Objective To investigate in vitro cytotoxicity and oxidative stress response induced by multiwalled carbon nanotubes （MWCNTs）. Methods Cultured macrophages （murine RAW264.7 cells） and alveolar epithelium cells typ...Objective To investigate in vitro cytotoxicity and oxidative stress response induced by multiwalled carbon nanotubes （MWCNTs）. Methods Cultured macrophages （murine RAW264.7 cells） and alveolar epithelium cells type II （human A549 lung cells） were exposed to the blank control, DNA salt control, and the MWCNTs suspensions at 2.5, 10, 25, and 100 ug/mL for 24 h. Each treatment was evaluated by cell viability, cytotoxicity and oxidative stress. Results Overall, both cell lines had similar patterns in response to the cytotoxicity and oxidative stress of MWCNTs. DNA salt treatment showed no change compared to the blank control. In both cell lines, significant changes at the doses of 25 and 100 ug/mL treatments were found in cell viabilities, cytotoxicity, and oxidative stress indexes. The reactive oxygen species （ROS） generation was also found to be significantly higher at the dose of 10 ug/mL treatment, whereas no change was seen in most of the indexes. The ROS generation in both cell lines went up in minutes, reached the climax within an hour and faded down after several hours. Conclusion Exposure to MWCNTs resulted in a dose-dependent cytotoxicity in cultured RAW264.7 cells and A549 cells, that was closely correlated to the increased oxidative stress.展开更多
目的:探究叉分蓼多糖(Polygonum divaricatum L. polysaccharides,PSPDL)体外抗炎活性及其作用机制。方法:从叉分蓼中提取多糖,采用高效凝胶渗透色谱、高效液相色谱、傅里叶变换红外光谱、X射线衍射、核磁共振波谱技术对其结构进行表征...目的:探究叉分蓼多糖(Polygonum divaricatum L. polysaccharides,PSPDL)体外抗炎活性及其作用机制。方法:从叉分蓼中提取多糖,采用高效凝胶渗透色谱、高效液相色谱、傅里叶变换红外光谱、X射线衍射、核磁共振波谱技术对其结构进行表征,并通过脂多糖诱导RAW264.7细胞炎症模型评估其体外抗炎活性及其作用机制。结果:PSPDL的重均分子质量为59.475 kDa,主要由甘露糖、鼠李糖、葡萄糖醛酸、半乳糖醛酸、葡萄糖、半乳糖、阿拉伯糖组成,其物质的量比为1.69∶4.95∶1.04∶21.79∶19.01∶31.68∶19.84,是含有(1→4)-α-D-Glcp的α-吡喃型多糖;能够抑制炎症因子的释放及其相关mRNA的表达,改善氧化应激,下调p38、p-p38、IκB-α、p65和p-p65蛋白的表达水平。结论:PSDPL具有抗炎活性,其作用机制可能与调节炎症相关mRNA表达,调控丝裂原活化蛋白激酶/核转录因子κB信号通路相关,本研究结果可为PSPDL资源的开发与应用提供科学依据。展开更多
基金supported partly by a grant from Shanghai Science and Technology Committee International Collaboration Program (Project No. 055207078)
文摘Objective To investigate in vitro cytotoxicity and oxidative stress response induced by multiwalled carbon nanotubes （MWCNTs）. Methods Cultured macrophages （murine RAW264.7 cells） and alveolar epithelium cells type II （human A549 lung cells） were exposed to the blank control, DNA salt control, and the MWCNTs suspensions at 2.5, 10, 25, and 100 ug/mL for 24 h. Each treatment was evaluated by cell viability, cytotoxicity and oxidative stress. Results Overall, both cell lines had similar patterns in response to the cytotoxicity and oxidative stress of MWCNTs. DNA salt treatment showed no change compared to the blank control. In both cell lines, significant changes at the doses of 25 and 100 ug/mL treatments were found in cell viabilities, cytotoxicity, and oxidative stress indexes. The reactive oxygen species （ROS） generation was also found to be significantly higher at the dose of 10 ug/mL treatment, whereas no change was seen in most of the indexes. The ROS generation in both cell lines went up in minutes, reached the climax within an hour and faded down after several hours. Conclusion Exposure to MWCNTs resulted in a dose-dependent cytotoxicity in cultured RAW264.7 cells and A549 cells, that was closely correlated to the increased oxidative stress.
文摘为解析槲皮万寿菊素、槲皮素与叶黄素单独处理以及联合处理对急性肺损伤的作用机制,以脂多糖诱导构建RAW264.7细胞炎症模型,以一氧化氮(nitric oxide,NO)相对含量为评价指标,采用联合指数法确定槲皮万寿菊素与叶黄素以及槲皮素与叶黄素的最佳复配比例;分析比较槲皮万寿菊素、槲皮素与叶黄素单独及联合处理对RAW264.7细胞中炎症因子(肿瘤坏死因子-α、白细胞介素(interleukin,IL)-1β、IL-6)含量、丙二醛含量、超氧化物歧化酶活性以及谷胱甘肽过氧化物酶活性的影响;采用免疫印迹法测定核因子κB(nuclear factor kappa-B,NF-κB)信号通路中p65、p50以及沉默信息调节因子1(silent information regulator 1,SIRT1)、核因子E2相关因子2(nuclear factor-erythroid 2 related factor 2,Nrf2)和NOD样受体热蛋白结构域相关蛋白3(NOD-like receptor thermal protein domain associated protein 3,NLRP3)的相对表达量。结果表明,槲皮万寿菊素与叶黄素高剂量3∶1(30μg/mL+10μg/mL)复配能够最大程度降低RAW264.7细胞中的NO相对含量。二者单独及联合作用均能通过降低炎症因子、丙二醛含量,提高超氧化物歧化酶和谷胱甘肽还原酶活性,下调NF-κB p65、p50以及NLRP3表达水平并上调SIRT1、Nrf2蛋白相对表达量发挥改善急性肺损伤的作用,且联合处理效果优于单独处理组。
文摘目的:探究叉分蓼多糖(Polygonum divaricatum L. polysaccharides,PSPDL)体外抗炎活性及其作用机制。方法:从叉分蓼中提取多糖,采用高效凝胶渗透色谱、高效液相色谱、傅里叶变换红外光谱、X射线衍射、核磁共振波谱技术对其结构进行表征,并通过脂多糖诱导RAW264.7细胞炎症模型评估其体外抗炎活性及其作用机制。结果:PSPDL的重均分子质量为59.475 kDa,主要由甘露糖、鼠李糖、葡萄糖醛酸、半乳糖醛酸、葡萄糖、半乳糖、阿拉伯糖组成,其物质的量比为1.69∶4.95∶1.04∶21.79∶19.01∶31.68∶19.84,是含有(1→4)-α-D-Glcp的α-吡喃型多糖;能够抑制炎症因子的释放及其相关mRNA的表达,改善氧化应激,下调p38、p-p38、IκB-α、p65和p-p65蛋白的表达水平。结论:PSDPL具有抗炎活性,其作用机制可能与调节炎症相关mRNA表达,调控丝裂原活化蛋白激酶/核转录因子κB信号通路相关,本研究结果可为PSPDL资源的开发与应用提供科学依据。
