A doxorubicin-CNGRC-peptide conjugate with prodrug properties

Biochemical Pharmacology
Yvette van HensbergenHerbert M Pinedo

Abstract

There is increasing interest in the exploitation of molecular addresses for the targeting of tumor imaging or therapeutic agents. A recent study demonstrated anticancer activity in human xenografts of doxorubicin (DOX)-peptide conjugates targeted to the tumor vascular endothelium, among them DOX coupled to the cyclic pentapeptide CNGRC [Science 279 (1998) 377]. In order to learn more about the mechanism of action of this type of DOX-peptide conjugates, we have studied the interaction of DOX-CNGRC with primary human umbilical cord vein endothelial cells (HUVEC) and tumor cells under defined in vitro conditions. We used a DOX conjugate, in which the cyclic CNGRC peptide, for which an in vivo endothelial address has recently been identified as aminopeptidase N (APN)/CD13, has been coupled via a hydrolysable spacer to the C-14 anthracycline-side chain. First we determined that the t(1/2) of DOX-CNGRC conjugate in human blood was 442 min (at 37 degrees ) allowing sufficient time for endothelial targeting when administered i.v. When cultured cells were exposed for 30 min to DOX-CNGRC a more cytoplasmic localization of fluorescent drug was seen when compared to DOX exposure and intracellular DOX-CNGRC was identified after extraction f...Continue Reading

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