人参皂苷Rb1改善自噬流抗离体大鼠心脏心肌缺血再灌注损伤

李洋 姜永良 陆地 董川书 普俞维 杨萍 孙林

解剖学报 ›› 2020, Vol. 51 ›› Issue (2) : 265-272.

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解剖学报 ›› 2020, Vol. 51 ›› Issue (2) : 265-272. DOI: 10.16098/j.issn.0529-1356.2020.02.019
组织学胚胎学发育生物学

人参皂苷Rb1改善自噬流抗离体大鼠心脏心肌缺血再灌注损伤

  • 李洋1 姜永良2 陆地3 董川书1 普俞维2 杨萍1* 孙林2*
作者信息 +

Ginsenoside Rb1 improving autophagic flux against myocardial ischemia reperfusion injury in isolatedheart of rat

  • LI Yang1 JIANG Yong-liang2 LU Di3 DONG Chuan-shu1 PU Yu-wei2 YANG Ping1* SUN Lin2*
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摘要

目的  通过Langendorff系统构建离体大鼠心肌缺血/再灌注 (I/R) 损伤模型,探讨人参皂苷Rb1对心肌I/R损伤的保护作用及机制。  方法  选取健康成年雄性SD大鼠60只,随机分为假手术组、I/R组和人参皂苷Rb1 (1、5、10和20 μmol/L) 预处理组,每组10只。大鼠开胸、结扎主动脉后,取出心脏置于Langendorff系统进行灌流,按照分组情况构建相应模型。采用Lab Chart电生理系统检测心率(HR)、左心室发展压 (LVDP)、左室压上升/下降最大速率 (±dp/dtmax) 等相关心功能指标;采用TTC染色法检测心肌梗死面积;采用Western blotting检测Beclin 1、LC3、p62和Lamp 2表达情况;采用免疫组织化学法检测Beclin 1表达情况。  结果  人参皂苷Rb1 (1、5、10和20 μmol/L) 改善由I/R损伤导致的LVDP 和±dp/dtmax 的下降,减少心肌梗死面积,其中10 μmol/L浓度人参皂苷Rb1对心功能保护作用最显著(P<0.05)。Beclin 1在I/R组心肌细胞胞质中阳性表达率显著增高,加入人参皂苷Rb1 (10 μmol/L) 后表达量减少(P<0.05)。与sham组相比,在I/R组发现自噬流受损: 自噬相关蛋白Beclin 1、LC3和p62表达水平升高,Lamp 2表达水平下调(P<0.05)。加入人参皂苷Rb1 (10 μmol/L) 后上述蛋白的调控作用被反转,自噬流通畅 (P<0.05)。  结论  人参皂苷Rb1预处理通过改善自噬流受损发挥抗大鼠离体心肌I/R损伤的保护作用,其中以10 μmol/L浓度的人参皂苷Rb1保护作用最好。

Abstract

Objective  To explore the protective effect of ginsenoside Rb1 on the myocardial ischemia/reperfusion(I/R) injury in rats in vitro.   Methods  Totally 60 adult male SD rats were randomly divided into 6 groups:sham group,I/R group,ginsenosde Rb1 pretreatment groups(at the doses of 1 μmol/L,5 μmol/L,10 μmol/L and 20 μmol/L,respectively), 10 in each group. The Langendorff perfusion system was used to establish I/R model. The Lab Chart electrophysiological system was used to monitor real-time heart function by monitoring heart rate (HR),left ventricular development pressure (LVDP) and left ventricular development pressure (±dp/dtmax). TTC staining method  was used to measure myocardial infarct size. The Western blotting were used to assay Beclin 1,LC3,p62 and Lamp 2 expression,respectively. The immunohistochemistry were used to assay Beclin 1 expression.   Results  Ginsenoside Rbl of all the four different concent rations improved the decrease of LVDP and±dp/dtmax arising from myocardial I/R injury. Meanwhile,ginsenoside Rbl significantly decreased the area of cardial infarction.Ginsenoside Rb1 (10 μmol/L) precondition group protected the heart most significantly (P<0.05). The expression of Beclin 1 with I/R increased significantly in the cytoplasm of cardiomyocytes. Moreover, Beclin 1 expression decreased after addition pretreatment with ginsenoside Rb1 (10 μmol/L) (P<0.05). Compared with sham group, we found that the autophagic flux was impaired in I/R group which the expression of Beclin 1,LC3 and p62 increased significantly, as well as the expression of Lamp 2 decreased significantly. On the other hand, pretreatment with ginsenoside Rb1 (10 μmol/L) could reverse impaired autophagic flux (P<0.05).   Conclusion  Ginsenoside Rbl demonstrates pharmacological preconditioning effect and protects against myocardial I/R injury by improving damaged-autophagy flux, the dose of 10 μmol/L precondition protectes the heart most significantly.

关键词

离体心脏 / 心肌缺血再灌注损伤 / 自噬流 / 人参皂苷Rb1 / Langendorff系统 / 免疫印迹法 / 大鼠

Key words

Isolated heart / Myocardial ischemia/reperfusion injury / Autophagy flux / Ginsenoside Rb1 / Langendorff system / Western blotting / Rat

引用本文

导出引用
李洋 姜永良 陆地 董川书 普俞维 杨萍 孙林. 人参皂苷Rb1改善自噬流抗离体大鼠心脏心肌缺血再灌注损伤[J]. 解剖学报. 2020, 51(2): 265-272 https://doi.org/10.16098/j.issn.0529-1356.2020.02.019
LI Yang JIANG Yong-liang LU Di DONG Chuan-shu PU Yu-wei YANG Ping SUN Lin. Ginsenoside Rb1 improving autophagic flux against myocardial ischemia reperfusion injury in isolatedheart of rat[J]. Acta Anatomica Sinica. 2020, 51(2): 265-272 https://doi.org/10.16098/j.issn.0529-1356.2020.02.019
中图分类号: R541.4    

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基金

天麻素在动脉粥样硬化治疗中的信号调控机制;天麻素在心肌缺血再灌注损伤治疗中的作用及其信号机制研究;人参皂苷Rb1在心肌缺血再灌注损伤治疗中的信号调控机制

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