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01-02-2013 | Original Contribution

Polyphenol-rich cranberry juice has a neutral effect on endothelial function but decreases the fraction of osteocalcin-expressing endothelial progenitor cells

Authors: Andreas J. Flammer, Elizabeth A. Martin, Mario Gössl, R. Jay Widmer, Ryan J. Lennon, Jasmine A. Sexton, Darrell Loeffler, Sundeep Khosla, Lilach O. Lerman, Amir Lerman

Published in: European Journal of Nutrition | Issue 1/2013

Abstract

Purpose

Cranberry juice (CJ) contains a remarkably high concentration of polyphenols, considered to be beneficial for cardiovascular and bone health. The current double-blind, randomized study was designed to test whether daily consumption of double-strength Ocean Spray light CJ (2 × 230 ml) over 4 months has beneficial effects on vascular function and on endothelial progenitor cells (EPCs) carrying the osteoblastic marker osteocalcin in particular.

Methods

A total of 84 participants (49.5 ± 16.2 years) with peripheral endothelial dysfunction and cardiovascular risk factors were enrolled in this double-blind, randomized, controlled trial (69 completed the 4-month protocol—32 in the CJ group and 37 in the placebo group, respectively). Vascular responses to reactive hyperemia were measured non-invasively by peripheral arterial tonometry (EndoPAT). Peripheral blood mononuclear cells were stained for EPC markers, as well as osteocalcin, and counted by flow cytometry.

Results

Baseline characteristics were similar in both groups. The effect of CJ on peripheral endothelial function and on circulating EPC counts (CD34⁺/CD133⁺/KDR⁺) did not change during the study. A high percentage of EPCs expressed osteocalcin (59.4 ± 35.7%). CJ, as compared to placebo, induced a decrease in the fraction of EPCs expressing osteocalcin (−8.64 ± 48.98 and 19.13 ± 46.11%, respectively, p = 0.019). Systemic levels of the adhesion marker ICAM correlated significantly with the number of EPCs expressing osteocalcin.

Conclusions

The study demonstrated that long-term supplementation of polyphenol-rich CJ did not improve peripheral endothelial function. However, the decrease in the fraction of osteocalcin+ EPCs suggests a potential beneficial effect of polyphenol-rich CJ.

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Title: Polyphenol-rich cranberry juice has a neutral effect on endothelial function but decreases the fraction of osteocalcin-expressing endothelial progenitor cells
Authors: Andreas J. Flammer
Elizabeth A. Martin
Mario Gössl
R. Jay Widmer
Ryan J. Lennon
Jasmine A. Sexton
Darrell Loeffler
Sundeep Khosla
Lilach O. Lerman
Amir Lerman
Publication date: 01-02-2013
Publisher: Springer-Verlag
Published in: European Journal of Nutrition / Issue 1/2013
Print ISSN: 1436-6207
Electronic ISSN: 1436-6215
DOI: https://doi.org/10.1007/s00394-012-0334-4

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Results

Conclusions

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