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• W2060348573 abstract "Dexrazoxane is an antioxidant prodrug that on hydrolysis is converted into an intracellular iron chelator. We hypothesized that the antioxidant effects of dexrazoxane would prevent homocysteine-induced endothelial dysfunction in the brachial artery of normal human subjects.Ten healthy volunteers completed a randomized, double-blind, crossover study. Plasma homocysteine levels and brachial artery endothelium-dependent (flow-mediated dilation [FMD]) and endothelium-independent (sublingual nitroglycerin) responses were measured before and 4 hours after ingestion of L-methionine (100 mg/kg), preceded by intravenous administration of dexrazoxane (500 mg/m2) or placebo over 30 minutes. After placebo, oral methionine increased plasma homocysteine (from 5.1+/-0.4 micromol/L at baseline to 14.2+/-1.3 micromol/L at 4 hours, P<0.001) and decreased FMD (from 3.8+/-0.7% at baseline to 1.2+/-0.5% at 4 hours, P=0.02). Dexrazoxane did not change homocysteine concentrations after methionine administration (14.9+/-1.1 micromol/L at 4 hours, P=0.29 versus placebo) but did completely abrogate the homocysteine-induced reduction in FMD (from 3.5+/-0.5% at baseline to 5.9+/-1.1% at 4 hours, P<0.01 versus placebo). Endothelium-independent responses to sublingual nitroglycerin did not differ after the administration of placebo and dexrazoxane.Administration of the novel antioxidant agent dexrazoxane prevents homocysteine-induced impairment of vascular endothelial function in the brachial artery of healthy subjects." @default.
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• W2060348573 date "2002-07-01" @default.
• W2060348573 modified "2023-09-24" @default.
• W2060348573 title "Effect of Dexrazoxane on Homocysteine-Induced Endothelial Dysfunction in Normal Subjects" @default.
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• W2060348573 doi "https://doi.org/10.1161/01.atv.0000023187.25914.5b" @default.
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