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• W2079730270 abstract "pH-sensitive liposomes are designed to promote efficient release of entrapped agents in response to low pH. In this study, novel pH-sensitive liposomes consisting of cationic/anionic lipid combinations are evaluated for intracellular drug and gene delivery. First, liposomes composed of egg phosphatidylcholine, dimethyldioctadecylammonium bromide (DDAB), cholesteryl hemisuccinate (CHEMS), and Tween-80 (25:25:49:1, mol/mol) were shown to stably entrap calcein at pH 7.4 and undergo rapid content release and irreversible aggregation under acidic pH. Compared to pH-sensitive liposomes incorporating dioleoylphosphatidylethanolamine, these liposomes showed improved retention of pH-sensitivity in the presence of serum. The folate receptor (FR), which is amplified in a wide variety of human tumors, could be targeted by incorporating 0.1 mol% folate-polyethyleneglycol-phosphatidylethanolamine (f-PEG-PE) into liposomes. f-PEG-PE has been shown to facilitate FR-mediated endocytosis of liposomes into KB human oral cancer cells, which express amplified FR. FR-targeted pH-sensitive liposomes produced increased cytosolic release of entrapped calcein, as shown by fluorescence microscopy, and enhanced cytotoxicity of entrapped cytosine-beta-D-arabinofuranoside, as shown by an 11-fold reduction in the IC(50) in KB cells, compared to FR-targeted non-pH-sensitive liposomes. Furthermore, FR-targeted pH-sensitive liposomes composed of DDAB/CHEMS/f-PEG-PE, combined with polylysine-condensed plasmid DNA, were shown to mediate FR-specific delivery of a luciferase reporter gene into KB cells in the presence of 10% serum. These findings suggest that cationic lipid-containing pH-sensitive liposomes, combined with FR targeting, are effective vehicles for intracellular drug and gene delivery." @default.
• W2079730270 created "2016-06-24" @default.
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• W2079730270 date "2002-04-01" @default.
• W2079730270 modified "2023-10-05" @default.
• W2079730270 title "Efficient intracellular drug and gene delivery using folate receptor-targeted pH-sensitive liposomes composed of cationic/anionic lipid combinations" @default.
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• W2079730270 doi "https://doi.org/10.1016/s0168-3659(02)00017-2" @default.
• W2079730270 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11943407" @default.
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