title: SB 211475, a metabolite of carvedilol, a novel antihypertensive agent, is a potent antioxidant.
abstract: The antioxidant effects of SB 211475, a metabolite of carvedilol, a novel antihypertensive agent, were studied and compared with carvedilol and other antioxidants such as U78517F, U74500A and probucol. SB 211475 inhibited Fe(2+)-vitamin C-initiated lipid peroxidation, assessed as thiobarbituric acid reactive substance, in brain-homogenate with an IC50 of 0.28 microM. Under the same conditions, the IC50s of probucol, carvedilol, U74500A and U78517F were 50, 8.1, 0.71 and 0.16 microM, respectively. SB 211475 inhibited oxidation of human low density lipoprotein by mouse macrophages with an IC50 of 0.043 microM. In the same model, the IC50s of carvedilol, U78517F and probucol were 3.8, 0.15, and 0.80 microM, respectively. SB 211475 protected cultured bovine pulmonary artery endothelial cells against hydroxyl radical-initiated lipid peroxidation (IC50 = 0.15 microM) and cell damage (lactate dehydrogenase release, IC50 = 0.16 microM), and promoted cell survival with an EC50 of 0.13 microM. SB 211475 also protected endothelial cells against xanthine/xanthine oxidase-initiated cytotoxicity and protected rat cerebellar neurons from hydroxyl radical-mediated cell death (EC50 = 0.19 microM). Moreover, SB 211475 inhibited superoxide (O2-) release from human neutrophils stimulated by phorbol myristate acetate. These observations indicate that SB 211475 is a potent antioxidant and may potentially contribute to the therapeutic effects of carvedilol in vivo.
authors.affiliation: Department of Cardiovascular Pharmacology, SmithKline Beecham Pharmaceuticals, King of Prussia, PA 19406-0939.
authors.forename: T L
authors.initials: TL
authors.lastname: Yue
authors.forename: P J
authors.initials: PJ
authors.lastname: Mckenna
authors.forename: P G
authors.initials: PG
authors.lastname: Lysko
authors.forename: J L
authors.initials: JL
authors.lastname: Gu
authors.forename: K A
authors.initials: KA
authors.lastname: Lysko
authors.forename: R R
authors.initials: RR
authors.lastname: Ruffolo
authors.forename: G Z
authors.initials: GZ
authors.lastname: Feuerstein
mesh_terms: D000244:Adenosine Diphosphate / Q000633:toxicity; D000818:Animals; D000959:Antihypertensive Agents / Q000494:pharmacology*; D000975:Antioxidants / Q000494:pharmacology*; D001205:Ascorbic Acid / Q000037:antagonists & inhibitors / Q000494:pharmacology; D001921:Brain / Q000187:drug effects / Q000378:metabolism; D002227:Carbazoles / Q000494:pharmacology*; D002417:Cattle; D016923:Cell Death / Q000187:drug effects; D002478:Cells, Cultured; D002839:Chromans / Q000494:pharmacology; D004730:Endothelium, Vascular / Q000187:drug effects / Q000378:metabolism; D005650:Fumarates / Q000633:toxicity; D006801:Humans; D007501:Iron / Q000037:antagonists & inhibitors / Q000494:pharmacology / Q000633:toxicity; D015227:Lipid Peroxidation / Q000187:drug effects; D008077:Lipoproteins, LDL / Q000378:metabolism; D008264:Macrophages / Q000187:drug effects / Q000378:metabolism; D008297:Male; D051379:Mice; D009474:Neurons / Q000166:cytology / Q000187:drug effects; D009504:Neutrophils / Q000187:drug effects / Q000378:metabolism; D009529:Nicardipine / Q000494:pharmacology; D010084:Oxidation-Reduction; D010879:Piperazines / Q000494:pharmacology; D011412:Propanolamines / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D017382:Reactive Oxygen Species / Q000494:pharmacology; D013481:Superoxides / Q000378:metabolism / Q000494:pharmacology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D019820:Xanthine; D014969:Xanthine Oxidase / Q000633:toxicity; D014970:Xanthines / Q000633:toxicity
chemical_list: D000959:Antihypertensive Agents; D000975:Antioxidants; D002227:Carbazoles; D002839:Chromans; D005650:Fumarates; D008077:Lipoproteins, LDL; D010879:Piperazines; D011412:Propanolamines; D017382:Reactive Oxygen Species; D014970:Xanthines; D013481:Superoxides; C005998:dihydroxyfumarate; C066382:U 78517F; C086740:SB 211475; D019820:Xanthine; D000244:Adenosine Diphosphate; D009529:Nicardipine; D007501:Iron; D014969:Xanthine Oxidase; D013755:Tetradecanoylphorbol Acetate; D001205:Ascorbic Acid