title: Trans-resveratrol alone and hydroxystilbenes of rhubarb (Rheum rhaponticum L.) root reduce liver damage induced by chronic ethanol administration: a comparative study in mice.
abstract: The hepatoprotective effects and pharmacokinetics of trans-resveratrol and hydroxystilbenes of the garden rhubarb (Rheum rhaponticum L., R. rhaponticum) root ethanol extract were studied. Ethanol was administered to male BALB/c mice for 35 days in an inhalation chamber. During this time vehicle, trans-resveratrol (20 mg/kg per day) or R. rhaponticum extract was intraperitoneally (i.p.) administered and mice were sacrificed for the collection of liver and blood. In an additional experiment, the level of parent compounds and metabolites was estimated in the blood after acute i.p. administration of trans-resveratrol or R. rhaponticum extract. The levels of hydroxystilbenes, their metabolites and fatty acid oxy-metabolites (oxylipins) were studied by LC-tandem DAD-MS/MS. Ethanol induced hepatotoxicity, as evidenced by histological changes and accumulation of oxylipins in the blood. Both trans-resveratrol and R. rhaponticum extract reduced the extent of these changes. The pharmacokinetics of trans-resveratrol was characterized by a rapid removal from the blood and metabolism to sulfates and glucuronides. After the administration of R. rhaponticum extract, in addition to trans-resveratrol glucoside and its metabolites, several other hydroxystilbenes were found. Inhibition of oxidation of polyunsaturated fatty acids is proposed as a basis of the hepatoprotective effect of both trans-resveratrol and R. rhaponticum extract.
authors.affiliation: Department of Pharmacy, University of Tartu, Tartu, Estonia.
authors.forename: Ain
authors.initials: A
authors.lastname: Raal
authors.forename: Paavo
authors.initials: P
authors.lastname: Pokk
authors.forename: Andres
authors.initials: A
authors.lastname: Arend
authors.forename: Marina
authors.initials: M
authors.lastname: Aunapuu
authors.forename: Janne
authors.initials: J
authors.lastname: Jõgi
authors.forename: Kai
authors.initials: K
authors.lastname: Okva
authors.forename: Tõnu
authors.initials: T
authors.lastname: Püssa
mesh_terms: D000818:Animals; D056486:Chemical and Drug Induced Liver Injury; D000431:Ethanol / Q000009:adverse effects*; D005231:Fatty Acids, Unsaturated / Q000097:blood; D050356:Lipid Metabolism; D008099:Liver / Q000187:drug effects* / Q000473:pathology; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D010084:Oxidation-Reduction; D010936:Plant Extracts / Q000494:pharmacology; D018517:Plant Roots / Q000737:chemistry; D000077185:Resveratrol; D012250:Rheum / Q000737:chemistry*; D013267:Stilbenes / Q000097:blood / Q000493:pharmacokinetics / Q000494:pharmacology*
chemical_list: D005231:Fatty Acids, Unsaturated; D010936:Plant Extracts; D013267:Stilbenes; D000431:Ethanol; D000077185:Resveratrol