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Exp Biol Med (Maywood). 2015 Apr;240(4):527-33. doi: 10.1177/1535370214556948. Epub 2014 Oct 30.

Greater γ-tocopherol status during acute smoking abstinence with nicotine replacement therapy improved vascular endothelial function by decreasing 8-iso-15(S)-prostaglandin F2α.

Author information

1
Human Nutrition Program, Department of Human Sciences, The Ohio State University, Columbus, OH 43210, USA.
2
Department of Nutritional Sciences, University of Connecticut, Storrs, CT 06269, USA.
3
Department of Preventive Cardiology, Henry Low Heart Center, Hartford Hospital, Hartford, CT 06102, USA.
4
Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA.
5
Department of Kinesiology, University of Connecticut, Storrs, CT 06269, USA.
6
Human Nutrition Program, Department of Human Sciences, The Ohio State University, Columbus, OH 43210, USA Bruno.27@osu.edu.

Abstract

Nicotine replacement therapy (NRT) improves the long-term success rate of smoking cessation, but induces oxidative stress and inflammatory responses that may delay the restoration of vascular endothelial function (VEF). No studies have examined co-therapy of NRT-assisted smoking abstinence with γ-tocopherol (γ-T), a vitamin E form with antioxidant and anti-inflammatory activities, on improvements in VEF. In a randomized, double-blind, placebo-controlled study, healthy smokers (25 ± 1 y old; mean ± SEM) received NRT and abstained from smoking for 24 h with placebo (n = 12) or oral administration of γ-T-rich mixture of tocopherols (γ-TmT; n = 11) that provided 500 mg γ-T. Brachial artery flow-mediated dilation (FMD), and biomarkers of nitric oxide metabolism, antioxidant status, inflammation, and lipid peroxidation [8-iso-prostaglandin F2α stereoisomers (8-iso-15(R)-PGF2α and 8-iso-15(S)-PGF2α)] were measured prior to and after 24 h of smoking abstinence. Smoking abstinence with NRT regardless of γ-TmT similarly decreased urinary naphthol (P < 0.05) without affecting plasma cotinine. γ-TmT increased plasma γ-T by 4-times and the urinary metabolite of γ-T, γ-carboxyethyl-chromanol, by three times. Smoking abstinence with γ-TmT, but not smoking abstinence alone, increased FMD without affecting plasma nitrate/nitrite or the ratio of asymmetric dimethylarginine/arginine. Urinary 8-iso-15(S)-PGF2α decreased only in those receiving γ-TmT and was inversely correlated to FMD (R = -0.43, P < 0.05). Circulating markers of inflammation were unaffected by smoking abstinence or γ-TmT. Short-term NRT-assisted smoking abstinence with γ-TmT, but not NRT-assisted smoking abstinence alone, improved VEF by decreasing 8-iso-15(S)-PGF2α, a vasoconstrictor that was otherwise unaffected by NRT-assisted smoking abstinence.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT01314443.

KEYWORDS:

Vascular endothelial function; flow-mediated dilation; nicotine replacement therapy; smoking cessation; vitamin E

PMID:
25361769
PMCID:
PMC4935369
DOI:
10.1177/1535370214556948
[Indexed for MEDLINE]
Free PMC Article

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