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pH-sensitive pluronic micelles combined with oxidative stress amplification for enhancing multidrug resistance breast cancer therapy.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-14 , DOI: 10.1016/j.jcis.2020.01.029
Xu Cheng 1 , Xiaoli Zeng 1 , Yan Zheng 1 , Qin Fang 1 , Xin Wang 1 , Jun Wang 1 , Rupei Tang 1
Affiliation  

Multidrug resistance (MDR) is one of the major obstacles to clinical cancer chemotherapy. Herein, we designed new pH-sensitive pluronic micelles with the synergistic effects of oxidative therapy and MDR reversal. Pluronic (P123) was modified with α-tocopheryl succinate (α-TOS) via an acid-labile ortho ester (OE) linkage to give a pH-sensitive copolymer (POT). Self-assembled POT micelles exhibited desirable size (~80 nm), excellent anti-dilution ability, high drug loading (~85%), acid-triggered degradation and drug release behaviours. In vitro cell experiments verified that POT micelles could significantly reverse MDR through suppressing the function of drug effluxs mediated by P123 and induce more reactive oxygen species (ROS) generation mediated by α-TOS, resulting in enhanced cytotoxicity and apoptosis in MDR cells. In vivo studies further revealed that DOX-loaded POT micelles (POT-DOX) possessed the highest drug accumulation (3.03% ID/g at 24 h) and the strongest tumour growth inhibition (TGI 83.48%). Pathological analysis also indicated that POT-DOX could induce more apoptosis or necrosis at the site of tumour without distinct damage to normal tissues. Overall, these smart POT micelles have great potential as promising nano-carriers for MDR reversal and cancer treatment.

中文翻译:

pH敏感的绒毛胶束与氧化应激放大相结合,可增强对多药耐药性的乳腺癌治疗。

多药耐药性(MDR)是临床癌症化学疗法的主要障碍之一。在本文中,我们设计了具有氧化疗法和MDR逆转的协同效应的新型pH敏感普卢尼克胶束。通过对酸不稳定的原酸酯(OE)键,用α-生育酚琥珀酸酯(α-TOS)对Pluronic(P123)进行改性,得到pH敏感共聚物(POT)。自组装的POT胶束具有理想的尺寸(〜80 nm),出色的抗稀释能力,高载药量(〜85%),酸触发的降解和药物释放行为。体外细胞实验证明,POT胶束可通过抑制P123介导的药物外流功能来显着逆转MDR,并诱导α-TOS介导的更多活性氧(ROS)产生,从而增强MDR细胞的细胞毒性和凋亡。体内研究进一步表明,载有DOX的POT胶束(POT-DOX)具有最高的药物蓄积(24 h时为3.03%ID / g)和最强的肿瘤生长抑制作用(TGI 83.48%)。病理分析还表明,POT-DOX可以在肿瘤部位诱导更多的细胞凋亡或坏死,而对正常组织没有明显的损害。总体而言,这些智能的POT胶束具有巨大的潜力,可作为有望逆转MDR和治疗癌症的纳米载体。
更新日期:2020-01-14
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