PEDS Advance Access originally published online on July 2, 2004
Protein Engineering Design and Selection 2004 17(5):433-441; doi:10.1093/protein/gzh055
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Novel RGD lipopeptides for the targeting of liposomes to integrin-expressing endothelial and melanoma cells
1Vectron Therapeutics AG, Rudolf-Breitscheid-Strasse 24, 35037 Marburg, Germany and 2Institut für Molekularbiologie und Tumorforschung, Philipps-Universität, Emil-Mannkopff-Strasse 2, 35033 Marburg, Germany
3 To whom correspondence should be addressed. E-mail: kontermann{at}aol.com
RGD peptides targeting
v-integrins are promising ligands for the generation of vascular targeting agents. We isolated from phage display RGD motif libraries novel high-affinity cyclic RGD peptides by selection on either endothelial or melanoma cells. Although the starting sequences contained only two cysteine residues flanking the RGD motif, several of the isolated peptides possessed four cysteine residues. A high-affinity peptide (RGD10) constrained by only one disulfide bond was used to generate novel lipopeptides composed of a lipid anchor, a short flexible spacer and the peptide ligand conjugated to the spacer end. Incorporation of RGD10 lipopeptides into liposomes resulted in specific and efficient binding of the liposomes to integrin-expressing cells. In vivo experiments applying doxorubicin-loaded RGD10 liposomes in a C26 colon carcinoma mouse model demonstrated improved efficacy compared with free doxorubicin and untargeted liposomes.
Received February 24, 2004; revised May 17, 2004; accepted May 21, 2004.
Edited by Bernd Gutte
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