This study is to prepare and evaluate Pluronics-modified mixed micelle (MM) to deliver polyphenolic myricetin (MYR) across the blood-brain barrier. MYR has been proven to be an effective anticancer agent against glioblastoma cells in our previous studies. However, the poor solubility of MYR limits its access to the brain. In this study, the feasibility of preparing lipid-based MM that combined sodium dodecyl sulphate (SDS) with Pluronic F68 (F68) and Labrasol was investigated. Furthermore, the nonionic surfactant coating technology for the protection of MYR against oxidation, and its attainment in oral bioavailability, was examined. On account of the altered biomaterial properties of F68/SDS-modified lipid-based micelles, myricetin-loaded mixed micelles (MYR-MMs) were prepared by solvent-evaporation method to self-assembly into MMs. The average size of MYR-MMs was 96.3 nm, with negatively charged potential and spherical in shape. The drug loading of MYR-MMs was high with the increased grafting ratio, the more prolonged drug release profile, and more effective killing glioblastoma cells in vitro. Moreover, MYR-MMs showed a higher preference for the brain than free MYR alone, suggesting the novel MMs loaded with MYR could promote absorption and increase relative bioavailability. Taken together, the F68/SDS-modified and Labrasol-modified lipid-based micelles may provide a promising method to deliver polyphenolic compounds across the brain to treat brain tumor.

译文

这项研究旨在制备和评估Pluronics修饰的混合胶束 (MM),以通过血脑屏障传递多酚杨梅素 (MYR)。在我们先前的研究中,MYR已被证明是一种有效的抗胶质母细胞瘤细胞的抗癌剂。然而,MYR的溶解度差限制了它进入大脑。在这项研究中,研究了将十二烷基硫酸钠 (SDS) 与Pluronic F68 (F68) 和Labrasol结合制备基于脂质的MM的可行性。此外,还研究了用于保护MYR免受氧化的非离子表面活性剂涂层技术及其在口服生物利用度中的实现。由于F68/SDS修饰的脂质基胶束的生物材料性质发生了变化,通过溶剂蒸发法制备了载有杨梅素的混合胶束 (myr-mms),以自组装成MMs。Myr-mms的平均尺寸为96.3 nm,具有带负电的电势和球形。Myr-mms的载药量很高,接枝率增加,药物释放曲线延长,体外杀死胶质母细胞瘤细胞更有效。此外,myr-mms比单独的游离MYR表现出更高的大脑偏好,这表明装有MYR的新型MMs可以促进吸收并增加相对生物利用度。综合而言,F68/SDS修饰和Labrasol修饰的基于脂质的胶束可能提供一种有前途的方法,可将多酚类化合物传递到整个大脑以治疗脑肿瘤。

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