Abstract
Purpose
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.
Methods
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.
Results
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.
Conclusions
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.
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Abbreviations
- AACC:
-
American Association for Clinical Chemistry
- ACNs:
-
Anthocyanins
- AI:
-
Augmentation index
- AI@75:
-
Augmentation index standardized for heart rate of 75 bpm
- ANOVA:
-
Analysis of variance
- AOAC:
-
Association of Official Analytical Chemists
- ALT:
-
Alanine aminotransferase
- AST:
-
Aspartate aminotransferase
- BMI:
-
Body mass index
- CI:
-
Confidence interval
- CRP:
-
C-reactive protein
- CVD:
-
Cardiovascular disease
- FMD:
-
Flow-mediated dilation
- FPG:
-
Formamidopyrimidine DNA glycosylase
- FRHI:
-
Framingham reactive hyperemia index
- GGT:
-
Gamma-glutamyltransferase
- GSH:
-
Reduced glutathione
- GSH-Px:
-
Glutathione peroxidase
- GSSG:
-
Oxidized glutathione
- GST:
-
Glutathione S-transferase
- HDL-C:
-
High-density lipoprotein cholesterol
- HPLC:
-
High-performance liquid chromatography
- IL-6:
-
Interleukin-6
- LC-DAD-MS/MS:
-
Liquid chromatography/diode array detector/mass spectrometry
- LDL-C:
-
Low-density lipoprotein cholesterol
- LSD:
-
Least significant difference
- BMCs:
-
Blood mononuclear cells
- NO:
-
Nitric oxide
- PAT:
-
Peripheral arterial tone
- PBS:
-
Phosphate-buffered saline
- PL:
-
Placebo
- RH:
-
Reactive hyperemia
- RHI:
-
Reactive hyperemia index
- SD:
-
Standard deviation
- SOD:
-
Superoxide dismutase
- SPE:
-
Solid-phase extraction
- sVCAM-1:
-
Soluble vascular adhesion molecule-1
- TNF-α:
-
Tumor necrosis factor alpha
- TFA:
-
Trifluoroacetic acid
- TG:
-
Triglycerides
- TSC:
-
Total serum cholesterol
- UHPLC-MS/MS:
-
Ultra-high-pressure liquid chromatography/mass spectrometry
- WB:
-
Wild blueberry
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Acknowledgments
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.
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The authors declare that they have no conflict of interest.
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Riso, P., Klimis-Zacas, D., Del Bo’, C. et al. Effect of a wild blueberry (Vaccinium angustifolium) drink intervention on markers of oxidative stress, inflammation and endothelial function in humans with cardiovascular risk factors. Eur J Nutr 52, 949–961 (2013). https://doi.org/10.1007/s00394-012-0402-9
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DOI: https://doi.org/10.1007/s00394-012-0402-9
Keywords
- Wild blueberry
- Endothelial function
- DNA damage
- Blood lipids
- Cardiovascular risk