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Vitamin E reverses cholesterol-induced endothelial dysfunction in the rabbit coronary circulation
T L Andersson1, J Matz, G A Ferns
1William Harvey Research Institute, St. Bartholomew's Hospital Medical College, London, UK.
Atherosclerosis
|November 1, 1994
Summary
High cholesterol impairs blood vessel function, leading to endothelial dysfunction. Vitamin E supplementation protected against this cholesterol-induced dysfunction in rabbit hearts, suggesting a potential therapeutic role.
Area of Science:
- Cardiovascular Science
- Nutritional Biochemistry
Background:
- Hypercholesterolemia and atherosclerosis are linked to impaired endothelium-dependent vasodilation.
- Endothelial dysfunction is a key factor in cardiovascular disease development.
Purpose of the Study:
- To investigate the effects of vitamin E on cholesterol-induced endothelial dysfunction in the rabbit coronary circulation.
- To determine if vitamin E can prevent or reverse endothelial dysfunction caused by high cholesterol.
Main Methods:
- Rabbits were fed control chow, a high-cholesterol diet, or a high-cholesterol diet supplemented with vitamin E for 4 or 8 weeks.
- Vasodilator responses to acetylcholine and sodium nitroprusside were assessed in isolated perfused rabbit hearts.
Main Results:
- Cholesterol feeding significantly impaired endothelium-dependent vasodilation (acetylcholine response) compared to controls.
- Vitamin E supplementation prevented the impairment of acetylcholine responses in cholesterol-fed rabbits.
- Vitamin E appeared to reverse the adverse effects of hypercholesterolemia on endothelial function.
Conclusions:
- Cholesterol feeding induces endothelial dysfunction in the rabbit coronary circulation.
- Vitamin E protects against and may reverse cholesterol-induced endothelial dysfunction.