吉林大学学报(医学版)

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黄芪甲苷对大鼠心肌局部缺血再灌注损伤的改善作用及其对PI3K/Akt/mTOR信号通路的影响

张静1,马翠丽2,王志国3   

  1. 1.吉林大学第二医院药品管理部,吉林 长春130041;2.吉林大学中日联谊医院风湿免疫科,吉林 长春 130033;3.吉林大学南岭校区医院药剂科,吉林 长春130022
  • 收稿日期:2014-02-19 出版日期:2014-09-28 发布日期:2014-11-24
  • 通讯作者: 王志国(Tel:0431-85095519-810,E-mail:1893913119@qq.com) E-mail:1893913119@qq.com
  • 作者简介:张 静(1975-),女,吉林省长春市人,主管药师,医学硕士,主要从事药物开发、剂型及临床应用的研究。
  • 基金资助:

    吉林省发改委专项基金资助课题(2012747)  

Improvement effects of astragaloside Ⅳ on myocardial focalischemia-reperfusion injury and its influence in PI3K/Akt/mTOR signaling pathway

ZHANG Jing1,MA Cui-li2,WANG Zhi-guo3   

  1. 1.Department of Drug Administration,Second Hospital,Jilin University,Changchun 130041,China;2.Department of Rheumatology,China-Japan Union Hospital,Jilin University,Changchun 130033,China;3.Department of Pharmacy,Nanling Campus Hospital,Jilin University,Changchun 130024,China
  • Received:2014-02-19 Online:2014-09-28 Published:2014-11-24

摘要:

目的:观察黄芪甲苷(AS-Ⅳ)对大鼠心肌局部缺血再灌注(I/R)损伤的改善作用及其对PI3K/Akt/mTOR信号通路的影响,阐明AS-Ⅳ对心肌I/R损伤的保护作用及可能机制。方法:选择60只雄性Sprague-Dawley大鼠,采用阻断左冠状动脉前降支血流30 min再灌注120 min的方法制备局部I/R模型,随机分为模型组(等体积生理盐水)、AS-Ⅳ组(于再灌注前5 min静脉注射10  mg/kg AS-Ⅳ)、PI3K抑制剂Wortmannin(WOR)组(于再灌注前10 min静脉注射0.6 mg/kg WOR)和AS-Ⅳ+WOR组(于再灌注前5、10min依次静脉注射10 mg/kg AS-Ⅳ和0.6 mg/kg WOR)。同时选取15只同周龄大鼠作为正常对照(对照组)。分析各组大鼠I/R后的心脏质量、心肌缺血程度和梗死程度及心功能情况[左室收缩期平均压(LVSP)、舒张末期压力(LVEDP)、短轴缩短率(FS)和射血分数(EF)];采用Western blotting法检测心肌梗死区Akt及mTOR磷酸化(p-Akt和p-mTOR)水平,特异性荧光探针DHE染色分析心肌活性氧自由基水平。结果:与对照组比较,模型组大鼠心肌缺血程度、梗死程度、LVEDP、心肌p-Akt/Akt和p-mTOR/mTOR及活性氧自由基水平均升高(P<0.05),LVSP、FS和EF均降低(P<0.05)。与模型组比较,AS-Ⅳ组大鼠心肌缺血程度、梗死程度、LVEDP及活性氧自由基水平均降低(P<0.05),心肌p-Akt/Akt、p-mTOR/mTOR 及LVSP、FS和EF均升高(P<0.05);与AS-Ⅳ组比较,WOR组和AS-Ⅳ+WOR组大鼠心肌缺血程度、梗死程度、LVEDP及活性氧自由基水平均升高(P<0.05),心肌p-Akt/Akt、p-mTOR/mTOR及LVSP、FS和EF均降低(P<0.05)。结论:AS-Ⅳ对心肌I/R损伤有改善作用,可降低心肌梗死及氧化应激程度并提高心功能,其机制可能通过激活PI3K/Akt/mTOR信号通路发挥作用。

关键词: 黄芪甲苷, 心肌缺血再灌注, PI3K/Akt/mTOR信号通路

Abstract:

Abstract:Objective To observe the improvement effects of astragaloside Ⅳ (AS-Ⅳ) on the myocardial focal ischemia-reperfusion (I/R) injury and its influence in PI3K/Akt/mTOR pathway,and to clarify the protective effect of AS-Ⅳ on myocardial I/R injury and the possible mechanisms.Methods The left main coronary arteries of 60 Sprague-Dawley rats  were occluded for 30 min followed by a 120-min reperfusion to induce I/R model.The rats with I/R injury were randomly divided into model group (normal saline),AS-Ⅳ group (intravenous injection of 10 mg/kg AS-Ⅳ 5 min before reperfusion),PI3K inhibitor Wortmannin (WOR) group (intravenous injection of 0.6 mg/kg WOR 10 min before reperfusion) and AS-Ⅳ+WOR group (intravenous injection of   10 mg/kg AS-Ⅳ and 0.6 mg/kg WOR  5 and 10 min before reperfusion,respectively).15 age-matched SD rats were chosen as control group.The heart  mass,degrees of infarction and ischemia and cardiac function ,including left ventricular systolic mean pressure (LVSP),end-diastolic pressure (LVEDP),fractional shortening (FS) and ejection fraction (EF), of the rats in all groups were analyzed.Western blotting method was used to measure the phosphorylation levels of Akt and mTOR(p-Akt and p-mTOR).The specific fluorescent probe DHE staining was employed to detect the myocardial reactive oxygen species levels.Results Compared with control group,the degrees of infarction and ischemia,LVEDP,myocardial levels of p-Akt/Akt,p-mTOR/mTOR and reactive oxygen species levels of the rats were increased (P<0.05). and the levels of LVSP,FS and EF were decreased in model group (P<0.05). Compared with the model group,the degrees of infarction and ischemia,LVEDP and reactive oxygen species level were decreased (P<0.05),while the levels of p-Akt/Akt,p-mTOR/mTOR LVSP,FS and EF of all rats in AS-Ⅳ group were increased (P<0.05).Compared with AS-Ⅳ group,the degrees of infarction and ischemia,LVEDP and reactive oxygen species levels of the rats in   WOR group and AS-Ⅳ+WOR group were increased(P<0.05),and the myocardial  p-Akt/Akt,p-mTOR/mTOR and  LVSP,FS,EF were decreased (P<0.05).Conclusion AS-Ⅳ has improvement effect on myocardial I/R injury.AS-Ⅳ can reduce the extent of myocardial infarction and oxidative stress and improve the heart function,and its possible mechanism may be related to activating PI3K/Akt/mTOR signaling pathway.

Key words: astragaloside Ⅳ, myocardial ischemia-reperfusion injury, PI3K/Akt/mTOR pathway

中图分类号: 

  • R363