Effects of de-alcoholised wines with different polyphenol content on DNA oxidative damage, gene expression of peripheral lymphocytes, and haemorheology: an intervention study in post-menopausal women
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Epidemiological studies suggest that a moderate consumption of wine is associated with a reduced risk of cardiovascular diseases and with a reduced mortality for all causes, possibly due to increased antioxidant defences. The present intervention study was undertaken to evaluate the in vivo effects of wine polyphenols on gene expression in humans, along with their supposed antioxidant activity.
Blood haemorheology and platelet function were also evaluated. In order to avoid interferences from alcohol, we used de-alcoholised wine (DAW) with different polyphenol content. A randomised cross-over trial of high-proanthocyanidin (PA) red DAW (500 mL/die, PA dose = 7 mg/kg b.w.) vs. low-PA rosé DAW (500 mL/die, PA dose = 0.45 mg/kg) was conducted in 21 post-menopausal women in Florence, Italy. Oxidative DNA damage by the comet assay and gene expression by microarray was measured in peripheral blood lymphocytes, collected during the study period. Blood samples were also collected for the evaluation of haematological, haemostatic, haemorheological, and inflammatory parameters.
The results of the present study provide evidence that consumption of substantial amounts of de-alcoholised wine for 1 month does not exert a protective activity towards oxidative DNA damage, nor modifies significantly the gene expression profile of peripheral lymphocytes, whereas it shows blood-fluidifying actions, expressed as a significant decrease in blood viscosity. However, this effect does not correlate with the dosage of polyphenols of the de-alcoholised wine.
More intervention studies are needed to provide further evidence of the health-protective effects of wine proanthocyanidins.
KeywordsProanthocyanidins Wine DNA damage Comet assay Microarray Transcriptomics
We are very grateful to the volunteers who donated their time and adjusted their ordinary lifestyle to participate in this demanding study. We also thank Magali Bes (INRA-Unité Expérimentale de Pech Rouge, Gruissan, France) for making the DAW. The study was supported by the the EU program FLAVO 2005-513960, the Network of Excellence in Nutrigenomics, NuGO FOOD-CT-2004-506360, the Ministero della Università e della Ricerca Scientifica e Tecnologica (Italy), and the University of Florence.
Conflict of interest statement
The authors declare that they have no conflict of interest.
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