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    • 26. 发明申请
    • SURFACE-MODIFIED NANOPARTICLES AND METHOD OF MAKING AND USING SAME
    • 表面改性纳米粒子及其制备方法和使用方法
    • WO1996020698A2
    • 1996-07-11
    • PCT/US1996000476
    • 1996-01-04
    • THE BOARD OF REGENTS acting for and on behalf of THE UNIVERSITY OF MICHIGANLEVY, Robert, J.LABHASETWAR, Vinod, D.SONG, Cunxian, S.
    • THE BOARD OF REGENTS acting for and on behalf of THE UNIVERSITY OF MICHIGAN
    • A61K09/51
    • A61K9/5153
    • Biodegradable controlled release nanoparticles as sustained release bioactive agent delivery vehicles include surface modifying agents to target binding of the nanoparticles to tissues or cells of living systems, to enhance nanoparticle sustained release properties, and to protect nanoparticle-incorporated bioactive agents. Unique methods of making small (10 nm to 15 nm, and preferably 20 nm to 35 nm) nanoparticles having a narrow size distribution which can be surface-modified after the nanoparticles are formed is described. Techniques for modifying the surface include a lyophilization technique to produce a physically adsorbed coating and epoxy-derivatization to functionalize the surface of the nanoparticles to covalently bind molecules of interest. The manoparticles may also comprise hydroxy-terminated or epoxide-terminated and/or activated multiblock copolymers, having hydrophobic segments which may be polycaprolactone and hydrophilic segments. The nanoparticles are useful for local intravascular administration of smooth muscle inhibitors and antithrombogenic agents as part of interventional cardiac or vascular catheterization such as a balloon angioplasty procedure; direct application to tissues and/or cells for gene therapy, such as the delivery of osteotropic genes or gene segments into bone progenitor cells; or oral administration in an enteric capsule for delivery of protein/peptide based vaccines.
    • 作为持续释放的生物活性剂递送载体的可生物降解的控制释放纳米颗粒包括靶向纳米颗粒与生物体系的组织或细胞的结合的表面改性剂,以增强纳米颗粒持续释放性质,并保护纳米颗粒引入的生物活性剂。 描述了在形成纳米颗粒之后可以进行表面改性的具有窄尺寸分布的小(10nm至15nm,优选20nm至35nm)纳米颗粒的独特方法。 用于改性表面的技术包括冷冻干燥技术以产生物理吸附的涂层和环氧衍生化,以官能化纳米颗粒的表面以共价结合感兴趣的分子。 人造粒体还可包含羟基封端或环氧化物封端和/或活化的多嵌段共聚物,其具有可以是聚己内酯和亲水链段的疏水链段。 纳米颗粒可用于局部血管内施用平滑肌抑制剂和抗血栓形成剂,作为介入性心脏或血管导管插入术的一部分,例如球囊血管成形术程序; 直接应用于用于基因治疗的组织和/或细胞,例如将骨质基因或基因片段递送到骨祖细胞中; 或用于输送蛋白质/肽基疫苗的肠溶胶囊中的口服给药。