Mixed micelles containing poly(L-histidine-co-phenylalanine)-poly(ethylene glycol) block copolymer and poly(L-lactic acid)-poly(ethylene glycol) block copolymer are a pH-sensitive drug carrier that release the drug in an acidic microenvironment, but not in the blood. Since the microenvironment of solid tumors is acidic, these mixed micelles are useful for treating cancer, including those cancers exhibiting multidrug resistance. Targeting ligands, such as folate, can also be attached to the mixed micelles for enhancing drug delivery into cells. Methods of treating a warm-blooded animal with such a drug are disclosed.
含有聚(
L-组氨酸-co-苯丙
氨酸)-聚
乙二醇嵌段共聚物和聚(
L-乳酸)-聚
乙二醇嵌段共聚物的混合胶束是一种pH敏感的药物载体,可以在酸性微环境中释放药物,但不会在血液中释放。由于固体肿瘤的微环境是酸性的,因此这些混合胶束对于治疗癌症,包括表现出多药耐药性的癌症,非常有用。靶向
配体,如叶酸,也可以附着在混合胶束上,以增强药物输送到细胞内。公开了使用这种药物治疗温血动物的方法。