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Vitamins C and E protect isolated cardiomyocytes against oxidative damage
T Rinne1, E Mutschler, G Wimmer-Greinecker
1Department of Thoracic and Cardiovascular Surgery, University of Frankfurt, Frankfurt/Main, Germany.
International Journal of Cardiology
|November 15, 2000
Summary
Vitamins E and C protect heart cells from oxidative damage. Simultaneous application of alpha-tocopherol (vitamin E) and ascorbic acid (vitamin C) offers a greater protective effect against singlet oxygen toxicity in cardiomyocytes.
Area of Science:
- Cardiology
- Biochemistry
- Oxidative Stress Research
Background:
- Oxygen free radicals contribute to myocardial reperfusion injury.
- Epidemiological studies suggest a link between low vitamin E and C levels and ischemic heart disease mortality.
Purpose of the Study:
- To investigate the protective effects of alpha-tocopherol (vitamin E) and ascorbic acid (vitamin C) against singlet oxygen-induced damage in isolated rat cardiomyocytes.
- To determine if combined administration of vitamins E and C enhances protection.
Main Methods:
- Isolated rat cardiomyocytes were exposed to singlet oxygen generated by photoactivated rose bengal.
- Cells were pretreated with varying concentrations of vitamin C or vitamin E.
- Simultaneous application of both vitamins was also tested.
Main Results:
- Singlet oxygen exposure caused hypercontracture in approximately 95% of cardiomyocytes.
- Pretreatment with vitamin C or E dose-dependently reduced hypercontracture.
- Combined vitamin E and C administration demonstrated a significant overadditive protective effect compared to individual vitamin treatments.
Conclusions:
- Alpha-tocopherol and ascorbic acid provide direct protection to cardiomyocytes against oxidative damage.
- Simultaneous administration of vitamins E and C yields synergistic protective benefits against oxidative stress.