Enhanced heparan sulfate proteoglycan-mediated uptake of cell-penetrating peptide-modified liposomes |
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Authors: | C?Marty C?Meylan H?Schott K?Ballmer-Hofer Email author" target="_blank">R?A?SchwendenerEmail author |
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Institution: | (1) Biomolecular Research, Molecular Cell Biology, Paul Scherrer Institut, 5232 Villingen-PSI, Switzerland;(2) Institute of Organic Chemistry, Eberhard-Karls University, Auf der Morgenstelle 18, 72076 Tübingen, Germany |
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Abstract: | Protein transduction domains (PTDs) are used to enhance cellular uptake of drugs, proteins, polynucleotides
or liposomes. In this study, functionalized Antennapedia (Antp, aa 43–-58) and HIV Tat (aa 47–57)
peptides were coupled to small unilamellar liposomes via thiol-maleimide linkage. Modified liposomes showed higher
uptake into a panel of cell lines including tumor and dendritic cells than unmodified control liposomes. Liposome
uptake was time and concentration dependent as analyzed by flow cytometry and live-cell microscopy. At least 100
PTD molecules per small unilamellar liposome (100 ± 30 nm) were necessary for efficient translocation into
cells. Cellular uptake of PTD-modified liposomes was 15- to 25-fold increased compared to unmodified liposomes and
was inhibited by preincubation of liposomes with heparin. Glycosaminoglycan-deficient CHO cells showed dramatically
reduced cell association of PTD-modified liposomes, confirming the important role of heparan sulfate proteoglycans
in PTD-mediated uptake. Antp-liposomes used as carriers of the cytotoxic drug
N4-octadecyl-1- -D-arabinofuranosylcytosine-(5 - 5 )-3 -C-ethinylcytidine
showed a reduction of the IC50 by 70% on B16F1 melanoma cells compared with unmodified
liposomes. PTD-functionalized liposomes, particularly Antp-liposomes, represent an interesting novel carrier
system for enhanced cell-specific delivery of a large variety of liposome-entrapped molecules.Received 16 April 2004; received after revision 13 May 2004; accepted 25 May 2004 |
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Keywords: | Antennapedia HIV-Tat peptide-liposome heparan sulfate proteoglycan cytotoxic liposome |
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