基础医学与临床 ›› 2014, Vol. 34 ›› Issue (8): 1023-1026.

• 研究论文 • 上一篇    下一篇

心肌细胞自噬对心力衰竭大鼠心功能的影响

王陵军1,高梦夕2,陈洁2,孙敬和2   

  1. 1. 广州中医药大学第一附属医院,广州中医药大学国家重点学科中医内科学实验室
    2. 广州中医药大学第一附属医院
  • 收稿日期:2013-12-26 修回日期:2014-03-22 出版日期:2014-08-05 发布日期:2014-07-15
  • 通讯作者: 王陵军 E-mail:smu868@163.com
  • 基金资助:
    益气温阳活血法对心衰时线粒体通透性转变介导的心肌细胞自噬的调节作用;益气温阳活血法对心衰AGEs-RAGE 轴介导的心肌细胞自噬的调节作用;益气温阳活血法对慢性心衰时线粒体通透性转变介导的心肌细胞自噬的作用;益气温阳活血法对心衰时MPT介导的心肌细胞自噬的作用

Effect of Autophagic cardiomyocyte death on cardiac function in a rat model of heart failure

  • Received:2013-12-26 Revised:2014-03-22 Online:2014-08-05 Published:2014-07-15
  • Contact: Lingjun Wang E-mail:smu868@163.com

摘要: 目的 观察心力衰竭时自噬相关蛋白的表达以及抑制自噬对心力衰竭的影响,探讨自噬在心力衰竭发病过程中的作用。方法 实验分为对照组、心力衰竭组和3甲基腺嘌呤(3- methyladenine,3MA)组。心力衰竭组采用腹主动脉缩窄术制备大鼠心力衰竭动物模型。3MA组给予心力衰竭大鼠自噬特异性抑制剂3MA 15mg/kg,连续两周。采用心导管术检测大鼠左室舒张末压(LVEDP) 、左室等容收缩期压力上升最大速率 (+dp/dt max)、左室等容舒张期压力下降的最大速率-dp/dt max。用Western blot法检测心肌组织自噬相关蛋白Beclin-1、Cathepsin D的表达。结果 1)心力衰竭组LVEDP较对照组显著增加(P<0.05),±dp/dtmax较对照组显著降低(P<0.05)。使用3MA组LVEDP较心力衰竭组显著降低(P<0.05),±dp/dtmax较心力衰竭组显著增加(P<0.05)。2)心力衰竭组心肌组织自噬相关蛋白Beclin-1和Cathepsin D表达较对照组显著增加(P<0.05),而3MA组Beclin-1、Cathepsin D的表达较心力衰竭组显著减少(P<0.05)。结论 心肌细胞自噬在心力衰竭发病过程中发挥着致病作用。

关键词: 自噬, 心力衰竭, 3-methyladenine, Beclin-1, Cathepsin D

Abstract: Objective This study was performed to investigate the pathogenic role of autophagic cardiomyocyte death in heart failure. Methods Thirty SD rats were randomized into three groups: control group, heart failure group and 3MA group. In heart failure group, heart failure was induced by abdominal aorta constriction. The 3-methyladenine (3MA), a specific inhibitor on autophagy was used in a heart failure model of rats induced by induced by pressure overload produced by constriction of the abdominal aorta. We examined the heart function of rats in three groups. In addition, we analyzed the expression of autophagy associated protein, beclin-1 and cathepsin D in rat hearts using Western blotting. Results The expression of beclin-1 and cathepsin D in the hearts of heart failure rats were significantly increased as compared those in control group(P<0.05). 3MA significantly improved cardiac function and strongly downregulated the expression of beclin 1 and cathepsin D in abdominal aorta constriction-induced failing heart. Conclusion: Autophagic cardiomyocyte death plays an important role in the pathogenesis of heart failure in rats induced by pressure overload.

Key words: autophagy, heart Failure, 3-methyladenine, Beclin-1, Cathepsin D

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