Abstract
Objective: To examine the effects of vitamin C supplementation on the concentration of oxidation markers, in particular, circulating oxidized LDL (OxLDL) and on endothelial activation markers.
Design: Randomized double-blind, placebo-controlled crossover trial.
Setting: Belgian population of the city of Leuven.
Subjects: A total of 34 healthy male smokers aged 26–73 y.
Intervention: Smokers were randomly assigned to receive either vitamin C (250 mg twice daily) or placebo capsules, each to be taken for 4 weeks. After a 1-week washout period, participants then crossed over to the alternative capsules for further 4 weeks.
Mean outcome measures: Markers of oxidation (bilirubin, uric acid, α-tocopherol, retinol, malondialdehyde, circulating Oxidized LDL (OxLDL)) and markers of endothelial activation (sICAM-1, sVCAM-1, vWF-antigen) were analysed.
Results: Plasma ascorbate concentrations significantly increased from 46.6±17.6 to 70.1±21.2 μmol/l after a 4-week treatment with 500 mg vitamin C per day. The other plasma antioxidants concentrations, including bilirubin, uric acid, α-tocopherol and retinol, were similar in both treatment periods. Vitamin C did not change plasma malondialdehyde and circulating OxLDL compared with placebo (vitamin C 0.73±0.25 mg/dl OxLDL; placebo 0.72±0.21 mg/dl OxLDL). After vitamin C supplementation, neither sICAM-1 and sVCAM-1 levels nor the concentration of vWF-antigen significantly differed from placebo condition.
Conclusions: Oral supplementation of vitamin C is not associated with changes in markers of oxidation or endothelial activation in healthy male smokers.
Sponsorship: The Unilever Chair in Nutritional Epidemiology, University of Leuven, Belgium.
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Acknowledgements
We thank the volunteers for their participation in the study. We thank the personnel of the division of Youth Health Care (University of Leuven) for taking the blood samples, Centre of Experimental Surgery and Anaesthesiology (University of Leuven) for assisting with OxLDL, sICAM-1 and sVCAM-1 determinations and Metabolic Research Unit (University of Antwerp) for performing the analysis of plasma ascorbate, α-tocopherol, retinol and malondialdehyde.
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Van Hoydonck, P., Schouten, E., Manuel-y-Keenoy, B. et al. Does vitamin C supplementation influence the levels of circulating oxidized LDL, sICAM-1, sVCAM-1 and vWF-antigen in healthy male smokers?. Eur J Clin Nutr 58, 1587–1593 (2004). https://doi.org/10.1038/sj.ejcn.1601990
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DOI: https://doi.org/10.1038/sj.ejcn.1601990
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