© 1995 American Heart Association, Inc.
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Platelet Rebound Effect of Alcohol Withdrawal and Wine Drinking in Rats
Relation to Tannins and Lipid Peroxidation
From the INSERM, Unit 63, Lyon-Bron (J.-C.R., S.R.), and SICAREX, Villefranche/Saône, (J.-L.B.), France.
Correspondence to Serge C. Renaud, INSERM, Unit 63, 22, Ave Doyen Lépine, Case 18, 69675 Bron Cedex, France.
Abstract We investigated in rats fed a purified diet for 2 and 4 months whether wine drinking was associated with the rebound effect on thrombin-induced platelet aggregation observed after alcohol withdrawal. With 6% ethanol drinking or its equivalent in red or white wine, platelet aggregation was reduced similarly by 70% when the animals drank the alcoholic beverages up to the venipuncture. Depriving the rats of alcoholic beverages for 18 hours was associated with an increase in the platelet response of 124% in those receiving 6% ethanol, of 46% with white wine but a decrease of 59% in those with red wine. The protective effect of red wine on platelets could be reproduced by tannins (procyanidins) extracted from grape seeds or red wine and added to 6% ethanol, but not by glycerol or wine without alcohol. That was related to inhibition of the alcohol-induced lipid peroxidation as shown by the lowering of conjugated dienes, lipid peroxides, and the increase in vitamin E in plasma. Owing to tannins, the platelets of rats drinking red wine did not exhibit the rebound effect observed hours after alcohol drinking, eventually associated with sudden death and stroke in humans.
Key Words: alcohol • lipid peroxidation • platelet aggregation • tannins • wine
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