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RGD-modified PH-sensitive Liposomes For Docetaxel Tumor Targeting.

Minglu Chang, Shanshan Lu, Fang Zhang, Tiantian Zuo, Yuanyuan Guan, T. Wei, W. Shao, Guimei Lin
Published 2015 · Chemistry, Medicine

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Phosphatidylethanolamine-based pH-sensitive liposomes of various compositions have been described as efficient systems for delivery of therapeutic molecules into tumor cells. The aim of this work was to develop a drug delivery system based on pH-sensitive liposomes (PLPs) that were modified with arginine-glycine-aspartic acid (RGD) peptide to enhance the effectiveness of docetaxel treatment. Docetaxel/coumarin-6 loaded PLPs were prepared by the thin-film dispersion method and characterized in detail, including by particle size, polydispersity, zeta potential and drug encapsulation efficiency. In vitro studies using MCF-7, HepG2and A549 cells were employed to investigate cytotoxicity and cellular uptake of the drug solution or docetaxel/coumarin-6 loaded PLPs. The accumulation of 7-nitro-2-1,3-benzoxadiazol-4-yl (NBD)-labeled liposomes in vivo was studied through tumor section imaging of xenograft mouse models of MCF-7 24h after intravenous administration. The particle size of the non-coated or RGD modified PLPs ranged between 146 and 129nm. Drug release in vitro was modestly prolonged and had good pH sensitivity. In the in vitro study, RGD-coated PLPs showed higher cytotoxicity and cellular uptake relative to non-coated ones. The results of the in vivo study showed that RGD-coated PLPs had higher fluorescence, which suggested a more efficient accumulation than normal PLPs in tumors. In conclusion, these results confirmed RGD-modified PLPs as a potential drug delivery system to achieve controlled release and tumor targeting.
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