| 摘要 |
The present invention provides a liposomal composition for targeted delivery of drugs. The composition comprises poloxamer molecules and liposomes encapsulating one or more delivery agents. At above the critical micellar temperature of the poloxamer, a fraction of the poloxamer molecules form micelles and another fraction becomes incorporated into the liposome surface, thereby inhibiting their adhesion to cells. At a temperature below the critical micellar temperature, the poloxamer molecules dissociate into monomers allowing the liposomes to adhere to adjacent cells and effecting retention of the liposomes in the surrounding tissue. A method is provided for delivery of agents to target site comprising administering the composition to an individual and cooling the target site to cause retention of the liposomes at or near the target site.
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