申请人:——
公开号:US20010006817A1
公开(公告)日:2001-07-05
The present invention provides improved cell delivery compositions. In particular, the invention provides biocompatible endosomolytic agents. In a preferred embodiment, the endosomolytic agents are also biodegradable and can be broken down within cells into components that the cells can either reuse or dispose of. Preferred endosomolytic agents include cationic polymers, particularly those comprised of biomolecules, such as histidine, polyhistidine, polylysine or any combination thereof. Other exemplary endosomolytic agents include, but are not limited to, other imidazole containing compounds such as vinylimidazole and histamine. More particularly preferred are those agents having multiple proton acceptor sites and acting as a “proton sponge”, disrupting the endosome by osmolytic action. In preferred embodiments, the endosomolytic agent comprises a plurality of proton acceptor sites having pKas within the range of 4 to 7, which endosomal lysing component is polycationic at pH 4. The present invention also contemplates the use of these endosomolytic agents as delivery agents by complexation with the desired compound to be delivered. Thus, the present invention also acts as a cell delivery system comprising an endosomolytic agent, a delivery agent, and a compound to be delivered.
本发明提供了改进的细胞递送组合物。具体而言,本发明提供了生物相容的内体溶解剂。在一个优选实施例中,内体溶解剂也是可生物降解的,可以在细胞内分解为细胞可以重新利用或处置的组分。优选的内体溶解剂包括阳离子聚合物,特别是由生物分子组成的聚组氨酸,如组氨酸、多组氨酸、多赖氨酸或二者的任意组合。其他示例性的内体溶解剂包括但不限于其他含咪唑醇基的化合物,如乙烯咪唑和组胺。更具体优选的是那些具有多个质子受体位点并作为“质子海绵”起作用的剂,通过渗透调节作用破坏内体。在优选实施例中,内体溶解剂包括具有pKa在4到7范围内的多个质子受体位点的内体溶解组分,在pH 4时为多阳离子性的。本发明还考虑了将这些内体溶解剂作为递送剂通过与要递送的化合物结合的复合物的使用。因此,本发明还作为一个细胞递送系统,包括一个内体溶解剂、一个递送剂和一个要递送的化合物。