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为增强抗肿瘤药物的聚合物胶束的肿瘤靶向性递送,本研究基于叶酸修饰的聚-(2-乙基-2-嗯唑啉)-聚乳酸嵌段共聚物和聚-(2-乙基-2-嗯唑啉)-聚乳酸嵌段共聚物,设计并制备了肿瘤细胞表面过表达的叶酸受体的配体叶酸修饰的pH敏感的聚合物胶束,用于包载抗肿瘤药物阿霉素.所制备的载阿霉素的聚合物胶束的粒径约为36 nm,粒径分布较窄,透射电镜观察胶束呈规则的球形,并具有pH敏感的释药行为.此外,体外的细胞摄取、细胞毒性以及荷瘤裸鼠体内的近红外荧光成像的结果均证明了所制备的聚合物胶束增强的肿瘤靶向性,并归因于叶酸受体的介导和胶束pH敏感性的协同作用.因此,靶向叶酸受体的pH敏感胶束在肿瘤靶向递送难溶药物方面具有一定的潜力.“,”In order to enhance the targeted delivery of anticancer drags by polymeric micelles,folic acid (FA),the ligand of folate receptor (FR) over-expressed in the most cancer cells,modified pH-sensitive polymeric micelles were designed and fabricated to encapsulate doxorubicin (DOX) by combination of pH-sensitive amphiphilic polymer poly(2-ethyl-2-oxazoline)-poly(D,L-lactide)with FA-conjugated poly(2-ethyl-2-oxazoline)-poly(D,L-lactide).The prepared micelles were characterized to have about 36 nm in diameter with narrow distribution,well-defined spherical shape observed under TEM and pH-responsive drag release behavior.Moreover,the tumor targeting ability of the FA-modified pH-sensitive polymeric micelles was demonstrated by the cellular uptake,in vitro cytotoxicity to FR-positive KB cells and in vivo real time near-infrared fluorescence imaging in KB tumor-bearing nude mice.The efficient drug delivery by the micelles was ascribed to the synergistic effects of FR-mediated targeting and pH-triggered drug release.In conclusion,the designed FR-targeted pH-sensitive polymeric micelles might be of great potential in tumor targeted delivery of water-insoluble anticancer drags.