ROS‐Responsive Camptothecin Prodrug Nanoparticles for On‐Demand Drug Release and Combination of Chemotherapy and Photodynamic Therapy
作者:Bingyang Chu、Ying Qu、Xinlong He、Ying Hao、Chengli Yang、Yun Yang、Danrong Hu、Fangfang Wang、Zhiyong Qian
DOI:10.1002/adfm.202005918
日期:2020.12
and then triggers locoregional, controllable and on‐demand CPT release, but also exhibits cytotoxic effects on tumor cells. Thus, CPT‐mediated chemotherapy and PPa‐induced photodynamic therapy lead to the combined and enhanced suppression of tumor growth. Accordingly, such laser‐triggered, localized, controllable, and on‐demand drug release systems may provide an alternative option for CPT formulations
在基于纳米药物的癌症治疗中,如何最大程度地减少系统循环中的药物泄漏,同步多种药物的体内命运以及精确控制肿瘤局部区域的药物释放仍然是一项挑战。在这里,开发了一种活性氧(ROS)反应性喜树碱(CPT)前药递送系统(MPEG-(TK-CPT)-PPa),其中CPT和光敏性焦脱镁叶绿素a(PPa)同时结合到同一聚(乙二醇)甲醚(MPEG)通过ROS反应性硫缩酮(TK)和脂质键连接。合成的MPEG-(TK-CPT)-PPa共轭物在溶液中自组装形成纳米颗粒(NPs)(43.6±0.8 nm)。共价结合的前药可防止药物在全身循环中泄漏,并使两种药物的体内分布同步。产生的PPa荧光信号有助于精确追踪和定位肿瘤部位的NP。在成像的指导下,近红外激光在达到最强荧光后局部照射肿瘤组织。PPa产生的ROS不仅裂解TK键,然后触发局部,可控和按需CPT释放,而且对肿瘤细胞表现出细胞毒性作用。因此,CPT介导的化学疗