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Plasma apolipoprotein B levels predict platelet-dependent thrombosis in patients with coronary artery disease
M Shechter1, C N Bairey Merz, M J Paul-Labrador
1Preventive & Rehabilitative Cardiac Center and Atherosclerosis Research Center, Cedars-Sinai Burns and Allen Research Institute, Department of Medicine, Division of Cardiology, Cedars-Sinai Medical Center and UCLA School of Medicine, Los Angele, CA, USA.
Insights
Elevated apolipoprotein B, a risk factor for coronary artery disease (CAD), is linked to increased platelet-dependent thrombosis (PDT). This suggests apolipoprotein B may contribute to clot formation in arteries.
Area of Science:
- Cardiovascular Medicine
- Hematology
- Biochemistry
Background:
- Elevated plasma apolipoprotein B is a recognized risk factor for atherosclerotic coronary artery disease (CAD).
- The specific role of apolipoprotein B in arterial thrombosis remains largely unexplored.
- Understanding the prothrombotic potential of apolipoprotein B is crucial for CAD management.
Purpose of the Study:
- To investigate the relationship between apolipoprotein B levels and platelet-dependent thrombosis (PDT) in patients with CAD.
- To explore correlations between PDT and other metabolic factors including glucose and lipid profiles.
Main Methods:
- A prospective study involving 42 patients with established CAD.
- An ex vivo Badimon perfusion chamber was used to assess PDT by exposing porcine aortic media to patient blood.
- Measurements included apolipoprotein B, intracellular magnesium, fasting blood glucose, and various lipid parameters.
Main Results:
- Platelet-dependent thrombosis (PDT) showed a significant positive correlation with apolipoprotein B levels (r = 0.41, p = 0.009).
- PDT also correlated significantly with intracellular magnesium (r = -0.46, p = 0.003) and fasting blood glucose (r = 0.47, p = 0.002).
- No significant correlation was found between PDT and serum lipids (total cholesterol, LDL, HDL), apolipoprotein A-I, or fibrinogen.
Conclusions:
- Elevated apolipoprotein B levels are associated with increased platelet-dependent thrombosis in CAD patients.
- These findings suggest that the prothrombotic effects of apolipoprotein B may contribute to its established role in CAD pathogenesis.
- Further research is warranted to elucidate the mechanisms linking apolipoprotein B to arterial thrombosis.
Abstract:
Elevated plasma apolipoprotein B is a known risk factor for atherosclerotic coronary artery disease (CAD), however its relationship to arterial thrombosis is unexplored. We prospectively assessed apolipoprotein B and platelet-dependent thrombosis (PDT) in 42 CAD patients (37 men, 5 women, mean age 68 +/- 9 years), by exposing porcine aortic media to their flowing unanticoagulated venous blood for 5 min using an ex vivo perfusion (Badimon) chamber. PDT was significantly correlated with apolipoprotein B (r = 0.41, p = 0.009), intracellular magnesium levels (r = -0.46, p = 0.003) fasting blood glucose (r = 0.47, p = 0.002), and total cholesterol (r = 0.43, p = 0.006). PDT did not correlate with serum total cholesterol, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, apolipoprotein A-I or fibrinogen levels. These findings suggest that the positive relationship of elevated apolipoprotein B to CAD may be, in part, related to its prothrombotic effects.