Stimuli-responsive nanocarriers have demonstrated their potentials in optimizing chemotherapeutics and anticancer efficacy. In this study, a mixed micelle system (THSP) was prepared by combining reduction-sensitive hyaluronic acid-poly(lactide) (HA-ss-PLA) conjugates and D-α-tocopheryl polyethylene glycol 1000 succinate (TPGS), with objective to achieve multiple functionalities of selective intracellular rapid release, active targeting capability and multidrug resistance reversal. The mixed micelle possessed desirable particle diameter of 124.32 nm and high entrapment efficiency at 87.97%. Importantly, the THSP mixed micelles demonstrated good stability in systemic circulation and rapidly released PTX in intracellular reductive environment. In vitro cellular uptake study and cytotoxicity assay indicated that the mixed micelles effectively increased drug accumulation in A549 cells and Taxol resistant A549/Taxol cells, and inhibited growth of tumor cells. In addition, the redox-responsive THSP micelles preferentially accumulated to the tumor site and improved anticancer drug activity in vivo, with a TIR of 69.08%. It was concluded that redox-sensitive mixed micelles THSP provided a potential vehicle for efficient anticancer drug delivery and enhancement in treating MDR tumor in the future.

译文

刺激响应性纳米载体已证明其在优化化学疗法和抗癌功效方面的潜力。在这项研究中,通过结合还原敏感的透明质酸-聚丙交酯 (HA-ss-PLA) 缀合物和D-α-生育酚聚乙二醇丁二酸酯 (TPGS) 制备了混合胶束系统 (THSP),目的是实现选择性细胞内快速释放的多功能,主动靶向能力和多药耐药逆转。混合胶束具有124.32  nm的理想粒径和87.97% 时的高截留效率。重要的是,THSP混合胶束在体循环中表现出良好的稳定性,并在细胞内还原环境中迅速释放PTX。体外细胞摄取研究和细胞毒性分析表明,混合胶束可有效增加A549细胞和紫杉醇耐药A549/紫杉醇细胞的药物积累,并抑制肿瘤细胞的生长。此外,氧化还原响应的THSP胶束优先积累到肿瘤部位并改善体内的抗癌药物活性,TIR为69.08%。结论是,氧化还原敏感的混合胶束THSP为将来有效的抗癌药物递送和增强MDR肿瘤的治疗提供了潜在的载体。

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