聚合物胶束作为新型药物传递系统可以提高疏水性药物的溶解性并具有良好的生物相容性和稳定性。本研究通过合成heparosan多糖-维生素E琥珀酸酯(heparosan-adipic dihydrazide-vitamin E succinate,KV)载体,利用核磁共振氢谱(1~H NMR)对...聚合物胶束作为新型药物传递系统可以提高疏水性药物的溶解性并具有良好的生物相容性和稳定性。本研究通过合成heparosan多糖-维生素E琥珀酸酯(heparosan-adipic dihydrazide-vitamin E succinate,KV)载体,利用核磁共振氢谱(1~H NMR)对其进行结构确证。以疏水性抗肿瘤药多柔比星(doxorubicin,DOX)为模型药物,制备载DOX的KV聚合物胶束(DOX/KV),并对其进行表征。结果表明,胶束形貌为球形,粒径为140～150 nm,zeta电位为-20 m V左右,包封率为80%左右,载药量在10%～15%之间,并且具有良好的缓释行为。选择MGC80-3肿瘤细胞和COS7正常细胞考察体外细胞毒性和细胞摄取情况。体外细胞毒性结果显示,空白胶束对两种细胞几乎没有毒性,载药胶束对MGC80-3细胞的细胞毒性要大于COS7细胞。从细胞摄取考察也可以看出,载药胶束对MGC80-3细胞的摄取量更高。综上,KV可以很好地包载DOX,并且可以提高其对癌细胞的选择性,具有良好的抗肿瘤活性。展开更多
Heparosan is a natural precursor of heparin biosynthesis in mammals. It is stable in blood circulation but can be degraded in lysosomes, showing good biocompatibility and long circulation features. So heparosan can be...Heparosan is a natural precursor of heparin biosynthesis in mammals. It is stable in blood circulation but can be degraded in lysosomes, showing good biocompatibility and long circulation features. So heparosan can be designed as anticancer drug carriers to increase tumor selectivity and improve the therapeutic effect. A novel redox-sensitive heparosancystamine-vitamin E succinate(KSV) micelle system was constructed for intracellular delivery of doxorubicin(DOX). Simultaneously, the redox-insensitive heparosan-adipic acid dihydrazide-vitamin E succinate copolymer(KV) was synthesized as control. DOX-loaded micelles(DOX/KSV) with an average particle size of 90–120 nm had good serum stability and redox-triggered depolymerization. In vitro drug release test showed that DOX/KSV micelles presented obvious redox-triggered release behavior compared with DOX/KV. Cytotoxicity and cell uptake were investigated using MGC80-3 tumor cells and COS7 fibroblast-like cells. The cell survival rate of blank micelles was more than 90%, and the cytotoxicity of DOX/KSV in MGC80-3 cells was higher than in COS7 cells, indicating that the carrier has better biocompatibility and less toxicity side effect. The cytotoxicity of DOX/KSV against MGC80-3 cells was significantly greater than that of free DOX and DOX/KV. Furthermore, compared with DOX/KV in MGC80-3 cells, DOX/KSV micelles uptook more anticancer drugs and then released DOX faster into the cell nucleus. The micelles were endocytosed by multiple pathways, but clathrin-mediated endocytosis was the main pathway. Therefore, heparosan polysaccharide could be a potential option as anticancer carrier for enhancing efficacy and mitigating toxicity.展开更多
目的合成Her-2环肽修饰的Heparosan多糖聚合物,制备阿霉素(doxorubicin,DOX)靶向聚合物胶束,并对其体外理化性质和靶向性进行评价。方法通过酰胺反应将Her-2环肽连接到Heparosan多糖-胱氨-维生素E琥珀酸酯(heparosan-cystamine-vitamin ...目的合成Her-2环肽修饰的Heparosan多糖聚合物,制备阿霉素(doxorubicin,DOX)靶向聚合物胶束,并对其体外理化性质和靶向性进行评价。方法通过酰胺反应将Her-2环肽连接到Heparosan多糖-胱氨-维生素E琥珀酸酯(heparosan-cystamine-vitamin E succinate,KSV)聚合物上,合成两亲性靶向聚合物(Her-2 peptide-heparosan-cystamine-vitamin E succinate,PKSV),并包载阿霉素制备还原敏感型主动靶向的给药系统(DOX/PKSV),考察胶束粒径、包封率、体外释放等制剂学性质,同时,选择Her-2受体低表达的MCF-7细胞和Her-2受体高表达的SK-BR-3细胞进行体外肿瘤靶向性进行评价。结果经Her-2环肽修饰的DOX/PKSV靶向聚合物胶束的为粒径约200 nm的均匀的球形粒子,zeta电位为(-23.84±1.43)mV,载药量为(11.22±1.04)%,具有良好的血清稳定性和还原敏感释药特性。体外细胞实验表明,相比于DOX/KSV胶束,DOX/PKSV胶束对SK-BR-3细胞表现出更强的细胞毒性和细胞摄取。结论DOX/PKSV胶束能够提高肿瘤靶向性,为Heparosan多糖的主动靶向递送系统的设计提供借鉴。展开更多
文摘聚合物胶束作为新型药物传递系统可以提高疏水性药物的溶解性并具有良好的生物相容性和稳定性。本研究通过合成heparosan多糖-维生素E琥珀酸酯(heparosan-adipic dihydrazide-vitamin E succinate,KV)载体,利用核磁共振氢谱(1~H NMR)对其进行结构确证。以疏水性抗肿瘤药多柔比星(doxorubicin,DOX)为模型药物,制备载DOX的KV聚合物胶束(DOX/KV),并对其进行表征。结果表明,胶束形貌为球形,粒径为140～150 nm,zeta电位为-20 m V左右,包封率为80%左右,载药量在10%～15%之间,并且具有良好的缓释行为。选择MGC80-3肿瘤细胞和COS7正常细胞考察体外细胞毒性和细胞摄取情况。体外细胞毒性结果显示,空白胶束对两种细胞几乎没有毒性,载药胶束对MGC80-3细胞的细胞毒性要大于COS7细胞。从细胞摄取考察也可以看出,载药胶束对MGC80-3细胞的摄取量更高。综上,KV可以很好地包载DOX,并且可以提高其对癌细胞的选择性,具有良好的抗肿瘤活性。
基金We are grateful for the financial support from National Natural Science Foundation of China(81503007 and 21574059)Research Project of Wuxi Health and Family Planning Commission(Q201843)+1 种基金Natural Science Foundation of Jiangsu Province(BK20170202)the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions(PPZY2015B146).
文摘Heparosan is a natural precursor of heparin biosynthesis in mammals. It is stable in blood circulation but can be degraded in lysosomes, showing good biocompatibility and long circulation features. So heparosan can be designed as anticancer drug carriers to increase tumor selectivity and improve the therapeutic effect. A novel redox-sensitive heparosancystamine-vitamin E succinate(KSV) micelle system was constructed for intracellular delivery of doxorubicin(DOX). Simultaneously, the redox-insensitive heparosan-adipic acid dihydrazide-vitamin E succinate copolymer(KV) was synthesized as control. DOX-loaded micelles(DOX/KSV) with an average particle size of 90–120 nm had good serum stability and redox-triggered depolymerization. In vitro drug release test showed that DOX/KSV micelles presented obvious redox-triggered release behavior compared with DOX/KV. Cytotoxicity and cell uptake were investigated using MGC80-3 tumor cells and COS7 fibroblast-like cells. The cell survival rate of blank micelles was more than 90%, and the cytotoxicity of DOX/KSV in MGC80-3 cells was higher than in COS7 cells, indicating that the carrier has better biocompatibility and less toxicity side effect. The cytotoxicity of DOX/KSV against MGC80-3 cells was significantly greater than that of free DOX and DOX/KV. Furthermore, compared with DOX/KV in MGC80-3 cells, DOX/KSV micelles uptook more anticancer drugs and then released DOX faster into the cell nucleus. The micelles were endocytosed by multiple pathways, but clathrin-mediated endocytosis was the main pathway. Therefore, heparosan polysaccharide could be a potential option as anticancer carrier for enhancing efficacy and mitigating toxicity.
文摘目的合成Her-2环肽修饰的Heparosan多糖聚合物,制备阿霉素(doxorubicin,DOX)靶向聚合物胶束,并对其体外理化性质和靶向性进行评价。方法通过酰胺反应将Her-2环肽连接到Heparosan多糖-胱氨-维生素E琥珀酸酯(heparosan-cystamine-vitamin E succinate,KSV)聚合物上,合成两亲性靶向聚合物(Her-2 peptide-heparosan-cystamine-vitamin E succinate,PKSV),并包载阿霉素制备还原敏感型主动靶向的给药系统(DOX/PKSV),考察胶束粒径、包封率、体外释放等制剂学性质,同时,选择Her-2受体低表达的MCF-7细胞和Her-2受体高表达的SK-BR-3细胞进行体外肿瘤靶向性进行评价。结果经Her-2环肽修饰的DOX/PKSV靶向聚合物胶束的为粒径约200 nm的均匀的球形粒子,zeta电位为(-23.84±1.43)mV,载药量为(11.22±1.04)%,具有良好的血清稳定性和还原敏感释药特性。体外细胞实验表明,相比于DOX/KSV胶束,DOX/PKSV胶束对SK-BR-3细胞表现出更强的细胞毒性和细胞摄取。结论DOX/PKSV胶束能够提高肿瘤靶向性,为Heparosan多糖的主动靶向递送系统的设计提供借鉴。
