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Original Research Communications |
1 From the Lipid Research Laboratory and the Division of Morphological Sciences, Technion Faculty of Medicine, The Rappaport Family Institute for Research in the Medical Sciences and Rambam Medical Center, Haifa, Israel.
Background: Dietary supplementation with nutrients rich in antioxidants is associated with inhibition of atherogenic modifications to LDL, macrophage foam cell formation, and atherosclerosis. Pomegranates are a source of polyphenols and other antioxidants.
Objective: We analyzed, in healthy male volunteers and in atherosclerotic apolipoprotein E–deficient (E0) mice, the effect of pomegranate juice consumption on lipoprotein oxidation, aggregation, and retention; macrophage atherogenicity; platelet aggregation; and atherosclerosis.
Design: Potent antioxidative effects of pomegranate juice against lipid peroxidation in whole plasma and in isolated lipoproteins (HDL and LDL) were assessed in humans and in E0 mice after pomegranate juice consumption for 
2 and 14 wk, respectively.
Results: In humans, pomegranate juice consumption decreased LDL susceptibility to aggregation and retention and increased the activity of serum paraoxonase (an HDL-associated esterase that can protect against lipid peroxidation) by 20%. In E0 mice, oxidation of LDL by peritoneal macrophages was reduced by up to 90% after pomegranate juice consumption and this effect was associated with reduced cellular lipid peroxidation and superoxide release. The uptake of oxidized LDL and native LDL by mouse peritoneal macrophages obtained after pomegranate juice administration was reduced by 20%. Finally, pomegranate juice supplementation of E0 mice reduced the size of their atherosclerotic lesions by 44% and also the number of foam cells compared with control E0 mice supplemented with water.
Conclusion: Pomegranate juice had potent antiatherogenic effects in healthy humans and in atherosclerotic mice that may be attributable to its antioxidative properties.
Key Words: Pomegranate juice • flavonoids • lipid peroxidation • LDL • HDL macrophage • paraoxonase • platelet • atherosclerosis • antioxidants • men • atherosclerotic apolipoprotein E–deficient mice
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