title: Myocardial protective effect of honokiol: an active component in Magnolia officinalis.
abstract: Honokiol is an active component of Magnolia officinalis. It was reported to be 1000 times more potent than alpha-tocopherol in inhibiting lipid peroxidation in rat heart mitochondria. In this study, we investigated the in vivo antiarrhythmic and antiischemic effects of honokiol in coronary ligated rats. Male Sprague-Dawley rats were anesthetized with urethane. Honokiol, at dosages of 10(-7) g/kg, 10(-8) g/kg, and 10(-9) g/kg, was administered intravenously 15 min before ligation of the coronary artery. Incidence and duration of ventricular tachycardia and ventricular fibrillation during 30 min coronary ligation were significantly reduced by 10(-7) g/kg honokiol. Ventricular arrhythmia during 10 min reperfusion after the relief of coronary ligation was also reduced. In rats subjected to 4 hours coronary ligation, 10(-7) g/kg, 10(-8) g/kg, and 10(-9) g/kg honokiol significantly reduced the infarct zone. We concluded that honokiol may protect the myocardium against ischemic injury and suppress ventricular arrhythmia during ischemia and reperfusion.
authors.affiliation: Department of Anesthesiology, Taipei Veterans General Hospital, Taiwan.
authors.forename: S K
authors.initials: SK
authors.lastname: Tsai
authors.forename: S S
authors.initials: SS
authors.lastname: Huang
authors.forename: C Y
authors.initials: CY
authors.lastname: Hong
mesh_terms: D000818:Animals; D000889:Anti-Arrhythmia Agents / Q000494:pharmacology*; D001713:Biphenyl Compounds / Q000494:pharmacology*; D004365:Drugs, Chinese Herbal / Q000494:pharmacology*; D006321:Heart / Q000187:drug effects*; D017705:Lignans; D008297:Male; D009203:Myocardial Infarction / Q000188:drug therapy; D051381:Rats; D017207:Rats, Sprague-Dawley; D000498:Allyl Compounds; D010636:Phenols
chemical_list: D000889:Anti-Arrhythmia Agents; D001713:Biphenyl Compounds; D004365:Drugs, Chinese Herbal; D017705:Lignans; C005499:honokiol; D000498:Allyl Compounds; D010636:Phenols