【摘要】 目的观察银杏内酯对小鼠耐缺氧能力以及对大鼠心肌缺血损伤的影响。方法按文献方法制备小鼠耐缺氧模型,观察小鼠常压密闭条件下的存活时间。用大剂量异丙肾上腺素(8mg/kg)造成大鼠心肌缺血性损伤模型,注射异丙肾上腺素前连续4d灌胃给予银杏内酯(10、20、40mg/kg)、银杏叶提取物(EGb,300mg/kg)、普萘洛尔(5mg/kg)或溶媒,比较各组大鼠心肌组织学变化、血清磷酸肌酸激酶(CPK)、乳酸脱氢酶(LDH)活性及心肌超氧化物岐化酶(SOD)、丙二醛(MDA)含量。结果银杏内酯明显延长小鼠在缺氧条件下的存活时间,显著减轻异丙肾上腺素所致大鼠心肌组织损伤,抑制损伤大鼠血清CPK、LDH活性及心肌组织中MDA含量的升高,提高大鼠心肌组织中SOD的活性。结论银杏内酯能提高小鼠的耐缺氧能力,保护大鼠心肌缺血损伤,该作用可能与抗血小板活化因子及氧自由基有关。更多还原

【Abstract】 Objective To observe the effects of ginkgolides on hypoxia tolerance in mice and on myocardial ischemia injury in rats.Methods The mice were given isoprenaline 20 mg/kg(ip) and the survival time of the mice model under the hypoxic condition was recorded. Rat myocardial ischemia was induced by subcutaneous injection of over- dosage isoprenaline(8 mg/kg). Before modeling, rats were pretreated with ginkgolides 10, 20, 40 mg/kg, of ginkgo biloba( EGb) Extract 300 mg/kg, Propranolol 5 mg/kg,or vehicle for four days. The histological changes of myocardiim, serum creatine phosphokinase (CPK) level and lactate dehydrogenase (LDH) activity, myocardial lactate dehydrogenase(LDH) and superoxide dismutase (SOD) content were detected.Results Ginkgolides could prolong the survival time in the mice under a hypoxic condition, lessen the isoprenaline- induced rat myocardial ischemia, inhibit the activities of serum CPK and LDH and the increase of MDA content in ischemic myocardial tissue, enhance superoxide dismutase (SOD) activity. Conclusion Ginkgolides enhance to hypoxia the tolerance in mice and prevent rats from myocardial ischemic injury. The protective mechanism may be related to its inhibition of the activity of platelet activating factor and oxygen free radical. 更多还原