Objectives: To investigate the protective effects of Shexiang Tongxin Dropping Pill(麝香通心滴丸,STP) on Na2S2O4-induced hypoxia-reoxygenation injury in cardiomyoblast H9c2 cells. Methods: The cell viability and level...Objectives: To investigate the protective effects of Shexiang Tongxin Dropping Pill(麝香通心滴丸,STP) on Na2S2O4-induced hypoxia-reoxygenation injury in cardiomyoblast H9c2 cells. Methods: The cell viability and levels of mRNA and protein expression in H9c2 cells were determined following Na2S2O4-induced hypoxia using Hoechst staining, annexin V/propidium iodide(PI) flow cytometry, real-time polymerase chain reaction and Western blot analysis. Results: STP pretreatment signi?cantly increased the viability and inhibited aberrant morphological changes in H9c2 cardiomyoblast cells induced by Na2S2O4 treatment(P<0.05). In addition, STP pretreatment attenuated Na2S2O4-induced hypoxic damage, down-regulated the expression of pro-apoptotic Bax,and up-regulated the expression of anti-apoptotic Bcl-2 in H9c2 cells(P<0.05). Conclusions: STP was strongly cardioprotective in hypoxia-reoxygenation injury by preventing hypoxic damage and inhibiting cellular apoptosis.These results further support the use of STP as an effective drug for the treatment of ischemic heart disease.展开更多
Objective: To investigate the effects of salvianolic acid A(SAA) on cardiomyocyte apoptosis and mitochondrial dysfunction in response to hypoxia/reoxygenation(H/R) injury and to determine whether the Akt signaling pat...Objective: To investigate the effects of salvianolic acid A(SAA) on cardiomyocyte apoptosis and mitochondrial dysfunction in response to hypoxia/reoxygenation(H/R) injury and to determine whether the Akt signaling pathway might play a role. Methods: An in vitro model of H/R injury was used to study outcomes on primary cultured neonatal rat cardiomyocytes. The cardiomyocytes were treated with 12.5, 25, 50 μg/m L SAA at the beginning of hypoxia and reoxygenation, respectively. Adenosine triphospate(ATP) and reactive oxygen species(ROS) levels were assayed. Cell apoptosis was evaluated by flow cytometry and the expression of cleavedcaspase 3, Bax and Bcl-2 were detected by Western blotting. The effects of SAA on mitochondrial dysfunction were examined by determining the mitochondrial membrane potential(△Ψm) and mitochondrial permeability transition pore(m PTP), followed by the phosphorylation of Akt(p-Akt) and GSK-3β(p-GSK-3β), which were measured by Western blotting. Results: SAA significantly preserved ATP levels and reduced ROS production. Importantly, SAA markedly reduced the number of apoptotic cel s and decreased cleaved-caspase 3 expression levels, while also reducing the ratio of Bax/Bcl-2. Furthermore, SAA prevented the loss of △Ψm and inhibited the activation of m PTP. Western blotting experiments further revealed that SAA significantly increased the expression of p-Akt and p-GSK-3β, and the increase in p-GSK-3β expression was attenuated after inhibition of the Akt signaling pathway with LY294002. Conclusion: SAA has a protective effect on cardiomyocyte H/R injury; the underlying mechanism may be related to the preservation of mitochondrial function and the activation of the Akt/GSK-3β signaling pathway.展开更多
目的探究七氟醚预处理对大鼠H9C2心肌细胞缺氧/复氧后,对转录沉默信息调节器3(SIRT3)的表达及细胞蛋白乙酰化的影响。方法将大鼠H9C2心肌细胞随机分为对照组、缺氧/复氧组和七氟醚预处理组。低氧培养箱构建缺氧/复氧模型:对照组心肌细...目的探究七氟醚预处理对大鼠H9C2心肌细胞缺氧/复氧后,对转录沉默信息调节器3(SIRT3)的表达及细胞蛋白乙酰化的影响。方法将大鼠H9C2心肌细胞随机分为对照组、缺氧/复氧组和七氟醚预处理组。低氧培养箱构建缺氧/复氧模型:对照组心肌细胞无任何处理;缺氧/复氧组心肌细胞缺氧2 h/复氧2 h;七氟醚预处理组心肌细胞在缺氧/复氧前予以2.5%七氟醚预处理1 h。四甲基偶氮唑蓝(MTT)检测各组细胞存活率;采用JC-1荧光探针检测线粒体膜电位;采用Western blotting法检测细胞整体蛋白及线粒体蛋白乙酰化水平、SIRT3表达及线粒体自噬水平的变化。结果缺氧/复氧组较对照组心肌细胞SIRT3(0.78±0.04 vs 1.04±0.06)表达减少,细胞整体蛋白(1.72±0.06 vs 0.98±0.03)及线粒体蛋白(0.96±0.03 vs 0.45±0.03)乙酰化水平升高(P<0.05);同时心肌细胞存活率[(48.2±0.4)%vs 100%]、线粒体膜电位(1.72±0.14 vs 2.83±0.11)下降,线粒体自噬水平升高(P<0.05);与缺氧/复氧组相比,七氟醚预处理组心肌细胞SIRT3表达增加(0.93±0.03 vs 0.78±0.04),细胞整体蛋白(1.34±0.05 vs 1.72±0.06)及线粒体蛋白(0.65±0.04 vs 0.96±0.03)乙酰化水平降低(P<0.05);同时心肌细胞存活率[(65.80±1.53)%vs(48.20±0.40)%]及线粒体膜电位(2.33±0.12 vs 1.72±0.14)升高,线粒体自噬激活水平降低(P<0.05)。结论七氟醚预处理可以增加SIRT3表达,降低心肌细胞缺氧/复氧损伤后蛋白的乙酰化水平,可能是七氟醚预处理对心肌细胞保护作用的潜在分子机制。展开更多
基金the Foundation of Fujian University of Traditional Chinese Medicine (No. X2013026)the Developmental Fund of Chen Ke-ji Integrative Medicine (No. CKJ2013016)the Education Department of Fujian Province (No. JA14163).
文摘Objectives: To investigate the protective effects of Shexiang Tongxin Dropping Pill(麝香通心滴丸,STP) on Na2S2O4-induced hypoxia-reoxygenation injury in cardiomyoblast H9c2 cells. Methods: The cell viability and levels of mRNA and protein expression in H9c2 cells were determined following Na2S2O4-induced hypoxia using Hoechst staining, annexin V/propidium iodide(PI) flow cytometry, real-time polymerase chain reaction and Western blot analysis. Results: STP pretreatment signi?cantly increased the viability and inhibited aberrant morphological changes in H9c2 cardiomyoblast cells induced by Na2S2O4 treatment(P<0.05). In addition, STP pretreatment attenuated Na2S2O4-induced hypoxic damage, down-regulated the expression of pro-apoptotic Bax,and up-regulated the expression of anti-apoptotic Bcl-2 in H9c2 cells(P<0.05). Conclusions: STP was strongly cardioprotective in hypoxia-reoxygenation injury by preventing hypoxic damage and inhibiting cellular apoptosis.These results further support the use of STP as an effective drug for the treatment of ischemic heart disease.
基金National Basic Research Program of China (973 Program,No.2015CB554400).
文摘Objective: To investigate the effects of salvianolic acid A(SAA) on cardiomyocyte apoptosis and mitochondrial dysfunction in response to hypoxia/reoxygenation(H/R) injury and to determine whether the Akt signaling pathway might play a role. Methods: An in vitro model of H/R injury was used to study outcomes on primary cultured neonatal rat cardiomyocytes. The cardiomyocytes were treated with 12.5, 25, 50 μg/m L SAA at the beginning of hypoxia and reoxygenation, respectively. Adenosine triphospate(ATP) and reactive oxygen species(ROS) levels were assayed. Cell apoptosis was evaluated by flow cytometry and the expression of cleavedcaspase 3, Bax and Bcl-2 were detected by Western blotting. The effects of SAA on mitochondrial dysfunction were examined by determining the mitochondrial membrane potential(△Ψm) and mitochondrial permeability transition pore(m PTP), followed by the phosphorylation of Akt(p-Akt) and GSK-3β(p-GSK-3β), which were measured by Western blotting. Results: SAA significantly preserved ATP levels and reduced ROS production. Importantly, SAA markedly reduced the number of apoptotic cel s and decreased cleaved-caspase 3 expression levels, while also reducing the ratio of Bax/Bcl-2. Furthermore, SAA prevented the loss of △Ψm and inhibited the activation of m PTP. Western blotting experiments further revealed that SAA significantly increased the expression of p-Akt and p-GSK-3β, and the increase in p-GSK-3β expression was attenuated after inhibition of the Akt signaling pathway with LY294002. Conclusion: SAA has a protective effect on cardiomyocyte H/R injury; the underlying mechanism may be related to the preservation of mitochondrial function and the activation of the Akt/GSK-3β signaling pathway.
文摘目的探究七氟醚预处理对大鼠H9C2心肌细胞缺氧/复氧后,对转录沉默信息调节器3(SIRT3)的表达及细胞蛋白乙酰化的影响。方法将大鼠H9C2心肌细胞随机分为对照组、缺氧/复氧组和七氟醚预处理组。低氧培养箱构建缺氧/复氧模型:对照组心肌细胞无任何处理;缺氧/复氧组心肌细胞缺氧2 h/复氧2 h;七氟醚预处理组心肌细胞在缺氧/复氧前予以2.5%七氟醚预处理1 h。四甲基偶氮唑蓝(MTT)检测各组细胞存活率;采用JC-1荧光探针检测线粒体膜电位;采用Western blotting法检测细胞整体蛋白及线粒体蛋白乙酰化水平、SIRT3表达及线粒体自噬水平的变化。结果缺氧/复氧组较对照组心肌细胞SIRT3(0.78±0.04 vs 1.04±0.06)表达减少,细胞整体蛋白(1.72±0.06 vs 0.98±0.03)及线粒体蛋白(0.96±0.03 vs 0.45±0.03)乙酰化水平升高(P<0.05);同时心肌细胞存活率[(48.2±0.4)%vs 100%]、线粒体膜电位(1.72±0.14 vs 2.83±0.11)下降,线粒体自噬水平升高(P<0.05);与缺氧/复氧组相比,七氟醚预处理组心肌细胞SIRT3表达增加(0.93±0.03 vs 0.78±0.04),细胞整体蛋白(1.34±0.05 vs 1.72±0.06)及线粒体蛋白(0.65±0.04 vs 0.96±0.03)乙酰化水平降低(P<0.05);同时心肌细胞存活率[(65.80±1.53)%vs(48.20±0.40)%]及线粒体膜电位(2.33±0.12 vs 1.72±0.14)升高,线粒体自噬激活水平降低(P<0.05)。结论七氟醚预处理可以增加SIRT3表达,降低心肌细胞缺氧/复氧损伤后蛋白的乙酰化水平,可能是七氟醚预处理对心肌细胞保护作用的潜在分子机制。