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Serum total antioxidant activity in relative hypo- and hypercholesterolemia
M F Muldoon1, S B Kritchevsky, R W Evans
1Center for Clinical Pharmacology, University of Pittsburg School of Medicine, PA 15260, USA. mfm10+@pitt.edu
Free Radical Research
|September 1, 1996
Summary
Low serum cholesterol is linked to reduced antioxidant capacity, potentially increasing oxidative stress and susceptibility to non-atherosclerotic diseases. This study highlights a potential mechanism for unexplained mortality in individuals with hypocholesterolemia.
Area of Science:
- Biochemistry
- Nutritional Science
- Epidemiology
Background:
- Individuals with low serum cholesterol exhibit higher mortality rates from non-atherosclerotic diseases.
- The underlying mechanisms connecting hypocholesterolemia to increased mortality remain largely unknown.
- Oxidative stress is implicated in various chronic diseases, and cholesterol plays a role in antioxidant defense.
Purpose of the Study:
- To investigate the hypothesis that low serum cholesterol (hypocholesterolemia) is associated with diminished antioxidant reserve.
- To compare serum antioxidant activity, vitamin E, vitamin C, and thiol concentrations between low and high cholesterol groups.
- To explore potential gender differences in the relationship between cholesterol levels and antioxidant status.
Main Methods:
- A comparative study involving two groups of 24 subjects each, differentiated by mean low-density lipoprotein (LDL) cholesterol and total cholesterol levels.
- Measurements included serum total antioxidant activity, vitamin E, vitamin C, and thiol concentrations.
- Statistical analysis was performed to compare antioxidant markers between the low and high cholesterol groups, with adjustments for potential confounders like age, gender, and weight.
Main Results:
- The low cholesterol group demonstrated significantly lower total serum antioxidant activity compared to the high cholesterol group (p < .05).
- Thiol concentrations were also significantly reduced in individuals with low cholesterol (p < .05).
- While absolute vitamin E levels were lower in the low cholesterol group, the tocopherol:cholesterol ratio remained consistent between groups. No significant differences were observed in vitamin C levels.
Conclusions:
- Hypocholesterolemia is associated with a reduced serum antioxidant reserve.
- This diminished antioxidant capacity may contribute to increased susceptibility to oxidative stress in individuals with low cholesterol.
- The findings suggest a potential pathway linking low cholesterol to increased risk of non-atherosclerotic diseases through impaired antioxidant defense mechanisms.