title: Effect of Robola and Cabernet Sauvignon extracts on platelet activating factor enzymes activity on U937 cells.
abstract: A number of studies support the anti-atherogenic effect of wine compounds. The scope of this study was to examine the effect of a red (Cabernet Sauvignon-CS) and a white (Robola-R) wine, as well as resveratrol and quercetin, on the platelet activating factor (PAF) biosynthetic enzymes, acetyl-CoA:lyso-PAF acetyltransferase (lyso-PAF-AT) and DTT-insensitive CDP-choline 1-alkyl-2-acetyl-sn-glycerol cholinephosphotransferase (PAF-CPT), and its main catabolic enzyme (PAF acetylhydrolase; PAF-AH), on U937 cells, in cell free and in intact cell experiments. In cell free experiments, phenolic compounds and wine extracts inhibited PAF biosynthetic enzymes, however in higher concentrations than intact cell experiments. In the latter cases, polar lipids of both wines inhibited in the same order of magnitude the action of lyso-PAF-AT and of PAF-CPT. The water fractions possessed a dual action, in lower concentrations they activated both enzymes, while in higher concentrations only inhibited PAF-CPT. All fractions either did not affect or slightly activated PAF-AH activity. In conclusion, wine compounds may exert their anti-inflammatory activity by reducing PAF levels through modulation of the PAF metabolic enzymes.
authors.affiliation: Department of Nutrition and Dietetics, Harokopio University, Athens, Greece.
authors.forename: M N
authors.initials: MN
authors.lastname: Xanthopoulou
authors.affiliation: Department of Nutrition and Dietetics, Harokopio University, Athens, Greece.
authors.forename: D
authors.initials: D
authors.lastname: Asimakopoulos
authors.affiliation: Department of Nutrition and Dietetics, Harokopio University, Athens, Greece.
authors.forename: S
authors.initials: S
authors.lastname: Antonopoulou
authors.affiliation: Faculty of Chemistry, National and Kapodistrian University of Athens, Greece.
authors.forename: C A
authors.initials: CA
authors.lastname: Demopoulos
authors.affiliation: Department of Nutrition and Dietetics, Harokopio University, Athens, Greece. Electronic address: efragop@hua.gr.
authors.forename: E
authors.initials: E
authors.lastname: Fragopoulou
mesh_terms: D050197:Atherosclerosis / Q000188:drug therapy*; D006801:Humans; D010972:Platelet Activating Factor / Q000378:metabolism*; D000077185:Resveratrol; D013267:Stilbenes / Q000737:chemistry*; D020298:U937 Cells; D014920:Wine / Q000032:analysis*
chemical_list: D010972:Platelet Activating Factor; D013267:Stilbenes; D000077185:Resveratrol
keywords: Atherosclerosis; Platelet activating factor metabolism; Quercetin; Resveratrol; Wine