Salvianolic acid B(Sal B) is an active component of traditional Chinese medicine Salvia miltiorrhiza and is used to treat vascular diseases. To better understand its mechanism, the antioxidant capacities of Sal B was evaluated with human endothelial cells under oxidative stress. Human endothelial cells were pretreated with Sal B for 12 h followed by hydrogen peroxide for another 12 h. Production of reactive oxygen species (ROS), activities of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX), and concentration of glu-tathione were measured. Protective effect of Sal B on the endothelial cells from hydrogen peroxide-induced damage was observed, and ROS production in the cells was found significantly inhibited. Sal B remarkably enhanced the activities of antioxidant enzymes SOD, CAT and GPX. Furthermore, Sal B up-regulated the intracellular glu-tathione concentration. The results indicate that Sal B protected endothelial cells from oxidative stress by improving the redox status of the cells through enhancing the antioxidant enzyme activities and increasing the reductive glu-tathione concentration after the oxidative challenge.
重组人干扰素(Recombinant human interferon,rhuIFN)是一类抗病毒、抗肿瘤和多发性硬化调节免疫的重要生物制品。自1957年发现干扰素以来,人们不断采用新技术对干扰素分子结构进行改造,先后研发了原型干扰素、保守干扰素、聚乙二醇修饰干扰素等几十个品种,目前已批准十余个一类新药干扰素上市。本文在回顾干扰素药物历史的基础上,对化学修饰改型干扰素、融合干扰素、杂合干扰素等的研究进展作一综述。
