The medical grade poly(vinylmethyl siloxane)(PVMS) and silica filled PVMS were crosslinked with benzoyl peroxide(BPO). The glass transition of the crosslinked silicone rubber was evaluated by measurment of thermally s...The medical grade poly(vinylmethyl siloxane)(PVMS) and silica filled PVMS were crosslinked with benzoyl peroxide(BPO). The glass transition of the crosslinked silicone rubber was evaluated by measurment of thermally stimulated current(TSC). The releasing rate of 1 norgestrel(LNG) through the membrane of the vulcanized silicone rubber in saturated physiological salt solution and that from the intrauterine device(IUD) were determined. The results showed that the drug deli very behavour was influenced by the structure of PVMS molecules which were controlled by the content of BPO and silica used in vulcanization of PVMS. The burst effect at first stage of drug delivery was observed probably due to the interaction between LNG and macromolecules. The releasing curve of LNG from IUD could be kept constant for period of half a year.展开更多
文摘目的:运用网络药理学方法研究灵芝多糖(ganoderma lucidum polysaccharide,GLP)治疗糖尿病足(diabetic foot,DF)的作用机制。方法:通过查阅文献、TCMSP、PharmMapper数据库获得GLP化学成分信息及其作用靶点。通过GeneCards和OMIM数据库检索DF相关靶点。基于在线软件Venny 2.1获得二者交集靶点。运用Cytoscape软件构建“成分-靶点-疾病”网络图。使用STRING数据库和Cytoscape软件进行蛋白互作(PPI)网络分析,根据度值筛选出核心靶点。结合DAVID数据库对核心靶点进行基因本体(GO)功能和京都基因与基因组百科全书(KEGG)分析。结果:GLP与DF的交集靶点有98个,其中非受体酪氨酸蛋白激酶(SRC)、热休克蛋白90α编码基因(HSP90AA1)、HRas原癌基因(HRAS)、Ras同源基因家族成员A(RHOA)、丝氨酸/苏氨酸蛋白激酶(AKT1)、表皮生长因子受体(EGFR)等20个靶点可能是GLP治疗DF的关键靶点,参与癌症通路(pathways in cancer)、血管内皮生长因子(VEGF)、丝裂原活化蛋白激酶(MAPK)、脂质和动脉粥样硬化(lipid and atherosclerosis)、糖尿病并发症中的晚期糖基化终末产物及其受体(AGE-RAGE)等关键通路。结论:GLP在治疗DF方面显示出多靶点、多通路协同作用的特点,这将为中药多糖治疗糖尿病足研究提供有益的参考。
文摘The medical grade poly(vinylmethyl siloxane)(PVMS) and silica filled PVMS were crosslinked with benzoyl peroxide(BPO). The glass transition of the crosslinked silicone rubber was evaluated by measurment of thermally stimulated current(TSC). The releasing rate of 1 norgestrel(LNG) through the membrane of the vulcanized silicone rubber in saturated physiological salt solution and that from the intrauterine device(IUD) were determined. The results showed that the drug deli very behavour was influenced by the structure of PVMS molecules which were controlled by the content of BPO and silica used in vulcanization of PVMS. The burst effect at first stage of drug delivery was observed probably due to the interaction between LNG and macromolecules. The releasing curve of LNG from IUD could be kept constant for period of half a year.