麦冬多糖中抗急性心肌缺血活性部位研究

目的:筛选麦冬多糖中抗心肌缺血的活性部位,明确其抗心肌缺血作用.方法:以异丙肾上腺素造成大鼠心肌坏死程度为评价指标,筛选麦冬多糖中不同分子量的组分,通过垂体后叶素诱发大鼠冠状动脉痉挛实验以及冠状动脉结扎致大鼠急性心肌缺血实验,证明了麦冬活性多糖的抗心肌缺血作用.结果:麦冬活性多糖可拮抗垂体后叶素引起的S-T段抬高,可使结扎大鼠冠脉后升高的S-T段明显降低,同时降低动物血清中CK和LDH含量升高,对心肌缺血造成的SOD降低和MDA增加有一定的抑制作用.结论:麦冬活性多糖可保护心肌细胞,同时具有抑制心肌缺血造成的自由基生成增加和清除氧自由基的作用.

Active components of Polysaccharide of Ophiopogon Japonicus on acute myocardial ischemia

AIM: To choose the anti myocardial ischemic ingredients from polysaccharide of Ophiopogon Japonicus(PO), then to confirm their effects. METHODS: According to molecular weight, PO was separated to three portions by using ultrafiltration technique. The effects of each separated portion on myocardial ischemia induced by isoproterenol were studied. Then the effects of PO active portions (POAP) on the convulsion of coronary artery induced by pituitrin and acute myocardial ischemia caused by the ligation of coronary artery were further studied in rats. RESULTS: POAP could resist the elevation of Tand S T phase induced by pituitrin in rats, remarkably decrease the elevated S T phase and contents of CK and LDH in serum caused by the ligation of rat coronary artery. POAP also exerted some inhibition effects on the reduction of SOD and increase of MDA caused by myocardial ischemia. CONCLUSION: POAP can protect myocardial cells, inhibit the generation of free radicals, and scavenge the oxygen free radicals generated from myocardial ischemia.