title: [Protective effects of orientin on myocardial ischemia and hypoxia in animal models].
abstract: OBJECTIVE
  To study the protective effects of orientin against myocardial ischemia and hypoxia in rats.
  
  
  METHODS
  The protective effect of orientin against myocardial ischemia and hypoxia was observed in mice by recording their survival time under closed normobaric hypoxia and time of cardiac electric disappearance due to trachea clamping, in rabbits by evaluating arachidonic acid (AA)-induced blood platelet aggregation, in guinea pigs by measuring the coronal flow in the isolated heart and in SD rats with myocardial ischemia induced by pituitrin injection.
  
  
  RESULTS
  Orientin (1, 2, 4 mg/kg) significantly prolonged the survival time of mice under closed normobaric hypoxia and the gasping duration induced by decapitation. Orientin at concentrations of 3, 10, and 30 micromol/L also inhibited AA-induced blood platelet aggregation in rabbits and increased coronal flow in the isolated heart of guinea pigs. At 0.75, 1.5, and 3.0 mg/kg, orientin significantly antagonized pituitrin-induced ECG changes.
  
  
  CONCLUSIONS
  Orientin may offer protection against myocardial ischemia and hypoxia in animal models in dose-dependent fashions.
authors: Guangdong Vocational and Technical College of Chemical Engineering Pharmaceutics/Chinese Herbal Medicine Institute of Guangdong Province, Guangzhou 510520, China. fxc1968@163.com
authors: Xiao-Chun
authors: XC
authors: Fu
authors: Xi
authors: X
authors: Wang
authors: Hui
authors: H
authors: Zheng
authors: Li-Ping
authors: LP
authors: Ma
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D004562:Electrocardiography; D005260:Female; D005419:Flavonoids / Q000494:pharmacology*; D005960:Glucosides / Q000494:pharmacology*; D006168:Guinea Pigs; D000860:Hypoxia / Q000503:physiopathology / Q000517:prevention & control*; D008297:Male; D051379:Mice; D017202:Myocardial Ischemia / Q000503:physiopathology / Q000517:prevention & control*; D010974:Platelet Aggregation / Q000187:drug effects; D011817:Rabbits; D051381:Rats; D015996:Survival Rate
chemical_list: D005419:Flavonoids; D005960:Glucosides; C065886:orientin