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Nitric oxide and endothelin in the development of cardiac allograft vasculopathy. Potential targets for therapeutic
Z Liu1, S M Wildhirt, S Weismüller
1Department of Cardiac Surgery, Ludwig-Maximilians University, Munich, Germany.
Abstract:
Extensive research has been carried out in recent years to discover the potential risk factors contributing to cardiac allograft atherogenesis. Injury to endothelial cells has been regarded as an important early mechanism in the development of transplant atherosclerosis; it leads to the manifestation of epicardial and microvascular endothelial dysfunction and development of intimal hyperplasia. Moreover, continuous minor endothelial cell damage contributes to endothelial dysfunction which reflects one of the first measurable steps in the cascade of atherogenesis without macroscopic evidence of vascular lesions. The discovery of two important vasoactive substances nitric oxide (NO) and endothelin (ET) has brought new insights but also new unsolved questions regarding the mechanisms leading to atherosclerosis. To date it is known that both substances play a major role in both prevention and development of atherosclerosis. NO appears to be protective in low concentrations by inhibiting leukocyte and platelet activation/adherence and smooth muscle cell proliferation. Impaired endothelial NO production, as one cause of endothelial dysfunction may occur in early stages of atherosclerosis before macroscopic lesions are evident. In addition, increased endothelin release also results in endothelial dysfunction by inducing vasoconstriction; it promotes vascular lesion formation due to endothelial- and vascular smooth muscle cell proliferation. Direct and indirect manipulation of both the NO and ET signal transduction systems may provide novel preventive and therapeutic approaches for limiting transplant atherogenesis and to treat native atherosclerosis. This review summarizes important experimental and clinical evidence which points to nitric oxide and endothelin as potential therapeutic targets in the process of cardiac allograft vasculopathy.
Insights
Cardiac allograft atherogenesis involves endothelial cell injury, leading to dysfunction. Nitric oxide (NO) and endothelin (ET) play critical roles, offering potential therapeutic targets for transplant vasculopathy.
Area of Science:
- Cardiovascular Research
- Transplantation Immunology
- Vascular Biology
Background:
- Endothelial cell injury is an early mechanism in cardiac allograft atherogenesis, causing dysfunction and intimal hyperplasia.
- Endothelial dysfunction precedes macroscopic vascular lesions, representing an early step in atherogenesis.
- Nitric oxide (NO) and endothelin (ET) are key vasoactive substances influencing atherosclerosis development.
Purpose of the Study:
- To review experimental and clinical evidence on risk factors for cardiac allograft atherogenesis.
- To explore the roles of nitric oxide (NO) and endothelin (ET) in transplant atherosclerosis.
- To identify NO and ET as potential therapeutic targets for cardiac allograft vasculopathy.
Main Methods:
- Literature review of experimental and clinical studies.
- Analysis of the roles of nitric oxide (NO) and endothelin (ET) in endothelial function and dysfunction.
- Synthesis of evidence regarding therapeutic strategies targeting NO and ET pathways.
Main Results:
- Endothelial dysfunction, driven by factors like NO and ET imbalance, is central to transplant atherosclerosis.
- NO may be protective at low concentrations, inhibiting cellular activation and proliferation.
- ET contributes to endothelial dysfunction and vascular lesion formation through vasoconstriction and proliferation promotion.
Conclusions:
- Nitric oxide (NO) and endothelin (ET) signaling pathways are crucial in cardiac allograft vasculopathy.
- Targeting NO and ET pathways presents promising preventive and therapeutic strategies.
- Further research into NO and ET manipulation could limit transplant atherogenesis and treat native atherosclerosis.