γ-Tocopherol-rich supplementation additively improves vascular endothelial function during smoking cessation

Area of Science:

• Cardiovascular Research
• Nutritional Science
• Smoking Cessation Research

Background:

• Persistent oxidative stress and inflammation post-smoking cessation limit vascular endothelial function (VEF) recovery.
• Short-term smoking cessation improves VEF, but the impact of combining it with antioxidant therapy remains unexplored.
• Gamma-tocopherol (γ-T) is a potent antioxidant with potential to mitigate smoking-induced vascular damage.

Purpose of the Study:

• To investigate if γ-T supplementation combined with smoking cessation enhances VEF beyond smoking cessation alone.
• To determine if γ-T supplementation reduces oxidative stress and inflammation markers associated with smoking.
• To assess the impact of γ-T on brachial artery flow-mediated dilation (FMD) in young smokers.

Main Methods:

• A randomized, double-blind, placebo-controlled trial involving 30 healthy young smokers.
• Participants underwent 7 days of smoking cessation, receiving either placebo or 500 mg/day of γ-T-rich supplementation.
• Measurements included FMD, plasma cotinine, antioxidant status, oxidative stress, and inflammation biomarkers.

Main Results:

• Smoking cessation decreased cotinine in both groups; γ-T supplementation significantly increased plasma γ-T and its metabolite.
• VEF, measured by FMD, improved by 4.1% with γ-T plus cessation versus 2.8% with placebo plus cessation (P<0.05).
• γ-T supplementation reduced plasma TNF-α and myeloperoxidase, which correlated inversely with FMD improvements.

Conclusions:

• Short-term γ-T supplementation combined with smoking cessation improves VEF in young smokers more effectively than cessation alone.
• The enhanced VEF appears to be mediated by a reduction in key proinflammatory mediators like TNF-α and myeloperoxidase.
• This study supports the potential of antioxidant co-therapy to accelerate vascular health recovery after smoking cessation.