Related Experiment Videos
Inflammation, the endothelium, and the acute coronary syndromes
S Kinlay1, A P Selwyn, P Libby
1Division of Cardiovascular Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA.
Insights
Inflammation drives plaque instability in atherosclerosis, leading to acute coronary syndromes. Biomarkers like C-reactive protein may help monitor cardiovascular risk and treatment effectiveness.
Area of Science:
- Cardiovascular Medicine
- Inflammation Biology
- Atherosclerosis Research
Background:
- Acute coronary syndromes frequently result from the disruption of atherosclerotic plaques.
- Plaque instability is closely linked to the inflammatory processes within the vessel wall.
- Inflammatory mediators, including cytokines and metalloproteinases, degrade the plaque's fibrous cap.
Purpose of the Study:
- To explore the role of vascular inflammation in atherosclerotic plaque instability.
- To investigate the clinical significance of specific inflammatory markers in coronary artery disease.
- To assess the potential of these markers for monitoring therapeutic interventions.
Main Methods:
- Review of mechanisms involving inflammatory cell recruitment and adhesion molecules in atherosclerosis.
- Analysis of elevated biomarkers such as C-reactive protein, interleukin-6, plasminogen activator inhibitor-1, and tissue plasminogen activator in acute coronary syndromes.
- Correlation of these markers with vascular inflammation and plaque stability.
Main Results:
- Inflammatory cell infiltration, mediated by adhesion molecules and chemoattractants, contributes to plaque vulnerability.
- Oxidation of low-density lipoprotein is a key trigger for inflammatory responses in the vessel wall.
- Elevated levels of acute-phase reactants and fibrinolytic markers are observed in patients with acute coronary syndromes and those at high risk.
Conclusions:
- Biomarkers such as C-reactive protein and interleukin-6 may indicate underlying vascular inflammation and atherosclerotic plaque stability.
- Measurement of these markers could elucidate the benefits of interventions like cholesterol-lowering therapy.
- These markers hold potential for monitoring the effectiveness of coronary risk factor reduction strategies.
Abstract:
Disruption of atherosclerotic plaques with associated thrombus is responsible for the majority of the acute coronary syndromes. Plaque instability is related closely to the degree of inflammation. Inflammatory cells within the plaque produce cytokines that inhibit collagen production by vascular smooth muscle cells and increase the production of metalloproteinases, which degrade the extracellular matrix in the fibrous cap. The recruitment of inflammatory cells into the vessel wall occurs in a coordinated sequence of events involving the expression of cellular adhesion molecules on the surface of activated endothelial cells and the production of chemoattractants, and occurs in part in response to oxidation of low-density lipoprotein within the vessel wall. The cellular adhesion molecules are shed into the circulating blood in several disease states, including clinically evident atherosclerosis. The acute-phase reactants C-reactive protein and interleukin-6, and markers of the fibrinolytic state (plasminogen activator inhibitor-1 and tissue plasminogen activator), are also elevated in the acute coronary syndromes and in healthy individuals at increased risk for developing coronary artery disease. These markers may reflect vascular inflammation and thereby the stability of atherosclerotic plaques. Their measurement may pinpoint the mechanisms of benefit of cholesterol-lowering therapy and other interventions designed to reduce coronary risk, and potentially could offer a new method for monitoring coronary risk factor reduction in patients.