Related Experiment Videos
A role for reduced coenzyme Q in atherosclerosis?
S R Thomas1, P K Witting, R Stocker
1Biochemistry Group, Heart Research Institute, Camperdown, NSW, Australia.
Biofactors (Oxford, England)
|July 23, 1999
Summary
Oxidative modification of low-density lipoprotein (LDL) contributes to atherosclerosis. This review details how alpha-tocopherol and ubiquinol-10 protect LDL lipids from oxidation, offering insights into antioxidant defense mechanisms.
Area of Science:
- Biochemistry
- Cardiovascular Research
- Nutritional Science
Background:
- Oxidative modification of low-density lipoprotein (LDL) is a key factor in atherogenesis.
- Alpha-tocopherol (alpha-TOH), the primary lipid-soluble antioxidant in LDL, plays a crucial role in preventing lipid peroxidation.
- Plasma LDL also contains ubiquinol-10 (CoQ10H2), the reduced form of coenzyme Q10, at lower concentrations.
Purpose of the Study:
- To review the molecular mechanisms of alpha-tocopherol's antioxidant action in LDL.
- To discuss the role of ubiquinol-10 as an efficient antioxidant defense for lipoprotein lipids.
- To examine the levels of antioxidants and oxidation products in patients with coronary artery disease and assess coenzyme Q10 supplementation in an animal model.
Main Methods:
- Review of existing literature on alpha-tocopherol and ubiquinol-10 in LDL oxidation.
- Analysis of antioxidant and lipid oxidation product levels in human atherosclerotic tissue.
- Preliminary in vivo study using apolipoprotein E knockout mice supplemented with coenzyme Q10.
Main Results:
- Alpha-tocopherol can exhibit both pro- and antioxidant activities depending on the oxidant environment.
- Low levels of ubiquinol-10 can provide significant antioxidant protection to LDL lipids.
- Elevated levels of lipid oxidation products and altered antioxidant profiles are observed in coronary artery disease.
Conclusions:
- Understanding the complex roles of alpha-tocopherol and ubiquinol-10 is vital for comprehending LDL oxidation and atherogenesis.
- Ubiquinol-10 may represent a critical, yet often overlooked, component of lipoprotein antioxidant defense.
- Further research, including clinical trials on coenzyme Q10 supplementation, is warranted to explore its therapeutic potential in preventing or slowing atherosclerosis.