Smart nanocarrier from norbornene based triblock copolymers for the sustained release of multi-cancer drugs
作者:Vijayakameswara Rao N、Himadri Dinda、Parvathy Venu、Jayasri Das Sarma、Raja Shunmugam
DOI:10.1039/c4ra07549h
日期:——
A stimuli responsive, multi-anticancer drug derived nanocarrier has been synthesized by conjugating doxorubicin, chlorambucil, folate to the backbone of a norbornene polymer. Monomers namely NOR–DOX (mono 1), NOR–CHO (mono 2), and norbornene grafted poly(ethyleneglycol)–folate NOR–PEG–FOL (mono 3), are connected to the norbornene backbone by ester linkers to demonstrate the pH responsive capabilities. The complete chemical and biological properties of the nanocarriers, intended for combination cancer chemotherapy, are discussed. This nanocarrier, DOX–CHO–FOL is designed in such a way that doxorubicin, and chlorambucil, are both conjugated to the same polymer. The presence of the PEG–FOL functionality makes the system water-soluble as well as site-specific. The nanocarrier capabilities are tested by dynamic light scattering, scanning electron and transmission electron microscopies. The drug release profile shows the importance of having the ester linker which helps the drug at the mild acidic conditions resembling the pH of the cancerous cells. Confocal microscope studies confirm the cell internalization of the nanocarrier. MTT assay against 4T cells suggests the importance of the nanocarrier in the anticancer efficacy.
合成了一种刺激响应型的多抗癌药物衍生纳米载体,通过将多柔比星、氯阿霉素和叶酸共轭到诺尔本烯聚合物的骨架上。单体包括NOR–DOX(单体1)、NOR–CHO(单体2)和诺尔本烯接枝聚乙二醇–叶酸(NOR–PEG–FOL,单体3),通过酯键将其连接到诺尔本烯骨架上,以展示其pH响应能力。文中讨论了这种针对组合癌症化疗的纳米载体的完整化学和生物特性。这个纳米载体DOX–CHO–FOL的设计方式使得多柔比星和氯阿霉素都共轭到同一聚合物上。PEG–FOL功能的存在使得该系统既水溶性又具有靶向特性。通过动态光散射、扫描电子显微镜和透射电子显微镜测试纳米载体的能力。药物释放曲线显示了酯键的重要性,该键在模拟癌细胞pH的弱酸性条件下有助于药物释放。共聚焦显微镜研究确认了纳米载体的细胞内化。针对4T细胞的MTT实验表明纳米载体在抗癌疗效中的重要性。