Therapeutic Effect of Reticuloendothelial System(RES)-Avoiding Liposomes Containing a Phospholipid Analogue of 5-Fluorouracil, Dipalmitoylphosphatidylfluorouridine, in Meth A Sarcoma-Bearing Mice.

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Reticuloendothelial system (RES)-avoiding liposomes are known to accumulate in tumor tissues due to passive targeting. Dipalmitoylphosphatidylfluorouridine (DPPF), a potent antitumor agent readily incorporated into the lipid bilayer, was embedded in RES-avoiding liposomes modified with a uronic acid derivative, palmityl-D-glucuronide (PGlcUA). The therapeutic effect of DPPF in PGlcUA-liposomes was examined in tumor-bearing mice. Free or liposomal DPPF was injected intravenously into BALB/c mice bearing subcutaneously implanted Meth A sarcomas. The RES-avoiding liposomal formulation using PGlcUA was effective in reducing tumors, and prolonging survival time compared with free DPPF and also DPPF in conventional liposomes. Therefore, PGlcUA-liposomes might be of practical use as drug carriers for anticancer agents, especially their derivatives for embedding in liposomal membranes.

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