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


Flammer, A J; Martin, E A; Gossl, M; Widmer, R J; Lennon, R J; Sexton, J A; Loeffler, D; Khosla, S; Lerman, L O; Lerman, A (2013). Polyphenol-rich cranberry juice has a neutral effect on endothelial function but decreases the fraction of osteocalcin-expressing endothelial progenitor cells. European Journal of Nutrition, 52(1):289-296.

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 x 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.

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 x 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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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Cardiology
Dewey Decimal Classification:610 Medicine & health
Uncontrolled Keywords:Adult Aged Beverages/*analysis Biological Markers/blood C-Reactive Protein/analysis/metabolism Cardiovascular Diseases/prevention & control Double-Blind Method Endothelial Cells/cytology/*drug effects/metabolism Female Flow Cytometry Humans Intercellular Adhesion Molecule-1/blood Interleukin-6/blood Leukocytes, Mononuclear/cytology/drug effects/metabolism Lipoproteins, LDL/blood Male Middle Aged Osteocalcin/genetics/*metabolism Polyphenols/*administration & dosage Risk Factors Stem Cells/cytology/*drug effects/metabolism Tumor Necrosis Factor-alpha/blood Vaccinium macrocarpon/*chemistry Vascular Cell Adhesion Molecule-1/blood
Language:English
Date:2013
Deposited On:01 Nov 2013 07:36
Last Modified:05 Apr 2016 17:05
Publisher:Springer
ISSN:1436-6207
Publisher DOI:https://doi.org/10.1007/s00394-012-0334-4
PubMed ID:22382203

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