigger apoptosis in Fas-bearing cells.
- Cardiomyocytes undergo apoptosis due to various stressors like hypoxia and infarction.
Purpose of the Study:
- To review current knowledge on apoptosis in transplanted hearts.
- To discuss controversies regarding apoptotic cells in the myocardium post-transplantation.
- To explore the relationship between apoptosis and allograft rejection or graft vasculopathy.
Main Methods:
- Literature review of studies on apoptosis in transplanted hearts.
- Analysis of findings on Fas, Fas ligand, and apoptosis in myocardial tissue.
- Examination of evidence linking apoptosis to transplant outcomes.
Main Results:
- Studies confirm Fas, Fas ligand, and apoptosis in transplanted hearts.
- Controversy exists regarding which myocardial cells undergo apoptosis.
- The link between apoptosis and allograft rejection/vasculopathy remains unclear.
Conclusions:
- Apoptosis is present in transplanted hearts, but its cellular targets are debated.
- Further research is needed to clarify apoptosis's role in transplant rejection and vasculopathy.
- Understanding apoptosis is critical for improving outcomes in heart transplantation.