Effect of a wild blueberry (Vaccinium angustifolium) drink intervention on markers of oxidative stress, inflammation and endothelial function in humans with cardiovascular risk factors
Wild blueberries (WB) (Vaccinium angustifolium) are rich sources of polyphenols, such as flavonols, phenolic acids and anthocyanins (ACNs), reported to decrease the risk of cardiovascular and degenerative diseases. This study investigated the effect of regular consumption of a WB or a placebo (PL) drink on markers of oxidative stress, inflammation and endothelial function in subjects with risk factors for cardiovascular disease.
Eighteen male volunteers (ages 47.8 ± 9.7 years; body mass index 24.8 ± 2.6 kg/m2) received according to a cross-over design, a WB (25 g freeze-dried powder, providing 375 mg of ACNs) or a PL drink for 6 weeks, spaced by a 6-week wash-out. Endogenous and oxidatively induced DNA damage in blood mononuclear cells, serum interleukin levels, reactive hyperemia index, nitric oxide, soluble vascular adhesion molecule concentration and other variables were analyzed.
Wild blueberry drink intake significantly reduced the levels of endogenously oxidized DNA bases (from 12.5 ± 5.6 % to 9.6 ± 3.5 %, p ≤ 0.01) and the levels of H2O2-induced DNA damage (from 45.8 ± 7.9 % to 37.2 ± 9.1 %, p ≤ 0.01), while no effect was found after the PL drink. No significant differences were detected for markers of endothelial function and the other variables under study.
In conclusion, the consumption of the WB drink for 6 weeks significantly reduced the levels of oxidized DNA bases and increased the resistance to oxidatively induced DNA damage. Future studies should address in greater detail the role of WB in endothelial function. This study was registered at www.isrctn.org as ISRCTN47732406.
KeywordsWild blueberry Endothelial function DNA damage Blood lipids Cardiovascular risk
American Association for Clinical Chemistry
Augmentation index standardized for heart rate of 75 bpm
Analysis of variance
Association of Official Analytical Chemists
Body mass index
Formamidopyrimidine DNA glycosylase
Framingham reactive hyperemia index
High-density lipoprotein cholesterol
High-performance liquid chromatography
Liquid chromatography/diode array detector/mass spectrometry
Low-density lipoprotein cholesterol
Least significant difference
Blood mononuclear cells
Peripheral arterial tone
Reactive hyperemia index
Soluble vascular adhesion molecule-1
Tumor necrosis factor alpha
Total serum cholesterol
Ultra-high-pressure liquid chromatography/mass spectrometry
This work was supported by a research grant (2007-5810) from the Cariplo Foundation (Milan, Italy) and by a contribution of the freeze-dried wild blueberry powder from the Wild Blueberry Association of North America (WBANA) and Future Ceuticals (Momence, IL, USA). We are grateful to F. Hoffmann-LaRoche for the gift of the photosensitizer. The funders and donors had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. We are grateful to the medical staff of AVIS (Associazione Italiani Volontari Sangue, via Edoardo Bassini 26, 20133 Milan, Italy), in particular Drs. Galastri and Verducci for their commendable support. We thank Dr. Marina Parolini (Istituto di Fisiologia Clinica CNR, Dipartimento Cardiovascolare, Ospedale Niguarda Ca’ Granda, Milan, Italy) for supervision of the statistical analysis. Moreover, we are grateful to all the volunteers who participated in the study for their time and effort.
Conflict of interest
The authors declare that they have no conflict of interest.
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