Wang Yifan, He Liang, Yu Bing, Chen Yang, Shen Youqing, Cong Hailin
Institute of Biomedical Materials and Engineering, College of Materials Science and Engineering, College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China.
Laboratory for New Fiber Materials and Modern Textile, Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, China.
Polymers (Basel). 2018 Nov 15;10(11):1272. doi: 10.3390/polym10111272.
In this paper, we reported a pH responsive nano drug delivery system (NDDS) based on ZnO quantum dots (QDs) for controlled release of drugs. Zwitterionic poly(carboxybetaine methacrylate) (PCBMA) and poly(2-(dimethylamino) ethyl methacrylate) (PDMAEMA) were introduced to modify ZnO QDs, which can help enhance water stability, increase blood circulation time, and promote endocytosis. After tuning of PCBMA/PDMAEMA ratios, the ZnO@P(CBMADMAEMA) nanoplatform shows a sensitive switch from strong protein adsorption resistance (with negatively charged surface) at physiological pH to strong adhesion to tumor cell membranes (with positively charged surface) at the slightly acidic extracellular pH of tumors. Anti-cancer drug, Doxorubicin (DOX), molecules were demonstrated to be successfully loaded to ZnO@P(CBMADMAEMA) with a relatively large drug loading content (24.6%). In addition, ZnO@P(CBMADMAEMA) loaded with DOX can achieve lysosomal acid degradation and release of DOX after endocytosis by tumor cells, resulting in synergistic treatment of cancer, which is attributed to a combination of the anticancer effect of Zn and DOX.
在本文中,我们报道了一种基于氧化锌量子点(QDs)的pH响应型纳米药物递送系统(NDDS),用于药物的控释。引入两性离子聚(甲基丙烯酸羧酸甜菜碱)(PCBMA)和聚(甲基丙烯酸2-(二甲氨基)乙酯)(PDMAEMA)对氧化锌量子点进行修饰,这有助于提高其水稳定性、延长血液循环时间并促进内吞作用。通过调整PCBMA/PDMAEMA的比例,ZnO@P(CBMADMAEMA)纳米平台表现出一种敏感的转变,即从生理pH下具有强抗蛋白质吸附能力(表面带负电荷)转变为在肿瘤微酸性细胞外pH下对肿瘤细胞膜具有强粘附性(表面带正电荷)。抗癌药物阿霉素(DOX)分子被证明能够以相对较高的载药量(24.6%)成功负载到ZnO@P(CBMADMAEMA)上。此外,负载DOX的ZnO@P(CBMADMAEMA)在被肿瘤细胞内吞后可实现溶酶体酸性降解并释放DOX,从而实现癌症的协同治疗,这归因于锌和DOX的抗癌作用的结合。
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