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Title: Gallic acid antagonizes P-selectin-mediated platelet-leukocyte interactions: implications for the French paradox
Authors: Appeldoorn, Chantal C M
Bonnefoy, Arnaud
Lutters, Bianca C H
Daenens, Kim
van Berkel, Theo J C
Hoylaerts, Marc ×
Biessen, Erik A L #
Issue Date: Jan-2005
Publisher: American Heart Association
Series Title: Circulation vol:111 issue:1 pages:106-112
Abstract: BACKGROUND: Current paradigm attributes the low incidence of cardiovascular disorders in Mediterranean countries despite a high saturated fat intake, the "French paradox," to the antioxidant capacity of red wine polyphenols. Conceivably, other antiinflammatory pathways may contribute to at least a similar extent to the atheroprotective activity of these polyphenols. We have investigated whether gallic acid (GA), an abundant red wine polyphenol, modulates the activity of P-selectin, an adhesion molecule that is critically involved in the recruitment of inflammatory cells to the vessel wall and thus in atherosclerosis. METHODS AND RESULTS: GA potently inhibited the binding of a peptide antagonist (IC50, 7.2 micromol/L) and biotin-PAA-Le(a)-SO3H, an established high-affinity ligand, to P-selectin (IC50, 85 micromol/L). Under dynamic flow conditions, GA markedly and dose dependently attenuated the rolling of monocytic HL60 cells over P-selectin-transfected Chinese hamster ovary cells (EC50, 14.5 micromol/L) while increasing the velocity of P-selectin-dependent rolling of human blood leukocytes over a platelet monolayer. In vivo tests established that GA administration to normolipidemic C57/Bl6 and aged atherosclerotic apolipoprotein E-deficient mice impaired the baseline rolling of conjugates between activated platelets and circulating monocytes over femoral vein endothelium, as judged by online video microscopy (ED50, 1.7+/-0.3 and 1.5+/-0.4 mg x kg(-1) x h(-1), respectively). CONCLUSIONS: Our findings provide a solid mechanistic foundation through which GA intervenes in major inflammatory pathobiologies by binding and antagonizing P-selectin.
URI: 
ISSN: 0009-7322
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular and Vascular Biology
× corresponding author
# (joint) last author

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