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Does vitamin C supplementation influence the levels of circulating oxidized LDL, sICAM-1, sVCAM-1 and vWF-antigen in healthy male smokers?

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, alpha-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 mumol/l after a 4-week treatment with 500 mg vitamin C per day. The other plasma antioxidants concentrations, including bilirubin, uric acid, alpha-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.

journal_name

Eur J Clin Nutr

journal_title

European journal of clinical nutrition

authors

Van Hoydonck PG,Schouten EG,Manuel-Y-Keenoy B,van Campenhout A,Hoppenbrouwers KP,Temme EH

doi

10.1038/sj.ejcn.1601990

subject

Has Abstract

pub_date

2004-12-01 00:00:00

pages

1587-93

issue

12

eissn

0954-3007

issn

1476-5640

pii

1601990

journal_volume

58

pub_type

临床试验,杂志文章,随机对照试验

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