Amphiphilic Phospholipid-Based Riboflavin Derivatives for Tumor Targeting Nanomedicines
作者:Nataliia Beztsinna、Yoanna Tsvetkova、Matthias Bartneck、Twan Lammers、Fabian Kiessling、Isabelle Bestel
DOI:10.1021/acs.bioconjchem.6b00317
日期:2016.9.21
Riboflavin (RF) is an essential vitamin for cellular metabolism. Recent studies have shown that RF is internalized through RF transporters, which are highly overexpressed by prostate and breast cancer cells, as well as by angiogenic endothelium. Here, we present an optimized synthesis protocol for preparing tailor-made amphiphilic phospholipid-based RF derivatives using phosphoramidite chemistry. The prepared RF amphiphile—RfdiC14—can be inserted into liposome formulations for targeted drug delivery. The obtained liposomes had a hydrodynamic size of 115 ± 5 nm with narrow size distribution (PDI 0.06) and a zeta potential of −52 ± 3 mV. In vitro uptake studies showed that RfdiC14-containing liposomes were strongly internalized in HUVEC, PC3, and A431 cells, in a specific and transporter-mediated manner. To assess the RF targeting potential in vivo, an amphiphile containing PEG spacer between RF and a lipid was prepared—DSPE-PEG-RF. The latter was successfully incorporated into long-circulating near-infrared-labeled liposomes (141 ± 1 nm in diameter, PDI 0.07, zeta potential of −33 ± 1 mV). The longitudinal μCT/FMT biodistribution studies in PC3 xenograft bearing mice demonstrated similar pharmacokinetics profile of DSPE-PEG-RF-functionalized liposomes compared to control. The subsequent histological evaluation of resected tumors revealed higher degree of tumor retention as well as colocalization of targeted liposomes with endothelial cells emphasizing the targeting potential of RF amphiphiles and their utility for the lipid-containing drug delivery systems.
核黄素(RF)是细胞代谢所必需的维生素。最新研究表明,RF通过RF转运蛋白进行内化,而前列腺癌和乳腺癌细胞以及血管生成内皮细胞中转运蛋白的表达量非常高。在此,我们介绍了一种优化的合成方案,利用亚磷酰胺化学方法制备定制的基于磷脂的RF衍生物。制备的RF两亲化合物——RfdiC14——可以插入脂质体配方中,用于靶向药物递送。所得脂质体的流体动力学尺寸为115±5 nm,尺寸分布窄(PDI 0.06),Zeta电位为-52±3 mV。体外摄取研究表明,含RfdiC14的脂质体以一种特定且转运蛋白介导的方式在HUVEC、PC3和A431细胞中强烈内化。为了评估RF在体内的靶向潜力,我们制备了一种在RF和脂质之间含有PEG间隔物的两亲化合物——DSPE-PEG-RF。后者成功掺入长循环近红外标记脂质体(直径141±1 nm,PDI 0.07,Zeta电位为-33±1 mV)。在PC3异种移植小鼠中进行的纵向μCT/FMT生物分布研究表明,与对照组相比,DSPE-PEG-RF功能化脂质体的药代动力学特征相似