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首页> 中文期刊> 《中国药理学通报》 >麦冬皂苷D通过降低自噬抑制血管紧张素Ⅱ诱导的心肌肥大

麦冬皂苷D通过降低自噬抑制血管紧张素Ⅱ诱导的心肌肥大

         
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摘要

目的麦冬皂苷D是否抑制血管紧张素Ⅱ( AngⅡ)所引起的心肌肥大及其可能机制。方法体外培养大鼠心肌细胞系H9c2,MTS法检测麦冬皂苷 D的细胞毒性；其次将1μmol·L-1的AngⅡ作用于H9c2细胞24h后引起心肌肥大,用不同浓度的麦冬皂苷D( ophiopogonin D,OPD)共处理, BCA法检测总蛋白含量；实时荧光定量PCR技术检测标志性肥大基因BNP和β-MHC的mRNA表达；Western blot法检测自噬蛋白LC3B的表达,同时运用高内涵筛选技术检测心肌细胞自噬蛋白 LC3B 的表达以及线粒体膜电位的改变。结果细胞活力的检测结果显示,与对照组相比,AngⅡ不同浓度作用24 h后,对细胞活力无明显影响,而麦冬皂苷D的高浓度(50~100μmol·L-1)可明显抑制细胞的活性；AngⅡ作用于心肌细胞24h后,可引起心肌肥大,导致特异性肥大基因mRNA表达上调,并且明显增加细胞总蛋白含量；同时使心肌细胞自噬增强；线粒体膜电位降低,而麦冬皂苷D共处理能明显逆转上述指标。结论麦冬皂苷D对AngⅡ所诱导的心肌肥大有抑制作用。%Aim To study whether Ophiopogonin D has an effect inhibitory on myocardial hypertrophy induced by AngiotensinⅡand its possible mechanism. Methods Rat myocardial cell line H9 c2 were cultured in vitro. The effect of Ophiopogonin D on cell vitality was tested by;H9 c2 cells were treated with AngⅡ 1μmol ·L-1 after 24h to induce the cardiac hypertrophy,then it was co-treated with different concentrations of Ophio-pogonin D were added for 24h. After above,the total protein content was detected by BCA method;Quantita-tive real-time PCR ( qRT-PCR ) technique was used to examine the expression of marker genes BNP and β-MHC mRNA ,which representing the function of hear-ing; Western blot was used method to detect the ex-pression of autophagy protein LC3 B and high-through-put screening technology was emptoyed to verify it. In addi-tion, the changes of mitochondrial membrane po-tential in H9c2 myocardial cell were also examined. Results The cell viability results showed that H9 c-2 cells exposed to different concentrations of AngⅡ had no significant effect on vitality compared with the con-trol group after 24 h,but high concentrations of Ophio-pogonin D ( 50 ~100μmol · L-1 ) could obviously in-hibit the cell activity. Ot-her experimental results showed that myocardial cells treated with AngⅡ for 24h could cause myocardial hypertrophy,which appar-ently displayed the growth level of specific hypertrophic gene mRNA expression and the marked increase of the total protein expression. As hypertrophy was activated by AngⅡ, cells autophagy would be significantly en-hanced at the same time, more-over, the mitochondrial membrane potential would be reduced. But the effects of Ophiopogonin D could significantly reverse those pathological changes. Conclusion All above experi-mental results indicate that Ophiopogonin D can in-hibitmyocardial hypertrophy induced by AngⅡand pos-sibly plays a critical role in cardiovascular protection.

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