Ultrasound-Responsive Nanoparticulate for Selective Amplification of Chemotherapeutic Potency for Ablation of Solid Tumors
作者:Jing Xia、Jinyun Wang、Xiang Wang、Ming Qian、Liuwei Zhang、Qixian Chen
DOI:10.1021/acs.bioconjchem.8b00626
日期:2018.10.17
Precision medicine requests preferential transportation of the pharmaceutical substances to the pathological site and impartation of localized therapeutic activities to the targeted cells. To accomplish this goal, we attempted a facile nanoscaled ultrasound-responsive delivery system, characterized by doxorubicin assembled with an amphiphilic copolymer (multiple of hydrophobic stearic segments tethered onto the hydrophilic pullulan backbone through ultrasound-labile oxyl-alkylhydroxylamine linkage). As a consequence of the strategically installed ultrasound-labile oxyl-alkylhydroxylamine linkage to elicit the tailored segregation of the hydrophilic pullulan and the hydrophobic stearic segments upon ultrasound impetus, the constructed nanoscaled self-assembly presented distinctive structural destabilization behaviors and afforded spatiotemporal controlled liberation of the cytotoxic drugs. It is worthy to note that the ultrasound was determined to markedly lower the IC50 of the proposed system from over 10 μg/mL to 2.33 μg/mL (approximate 4-fold), thereby serving as a facile impetus to amplify the cytotoxic potency of the proposed drug delivery vehicles. Furthermore, drastic tumor ablation was validated by dosage of the proposed doxorubicin delivery system to T41 tumor-bearing mice accompanied by the tumor-localized ultrasound impetus, while no observable adverse side effect was confirmed. Therefore, the results advocated our ultrasound-responsive delivery vehicle as a tempting strategy for precise spatiotemporal control of the release of the drug cargo, thus affording selectively amplified cytotoxic potency to the ultrasound-imposed site, which should be highlighted as important progress toward precision medicine.
精准医疗要求将药物优先输送到病理部位,并向靶细胞传递局部治疗活性。为了实现这一目标,我们尝试了一种简便的纳米级超声响应给药系统,该系统的特点是多柔比星与两亲共聚物(多个疏水性硬脂段通过超声标记的草酰基-烷基羟胺连接到亲水性拉普兰骨架上)组装在一起。由于策略性地安装了超声标记的草酰基-烷基羟胺连接,从而在超声推动下引起亲水性拉普兰和疏水性硬脂段的定制分离,所构建的纳米级自组装呈现出独特的结构失稳行为,并提供了时空可控的细胞毒性药物释放。值得注意的是,经测定,超声可将拟议系统的 IC50 从 10 μg/mL 以上明显降低到 2.33 μg/mL(约 4 倍),从而成为放大拟议药物递送载体细胞毒性效力的便捷动力。此外,通过对 T41 肿瘤小鼠施用拟议的多柔比星给药系统,并在肿瘤定位超声波的推动下,验证了肿瘤的剧烈消融,同时证实没有观察到任何不良副作用。因此,研究结果证明,我们的超声响应递送载体是精确控制药物释放时空的诱人策略,从而有选择性地放大超声作用部位的细胞毒性效力,这应被视为精准医疗的重要进展。