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Endothelial dysfunction in coronary heart disease
1Emory University School of Medicine, Division of Cardiology, Atlanta, GA 30322, USA.
Insights
Atherosclerosis plaque rupture risk can be reduced by lowering lipid and macrophage content. Addressing endothelial dysfunction is crucial for preventing early-stage atherosclerosis and cardiovascular events.
Area of Science:
- Cardiovascular Science
- Pathology
- Medical Research
Background:
- Atherosclerosis involves plaque buildup in vessel walls, leading to lumen obstruction.
- Vulnerable plaques, rich in lipids and macrophages, pose a higher rupture risk than stable lesions.
Purpose of the Study:
- To explore strategies for stabilizing atherosclerotic plaques and reducing cardiovascular event risk.
- To investigate the role of endothelial dysfunction in early atherosclerosis pathogenesis.
Main Methods:
- Review of current hypotheses on atherosclerosis pathogenesis.
- Analysis of findings from cholesterol-lowering and antithrombotic therapy trials.
Main Results:
- Cholesterol-lowering interventions significantly reduce acute cardiac events.
- Antithrombotic therapies can mitigate consequences of plaque rupture.
- Endothelial dysfunction is a key early stage requiring further investigation.
Conclusions:
- Reducing plaque lipid and macrophage content may stabilize vulnerable plaques.
- Targeting endothelial dysfunction is essential for preventing atherosclerosis progression.
- Combined approaches addressing plaque composition and endothelial health are vital for cardiovascular risk reduction.
Abstract:
Atherosclerosis is a chronic disease characterized by the focal accumulation of plaque (leukocytes, macrophages, smooth muscle cells, lipids, and extracellular matrix) in the vessel wall that ultimately leads to obstruction of the lumen through gradual progression, plaque rupture with intraluminal thrombosis, or both. The "vulnerable" plaque is smaller in size, richer in lipids, and more infiltrated with macrophages than the stable fibromuscular lesion. Therefore, lowering the lipid or macrophage pools stored in the plaque may stabilize the plaque and reduce the risk for plaque rupture. Indeed, cholesterol-lowering trials have yielded a significant reduction in acute cardiac events. Antithrombotic therapy may further prevent acute coronary syndromes by altering the consequences of plaque rupture. However, we need to address the earlier stages of atherosclerosis, namely, endothelial dysfunction. Current hypotheses concerning its pathogenesis focus on vascular endothelial injury, the oxidation of low-density lipoprotein and its effects on the endothelium, which set off a cascade or responses involving the complex interaction of growth factors and cytokines leading to increased oxidative stress, increased free radical formation, destruction of nitric oxide, endothelial dysfunction, increased platelet aggregation, thrombosis, inflammation, plaque formation, proteolysis, plaque fissure, and rupture.