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pubmed:abstractText |
We have developed a novel dual-acting maleimide-bearing prodrug that incorporates the anticancer agent doxorubicin and an inhibitor of the P-glycoprotein efflux pump that is over-expressed in multidrug resistant tumor cells. Additionally, the prodrug contains a 1,6-self-immolative spacer coupled to the dipeptide Phe-Lys that acts as a substrate for cathepsin B. The prodrug, once bound through its maleimide moiety to the cysteine-34 group of human serum albumin, was cleaved by cathepsin B and in tumor homogenates demonstrating a release of the anticancer agent doxorubicin and the inhibitor.
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