基础医学与临床 ›› 2012, Vol. 32 ›› Issue (12): 1384-1388.

• 研究论文 • 上一篇    下一篇

α-亚麻酸减轻糖尿病大鼠心肌缺血/再灌注损伤

田菲1,张薇2,周和平3,刘楠楠1,于军1,陈宝莹4,张海锋1   

  1. 1. 第四军医大学基础医学院基础医学教学实验中心
    2. 第四军医大学唐都医院心内科
    3. 第四军医大学西京医院心外科
    4. 第四军医大学唐都医院
  • 收稿日期:2011-12-06 修回日期:2012-04-05 出版日期:2012-12-05 发布日期:2012-11-28
  • 通讯作者: 张海锋 E-mail:hfzhang@fmmu.edu.cn
  • 基金资助:
    骨髓间充质干细胞瘤化中STAT3信号通路过度激活的作用机制与规避研究;骨髓间充质干细胞瘤化中STAT3信号通路过度激活的作用机制与规避研究;骨髓间充质干细胞瘤化中STAT3信号通路过度激活的作用机制与规避研究;骨髓间充质干细胞瘤化中STAT3信号通路过度激活的作用机制与规避研究

Alpha-linolenic acid intake attenuates myocardial ischemia/reperfusion injury in diabetic rats

  • Received:2011-12-06 Revised:2012-04-05 Online:2012-12-05 Published:2012-11-28
  • Contact: Haifeng Zhang E-mail:hfzhang@fmmu.edu.cn

摘要: 目的 研究摄食?-亚麻酸(ALA)对糖尿病大鼠心肌缺血/再灌注(MI/R)损伤的影响。方法 构建高脂饲料-链脲霉素诱导的2型糖尿病大鼠模型(HFD-STZ),每日灌胃给予正常或HFD-STZ大鼠ALA处理(500 μg/kg),4周后行心肌缺血(30 min)/再灌注(4或6 h),并检测心肌梗死范围、血清肌酸激酶(CK)、乳酸脱氢酶(LDH)活性、细胞凋亡,用Western blot检测PI3K、Akt等。结果 HFD-STZ大鼠MI/R损伤加重,虽摄食ALA 4周对正常动物MI/R损伤无影响,但可将HFD-STZ大鼠的心梗面积减小至37.7% ± 5.4%,显著低于对照组的45.6% ± 8.5%(P < 0.05),且血清CK、LDH活性及细胞凋亡减少;还可增加HFD-STZ大鼠心肌PI3K表达及Akt磷酸化。结论 长期摄食ALA有效减轻糖尿病大鼠MI/R损伤,可能与激活PI3K-Akt信号有关。

关键词: α-亚麻酸, 糖尿病, 心肌缺血/再灌注损伤

Abstract: Objectives to investigate the effects of Alpha-linolenic acid (ALA) intake on myocardial ischemia/reperfusion (MI/R) injury in diabetic rats. Methods The high-fat diet-fed streptozotocin (HFD-STZ) rat model was developed. Age-mathched normal and HFD-STZ rats were randomly assigned to receive non-ALA diet or ALA (o.g., 500 μg/kg per day). After 4 wks of feeding animals were subjected to 30 min of myocardial ischemia and 4 or 6 hrs of reperfusion. Results HFD-STZ rats showed more severe myocardial injury. Although ALA intake for 4 wks did not change myocardial injury in normal rats, it significantly reduced infarct size, plasma creatine kinase and lactate dehydrogenase activities, and apotosis in HFD-STZ diabetic rats. Moreover, myocardial PI3K expression and Akt phosphorylation were increased by ALA intake in diabetic but not normal rats. Conclusion Chronic ALA intake confers cardioprotection in MI/R in diabetic but not normal rats, which is possibly through PI3K-Akt-dependent mechanism.

Key words: Alpha-linolenic acid, Diabetes, Myocardial ischemia/reperfusion injury

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