Polymeric Micellar Delivery of Novel Microtubule Destabilizer and Hedgehog Signaling Inhibitor for Treating Chemoresistant Prostate Cancer
作者:Ruinan Yang、Hao Chen、Dawei Guo、Yuxiang Dong、Duane D. Miller、Wei Li、Ram I. Mahato
DOI:10.1124/jpet.119.256628
日期:2019.9
Castration-resistant prostate cancer that has become resistant to docetaxel (DTX) represents one of the greatest clinical challenges in the management of this malignancy. There is an urgent need to develop novel therapeutic agents to overcome chemoresistance and improve the overall survival of patients. We have designed a novel microtubule destabilizer (2-(4-hydroxy-1 H -indol-3-yl)-1 H -imidazol-4-yl)(3,4,5-trimethoxyphenyl)methanone (QW-296) and combined it with a newly synthesized hedgehog (Hh) signaling pathway inhibitor 2-chloro- N 1-[4-chloro-3-(2-pyridinyl)phenyl]- N 4, N 4- bis(2-pyridinylmethyl)-1,4-benzenedicarboxamide (MDB5) to treat taxane-resistant (TXR) prostate cancer. The combination of QW-296 and MDB5 exhibited stronger anticancer activity toward DU145-TXR and PC3-TXR cells and suppressed tumor colony formation when compared with single-drug treatment. Because these drugs are hydrophobic, we synthesized the mPEG-p(TMC-MBC) [methoxy-poly(ethylene glycol)- block -poly(trimethylene carbonate- co -2-methyl-2-benzoxycarbonyl-propylene carbonate)] copolymer, which could self-assemble into micelles with loading capacities of 8.13% ± 0.75% and 9.12% ± 0.69% for QW-296 and MDB5, respectively. Further, these micelles provided controlled the respective drug release of 58% and 42% release of QW-296 and MDB5 within 24 hours when dialyzed against PBS (pH 7.4). We established an orthotopic prostate tumor in nude mice using stably luciferase expressing PC3-TXR cells. There was maximum tumor growth inhibition in the group treated with the combination therapy of QW-296 and MDB5 in micelles compared with their monotherapies or combination therapy formulated in cosolvent. The overall findings suggest that combination therapy with QW-296 and MDB5 has great clinical potential to treat TXR prostate cancer, and copolymer mPEG-p(TMC-MBC) could serve as an effective delivery vehicle to boost therapeutic efficacy in vivo.
对多西他赛(DTX)产生耐药性的阉割抗性前列腺癌是治疗这种恶性肿瘤的最大临床挑战之一。目前迫切需要开发新型治疗药物来克服化疗耐药性,提高患者的总体生存率。我们设计了一种新型微管脱稳剂(2-(4-羟基-1 H -吲哚-3-基)-1 H -咪唑-4-基)(3,4,5-三甲氧基苯基)甲酮(QW-296),并将其与新合成的刺猬(Hh)信号通路抑制剂 2-chloro- N 1-[4-chloro-3-(2-pyridinyl)phenyl]- N 4、N 4-双(2-吡啶基甲基)-1,4-苯二甲酰胺(MDB5)来治疗对紫杉类药物耐药(TXR)的前列腺癌。与单药治疗相比,QW-296和MDB5的组合对DU145-TXR和PC3-TXR细胞具有更强的抗癌活性,并能抑制肿瘤集落的形成。由于这些药物具有疏水性,我们合成了 mPEG-p(TMC-MBC) [甲氧基-聚(乙二醇)-嵌段-聚(三亚甲基碳酸酯-共-2-甲基-2-苯氧羰基-碳酸丙烯酯)] 共聚物,它可以自组装成胶束,对 QW-296 和 MDB5 的负载能力分别为 8.13% ± 0.75% 和 9.12% ± 0.69%。此外,这些胶束在与 PBS(pH 7.4)透析后的 24 小时内分别控制了 QW-296 和 MDB5 58% 和 42% 的药物释放。我们使用稳定表达荧光素酶的 PC3-TXR 细胞在裸鼠体内建立了前列腺肿瘤。与QW-296和MDB5的单药或共溶剂配制的联合疗法相比,胶束中的QW-296和MDB5联合疗法组对肿瘤生长的抑制最大。总体研究结果表明,QW-296和MDB5联合疗法在治疗TXR前列腺癌方面具有巨大的临床潜力,而共聚物mPEG-p(TMC-MPC)可作为一种有效的给药载体,提高体内疗效。