Abstract:
PURPOSE:To develop a liposomal system with high drug loading (DL) for intravenous (i.v.) delivery of a poorly water-soluble basic drug, asulacrine (ASL). METHODS:A thin-film hydration and extrusion method was used to fabricate the PEGylated liposomal membranes followed by a freeze and thaw process. A novel active drug loading method was developed using ammonium sulphate gradient as an influx driving force of ASL solubilized with sulfobutyl ether-β-cyclodextrin (SBE-β-CD). DL was maximized by optimizing liposomal preparation and loading conditions. Pharmacokinetics was evaluated following i.v. infusion in rabbits. RESULTS:Freeze-thaw resulted in unilamellar liposome formation (180 nm) free of micelles. Higher DL was obtained when dialysis was used to remove the untrapped ammonium sulphate compared to ultracentrifuge. The pH and SBE-β-CD level in the loading solution played key roles in enhancing DL. High DL ASL-liposomes (8.9%w/w, drug-to-lipid mole ratio 26%) were obtained with some drug "bundles" in the liposomal cores and were stable in a 5% glucose solution for >80 days with minimal leakage (<2%). Surprisingly, following administration of ASL-liposomes prepared with or without SBE-β-CD, the half-lives were similar to the drug solution despite an increased area under the curve, indicating drug leakage from the carriers. CONCLUSIONS:High liposomal DL was achieved with multiple strategies for a poorly-water soluble weak base. However, the liposomal permeability needed to be tailored to improve drug retention.
journal_name
Pharm Resjournal_title
Pharmaceutical researchauthors
Zhang W,Wang G,Falconer JR,Baguley BC,Shaw JP,Liu J,Xu H,See E,Sun J,Aa J,Wu Zdoi
10.1007/s11095-014-1551-8subject
Has Abstractpub_date
2015-04-01 00:00:00pages
1451-61issue
4eissn
0724-8741issn
1573-904Xjournal_volume
32pub_type
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journal_title:Pharmaceutical research
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更新日期:1991-12-01 00:00:00
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更新日期:2003-11-01 00:00:00
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journal_title:Pharmaceutical research
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更新日期:2017-05-01 00:00:00
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更新日期:2020-01-28 00:00:00