title: In vitro evidence for the formation of reactive intermediates of resveratrol in human liver microsomes.
abstract: Resveratrol (3,4',5-trihydroxystilbene) is a naturally occurring polyphenolic compound found in a variety of foods and over-the-counter health products. It has gained wide public use due to its potential health properties, and is available over-the-counter at health product stores. Although the safety profile of resveratrol has been minimally investigated in humans, resveratrol has been associated with observations of toxicity in vitro, and has been identified as a mechanism-based inhibitor of cytochrome P450 3A4. In addition, resveratrol has been rationally hypothesized to form reactive quinone methide metabolites, despite experimental evidence supporting this assumption. This work evaluates the potential for resveratrol to form glutathione-trapped reactive intermediates in human liver microsomes utilizing liquid chromatography and electrospray tandem mass spectrometry, and has resulted in the identification of several in vitro products including two hydroxylated metabolites (piceatannol and metabolite 2), and two pairs of regioisomeric glutathione adducts. The parallel metabolism of resveratrol to piceatannol and metabolite 2 (a putative quinone methide) are demonstrated to result in the formation of two putative quinone methide intermediates resulting in divergent mechanisms for formation of each pair of regioisomeric glutathione adducts.
authors.affiliation: Pfizer Global Research and Development, Groton, CT 06340, USA. rick.c.steenwyk@pfizer.com
authors.forename: R C
authors.initials: RC
authors.lastname: Steenwyk
authors.forename: B
authors.initials: B
authors.lastname: Tan
mesh_terms: D000975:Antioxidants / Q000494:pharmacology; D002374:Catalase / Q000494:pharmacology; D002851:Chromatography, High Pressure Liquid; D004851:Epoxide Hydrolases / Q000494:pharmacology; D016166:Free Radical Scavengers / Q000494:pharmacology; D005978:Glutathione / Q000378:metabolism; D006801:Humans; D045563:Indolequinones / Q000378:metabolism; D053858:Metabolic Networks and Pathways / Q000187:drug effects / Q000502:physiology; D008862:Microsomes, Liver / Q000187:drug effects / Q000378:metabolism*; D000077185:Resveratrol; D021241:Spectrometry, Mass, Electrospray Ionization; D013267:Stilbenes / Q000737:chemistry / Q000378:metabolism / Q000493:pharmacokinetics* / Q000633:toxicity; D013482:Superoxide Dismutase / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D016166:Free Radical Scavengers; D045563:Indolequinones; D013267:Stilbenes; C068040:quinone methide; C041525:3,3',4,5'-tetrahydroxystilbene; D002374:Catalase; D013482:Superoxide Dismutase; D004851:Epoxide Hydrolases; D005978:Glutathione; D000077185:Resveratrol