Objective: To explore the protective effect of camellia oil against H2O2-induced oxidative stress injury in rat H9C2 cardiomyocytes. Methods: CCK8 method was used to detect the cell survival rate of H9C2 cardiomyocyte...Objective: To explore the protective effect of camellia oil against H2O2-induced oxidative stress injury in rat H9C2 cardiomyocytes. Methods: CCK8 method was used to detect the cell survival rate of H9C2 cardiomyocytes treated with different concentrations of H2O2. Normal cultured cells were used as the blank control group, and the cells were treated with 200 μmol/L H2O2 for 24 h. An oxidative stress injury model was constructed as the model group. The cells were pretreated with 1%, 0.1% and 0.01% camellia oil for 24 h, and then H2O2 was added for 24 h as the experimental group. The β-galactosidase senescence staining assay, mitochondrial membrane potential assay, EdU cell proliferation staining assay and scratch assay were used to observe the changes of cell senescence, mitochondrial membrane potential, proliferation, apoptosis and migration in each group. The superoxide dismutase (SOD) activity, lactate dehydrogenase (LDH) activity, and malondialdehyde (MDA) content of the cells in each group were detected by using the kit. Results: The cell viability of H9C2 cardiomyocytes treated with different concentrations of H2O2 was inhibited and positively correlated with the concentration of H2O2 (P<0.01). Compared with the blank control group, the positive rate of cell senescence, MDA content and LDH activity increased in the H2O2 model group (P<0.01);mitochondrial membrane potential, cellular value-added rate, migration rate and SOD activity decreased (P<0.01). Compared with the H2O2 model group, the positive rate of cellular senescence (P<0.01 or P<0.05), MDA content and LDH activity decreased (P< 0.01 or P<0.05);mitochondrial membrane potential increased, cell proliferation rate and migration rate increased (P<0.01 or P<0.05) in the experimental group. Conclusion: Camellia oil can significantly inhibit oxidative stress injury in H9C2 cells and exert cardiomyocyte protective effects.展开更多
目的通过建立氧糖剥夺-缺氧复氧(oxygen-glucose deprivation/reoxygenation,OGD/R)损伤模型模拟心肌缺血再灌注损伤,探讨海藻糖对OGD/R大鼠H9C2心肌细胞损伤的影响及其作用机制。方法H9C2细胞分为对照组、OGD/R组、海藻糖组(OGD/R+海藻...目的通过建立氧糖剥夺-缺氧复氧(oxygen-glucose deprivation/reoxygenation,OGD/R)损伤模型模拟心肌缺血再灌注损伤,探讨海藻糖对OGD/R大鼠H9C2心肌细胞损伤的影响及其作用机制。方法H9C2细胞分为对照组、OGD/R组、海藻糖组(OGD/R+海藻糖)、联合组(OGD/R+海藻糖+ML385)。四甲基偶氮唑盐法检测细胞增殖能力,并通过检测乳酸脱氢酶及Hoechst/丙啶碘化物染色检测细胞膜受损情况。Western blot检测核因子E2相关因子2(nuclear factor erythroid 2-related factor 2,Nrf2)及其下游相关蛋白表达;活性氧、线粒体膜电位检测氧化应激水平;Western blot检测凋亡相关蛋白表达。结果与对照组比较,OGD/R组细胞活力明显降低。与OGD/R组比较,不同浓度海藻糖干预能显著提升细胞活力,与海藻糖浓度呈正相关(P<0.01);与OGD/R组比较,海藻糖组线粒体膜电位(mitochondrial membrane potential,MMP)、谷胱甘肽(glutathione,GSH)、Nrf2、血红素加氧酶1和烟酰胺腺嘌呤二核苷酸磷酸醌氧化还原酶1、Bcl-2、半胱氨酸天冬氨酸蛋白酶3(cysteinyl aspartate specific proteinase-3,Caspase-3)表达明显增高,活性氧、丙二醛、应答元素结合蛋白1、Bax、Bax/Bcl-2、裂解型Caspase-3表达明显降低,差异有统计学意义(P<0.05,P<0.01)。与海藻糖组比较,联合组活性氧、丙二醛及肿瘤坏死因子α、白细胞介素(interleukin,IL)1βmRNA、IL-6 mRNA表达明显增高,MMP、GSH水平明显降低,差异有统计学意义(P<0.05,P<0.01);联合组Bax、Bax/Bcl-2、裂解型Caspase-3表达明显高于海藻糖组(1.77±0.08 vs 1.20±0.20,3.41±1.45 vs 0.99±0.15,4.10±1.05 vs 1.79±0.52,P<0.01),Bcl-2、Caspase-3表达明显低于海藻糖组(0.58±0.21 vs 1.23±0.25,0.87±0.25 vs 1.45±0.31,P<0.01)。结论海藻糖可以被视为一种Nrf2激活剂,通过激活Nrf2抑制氧化应激和凋亡,改善OGD/R诱导的心肌细胞损伤。展开更多
目的研究交趾黄檀Dalbergia cochinchinensis Pierre ex Laness的新黄酮类成分及其抗H9c2心肌细胞缺氧/复氧损伤活性。方法交趾黄檀70%乙醇提取物采用硅胶、Sephadex LH-20、反相制备HPLC进行分离纯化,根据理化性质及波谱数据鉴定所得...目的研究交趾黄檀Dalbergia cochinchinensis Pierre ex Laness的新黄酮类成分及其抗H9c2心肌细胞缺氧/复氧损伤活性。方法交趾黄檀70%乙醇提取物采用硅胶、Sephadex LH-20、反相制备HPLC进行分离纯化,根据理化性质及波谱数据鉴定所得化合物的结构。采用CCK-8法检测其对H9c2心肌细胞的活性及对H9c2细胞缺氧/复氧损伤的保护作用,并分析其构效关系。结果从中分离得到12个化合物,分别鉴定为阔叶黄檀酚(1)、5-O-methyllatifolin(2)、mimosifoliol(3)、5-O-methydalbergiphenol(4)、dalbergiphenol(5)、cearoin(6)、2,4-dihydroxy-5-methoxy-benzophenone(7)、2-hydroxy-4,5-dimethoxybenzophenone(8)、melannoin(9)、2,2′,5-trihydroxy-4-methoxybenzophenone(10)、黄檀素(11)、4-甲氧基黄檀醌(12)。黄檀酚及黄檀内酯类化合物对H9c2细胞毒性较小,黄檀酚类化合物抗H9c2心肌细胞缺氧/复氧损伤活性较强。结论化合物8为新天然产物,化合物4、9为首次从该植物中分离得到。黄檀酚类化合物可能是抗H9c2细胞缺氧/复氧损伤的主要新黄酮类成分。展开更多
The nanoparticle coagulation is investigated by using a couple of fluid models and aerosol dynamics model in argon with a 5% molecular acetylene admixture rf microdischarges,with the total input gas flow rate of 400 s...The nanoparticle coagulation is investigated by using a couple of fluid models and aerosol dynamics model in argon with a 5% molecular acetylene admixture rf microdischarges,with the total input gas flow rate of 400 sccm.It co-exists with a homogeneous,secondary electron-dominated low temperature γ-mode glow discharges.The heat transfer equation and flow equation for neutral gas are taken into account.We mainly focused on investigations of the nanoparticle properties in atmospheric pressure microdischarges,and discussed the influences of pressure,electrode spacing,and applied voltage on the plasma density and nanoparticle density profiles.The results show that the characteristics of microdischarges are quite different from those of low pressure radio-frequency discharges.First,the nanoparticle density in the bulk plasma in microdischarges is much larger than that of low pressure discharges.Second,the nanoparticle density of 10 nm experiences an exponential increase as soon as the applied voltage increases,especially in the presheath.Finally,as the electrode spacing increases,the nanoparticle density decreased instead of increasing.展开更多
The effect of the dielectric ring on the plasma radial uniformity is numerically investigated in the practical 450-mm capacitively coupled plasma reactor by a two-dimensional self-consistent fluid model. The simulatio...The effect of the dielectric ring on the plasma radial uniformity is numerically investigated in the practical 450-mm capacitively coupled plasma reactor by a two-dimensional self-consistent fluid model. The simulations were performed for N2/Ar discharges at the pressure of 300 Pa, and the frequency of 13.56 MHz. In the practical plasma treatment process,the wafer is always surrounded by a dielectric ring, which is less studied. In this paper, the plasma characteristics are systematically investigated by changing the properties of the dielectric ring, i.e., the relative permittivity, the thickness and the length. The results indicate that the plasma parameters strongly depend on the properties of the dielectric ring. As the ratio of the thickness to the relative permittivity of the dielectric ring increases, the electric field at the wafer edge becomes weaker due to the stronger surface charging effect. This gives rise to the lower N~+ ion density, flux and N atom density at the wafer edge. Thus the homogeneous plasma density is obtained by selecting optimal dielectric ring relative permittivity and thickness. In addition, we also find that the length of the dielectric ring should be as short as possible to avoid the discontinuity of the dielectric materials, and thus obtain the large area uniform plasma.展开更多
基金National Natural Science Foundation of China(No.82160597)Guangxi Natural Science Foundation Project(No.2020GXNSFAA159148)。
文摘Objective: To explore the protective effect of camellia oil against H2O2-induced oxidative stress injury in rat H9C2 cardiomyocytes. Methods: CCK8 method was used to detect the cell survival rate of H9C2 cardiomyocytes treated with different concentrations of H2O2. Normal cultured cells were used as the blank control group, and the cells were treated with 200 μmol/L H2O2 for 24 h. An oxidative stress injury model was constructed as the model group. The cells were pretreated with 1%, 0.1% and 0.01% camellia oil for 24 h, and then H2O2 was added for 24 h as the experimental group. The β-galactosidase senescence staining assay, mitochondrial membrane potential assay, EdU cell proliferation staining assay and scratch assay were used to observe the changes of cell senescence, mitochondrial membrane potential, proliferation, apoptosis and migration in each group. The superoxide dismutase (SOD) activity, lactate dehydrogenase (LDH) activity, and malondialdehyde (MDA) content of the cells in each group were detected by using the kit. Results: The cell viability of H9C2 cardiomyocytes treated with different concentrations of H2O2 was inhibited and positively correlated with the concentration of H2O2 (P<0.01). Compared with the blank control group, the positive rate of cell senescence, MDA content and LDH activity increased in the H2O2 model group (P<0.01);mitochondrial membrane potential, cellular value-added rate, migration rate and SOD activity decreased (P<0.01). Compared with the H2O2 model group, the positive rate of cellular senescence (P<0.01 or P<0.05), MDA content and LDH activity decreased (P< 0.01 or P<0.05);mitochondrial membrane potential increased, cell proliferation rate and migration rate increased (P<0.01 or P<0.05) in the experimental group. Conclusion: Camellia oil can significantly inhibit oxidative stress injury in H9C2 cells and exert cardiomyocyte protective effects.
文摘目的通过建立氧糖剥夺-缺氧复氧(oxygen-glucose deprivation/reoxygenation,OGD/R)损伤模型模拟心肌缺血再灌注损伤,探讨海藻糖对OGD/R大鼠H9C2心肌细胞损伤的影响及其作用机制。方法H9C2细胞分为对照组、OGD/R组、海藻糖组(OGD/R+海藻糖)、联合组(OGD/R+海藻糖+ML385)。四甲基偶氮唑盐法检测细胞增殖能力,并通过检测乳酸脱氢酶及Hoechst/丙啶碘化物染色检测细胞膜受损情况。Western blot检测核因子E2相关因子2(nuclear factor erythroid 2-related factor 2,Nrf2)及其下游相关蛋白表达;活性氧、线粒体膜电位检测氧化应激水平;Western blot检测凋亡相关蛋白表达。结果与对照组比较,OGD/R组细胞活力明显降低。与OGD/R组比较,不同浓度海藻糖干预能显著提升细胞活力,与海藻糖浓度呈正相关(P<0.01);与OGD/R组比较,海藻糖组线粒体膜电位(mitochondrial membrane potential,MMP)、谷胱甘肽(glutathione,GSH)、Nrf2、血红素加氧酶1和烟酰胺腺嘌呤二核苷酸磷酸醌氧化还原酶1、Bcl-2、半胱氨酸天冬氨酸蛋白酶3(cysteinyl aspartate specific proteinase-3,Caspase-3)表达明显增高,活性氧、丙二醛、应答元素结合蛋白1、Bax、Bax/Bcl-2、裂解型Caspase-3表达明显降低,差异有统计学意义(P<0.05,P<0.01)。与海藻糖组比较,联合组活性氧、丙二醛及肿瘤坏死因子α、白细胞介素(interleukin,IL)1βmRNA、IL-6 mRNA表达明显增高,MMP、GSH水平明显降低,差异有统计学意义(P<0.05,P<0.01);联合组Bax、Bax/Bcl-2、裂解型Caspase-3表达明显高于海藻糖组(1.77±0.08 vs 1.20±0.20,3.41±1.45 vs 0.99±0.15,4.10±1.05 vs 1.79±0.52,P<0.01),Bcl-2、Caspase-3表达明显低于海藻糖组(0.58±0.21 vs 1.23±0.25,0.87±0.25 vs 1.45±0.31,P<0.01)。结论海藻糖可以被视为一种Nrf2激活剂,通过激活Nrf2抑制氧化应激和凋亡,改善OGD/R诱导的心肌细胞损伤。
文摘目的研究交趾黄檀Dalbergia cochinchinensis Pierre ex Laness的新黄酮类成分及其抗H9c2心肌细胞缺氧/复氧损伤活性。方法交趾黄檀70%乙醇提取物采用硅胶、Sephadex LH-20、反相制备HPLC进行分离纯化,根据理化性质及波谱数据鉴定所得化合物的结构。采用CCK-8法检测其对H9c2心肌细胞的活性及对H9c2细胞缺氧/复氧损伤的保护作用,并分析其构效关系。结果从中分离得到12个化合物,分别鉴定为阔叶黄檀酚(1)、5-O-methyllatifolin(2)、mimosifoliol(3)、5-O-methydalbergiphenol(4)、dalbergiphenol(5)、cearoin(6)、2,4-dihydroxy-5-methoxy-benzophenone(7)、2-hydroxy-4,5-dimethoxybenzophenone(8)、melannoin(9)、2,2′,5-trihydroxy-4-methoxybenzophenone(10)、黄檀素(11)、4-甲氧基黄檀醌(12)。黄檀酚及黄檀内酯类化合物对H9c2细胞毒性较小,黄檀酚类化合物抗H9c2心肌细胞缺氧/复氧损伤活性较强。结论化合物8为新天然产物,化合物4、9为首次从该植物中分离得到。黄檀酚类化合物可能是抗H9c2细胞缺氧/复氧损伤的主要新黄酮类成分。
文摘目的 探究单宁酸对缺氧诱导的H9c2心肌细胞的保护作用及机制。方法 体外培养大鼠H9c2细胞,利用条件培养基和缺氧小室建立缺氧诱导的H9c2细胞损伤模型,分为对照组、缺氧1组、低剂量单宁酸组(0.2μmol单宁酸)和高剂量单宁酸组(0.8μmol单宁酸)。利用鱼藤酮进行功能回复实验,分为缺氧2组、缺氧+鱼藤酮抑制剂组(50 nmol鱼藤酮)、缺氧+鱼藤酮抑制剂+高剂量单宁酸组(50 nmol鱼藤酮+0.8μmol单宁酸)、缺氧+高剂量单宁酸组(0.8μmol单宁酸)。细胞计数试剂盒8法和乳酸脱氢酶(LDH)评估细胞损伤;化学荧光法检测细胞内活性氧(ROS)、线粒体ROS;流式细胞术检测细胞凋亡率;Western blot检测Nod样受体热蛋白结构域相关蛋白3(NLRP3)、半胱氨酸天冬氨酸蛋白酶1(Caspase-1)、消皮素D(GSDMD)和白细胞介素1β(IL-1β)蛋白表达;酶联免疫吸附测定IL-1β分泌。结果 与对照组比较,缺氧1组H9c2细胞密度降低,贴壁不牢,细胞存活率显著降低,LDH活性、细胞凋亡率、NLRP3、裂解的(Cleaved)Caspases-1、Cleaved-GSDMD和Cleaved-IL-1β蛋白表达水平显著升高(P<0.05);与缺氧组1比较,低剂量单宁酸组、高剂量单宁酸组细胞存活率显著升高,LDH活性、细胞凋亡率、NLRP3、Cleaved-Caspases-1、Cleaved-GSDMD和Cleaved-IL-1β蛋白表达水平、分泌的IL-1β水平显著降低(P<0.05)。与缺氧2组比较,缺氧+鱼藤酮抑制剂组线粒体ROS、NLRP3、Cleaved-IL-1β蛋白表达水平显著升高(P<0.05);与缺氧+高剂量单宁酸组比较,缺氧+鱼藤酮抑制剂+高剂量单宁酸组的线粒体ROS(0.85±0.02 vs 0.40±0.03)、NLRP3(0.61±0.03 vs 0.47±0.05)、Cleaved-IL-1β蛋白表达水平(0.70±0.06 vs 0.48±0.09)显著升高(P<0.05)。结论 单宁酸可通过抑制ROS/NLRP3通路介导的焦亡,减轻缺氧诱导的H9c2细胞损伤。
基金Project supported by the Natural Science Foundation of Heilongjiang Province,China(Grant Nos.A2015011 and A2015010)the Postdoctoral Scientific Research Development Fund of Heilongjiang Province,China(Grant No.LBH-Q14159)+2 种基金the Program for Young Teachers Scientific Research in Qiqihar University(Grant No.2014k-Z11)the National Natural Science Foundation of China(Grant No.11404180)the University Nursing Program for Yong Scholars with Creative Talents in Heilongjiang Province,China(Grant No.UNPYSCT-2015095)
文摘The nanoparticle coagulation is investigated by using a couple of fluid models and aerosol dynamics model in argon with a 5% molecular acetylene admixture rf microdischarges,with the total input gas flow rate of 400 sccm.It co-exists with a homogeneous,secondary electron-dominated low temperature γ-mode glow discharges.The heat transfer equation and flow equation for neutral gas are taken into account.We mainly focused on investigations of the nanoparticle properties in atmospheric pressure microdischarges,and discussed the influences of pressure,electrode spacing,and applied voltage on the plasma density and nanoparticle density profiles.The results show that the characteristics of microdischarges are quite different from those of low pressure radio-frequency discharges.First,the nanoparticle density in the bulk plasma in microdischarges is much larger than that of low pressure discharges.Second,the nanoparticle density of 10 nm experiences an exponential increase as soon as the applied voltage increases,especially in the presheath.Finally,as the electrode spacing increases,the nanoparticle density decreased instead of increasing.
基金supported by the National Natural Science Foundation of China(Grant Nos.11335004 and 11405019)the Important National Science and Technology Specific Project of China(Grant No.2011ZX02403-001)
文摘The effect of the dielectric ring on the plasma radial uniformity is numerically investigated in the practical 450-mm capacitively coupled plasma reactor by a two-dimensional self-consistent fluid model. The simulations were performed for N2/Ar discharges at the pressure of 300 Pa, and the frequency of 13.56 MHz. In the practical plasma treatment process,the wafer is always surrounded by a dielectric ring, which is less studied. In this paper, the plasma characteristics are systematically investigated by changing the properties of the dielectric ring, i.e., the relative permittivity, the thickness and the length. The results indicate that the plasma parameters strongly depend on the properties of the dielectric ring. As the ratio of the thickness to the relative permittivity of the dielectric ring increases, the electric field at the wafer edge becomes weaker due to the stronger surface charging effect. This gives rise to the lower N~+ ion density, flux and N atom density at the wafer edge. Thus the homogeneous plasma density is obtained by selecting optimal dielectric ring relative permittivity and thickness. In addition, we also find that the length of the dielectric ring should be as short as possible to avoid the discontinuity of the dielectric materials, and thus obtain the large area uniform plasma.
