European Journal of Nutrition

, Volume 52, Issue 1, pp 289–296 | Cite as

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

  • 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
Original Contribution

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.

Keywords

Endothelial function Cranberry Polyphenols Endothelial progenitor cells Osteocalcin 

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Andreas J. Flammer
    • 1
  • Elizabeth A. Martin
    • 1
  • Mario Gössl
    • 1
  • R. Jay Widmer
    • 1
  • Ryan J. Lennon
    • 2
  • Jasmine A. Sexton
    • 1
  • Darrell Loeffler
    • 1
  • Sundeep Khosla
    • 3
  • Lilach O. Lerman
    • 4
  • Amir Lerman
    • 1
  1. 1.Division of Cardiovascular DiseasesMayo Clinic and College of MedicineRochesterUSA
  2. 2.Biomedical StatisticsMayo Clinic and College of MedicineRochesterUSA
  3. 3.Endocrine Research UnitMayo Clinic and College of MedicineRochesterUSA
  4. 4.Division of Nephrology and HypertensionMayo Clinic and College of MedicineRochesterUSA

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