title: Construction of a novel cationic polymeric liposomes formed from PEGlated octadecyl-quaternized lysine modified chitosan/cholesterol for enhancing storage stability and cellular uptake efficiency.
abstract: The design and construction of delivery vectors with high stability and effective cellular uptake efficiency is very important. In this study, a novel polymeric liposomes (PLs) formed from PEGlated octadecyl-quaternized lysine modified chitosan (OQLCS) and cholesterol with higher size stability and cellular uptake efficiency has been synthesized successfully. Compared to conventional liposomes (CLs; phosphatidyl choline/cholesterol), the calcein-loaded PLs exhibited a multi-lamellar structure with homogenous size diameter (200 nm) and high calcein encapsulation efficiency (about 92%). PLs could be stored at different temperature (25, 4, and -20 degrees C) and different medium (deionized water, phosphate-buffered saline, and human plasma solution) for up to 4 weeks without significant size change. The spectrophotometer fluorometry analysis and the flow cytometry analysis indicated that in comparison with CL, PLs with positive zeta potential facilitates the uptake of calcein by MCF-7 tumor cells. The data suggests that PLs may provide a new method to overcome the stability and enhance the uptake efficiency of CLs.
authors.affiliation: Institute of Nanobiotechnology, School of Materials Science and Engineering, Tianjin University and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin 300072, PR China.
authors.forename: Hanjie
authors.initials: H
authors.lastname: Wang
authors.forename: Peiqi
authors.initials: P
authors.lastname: Zhao
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Liang
authors.forename: Tao
authors.initials: T
authors.lastname: Song
authors.forename: Xiaoqun
authors.initials: X
authors.lastname: Gong
authors.forename: Ruifang
authors.initials: R
authors.lastname: Niu
authors.forename: Jin
authors.initials: J
authors.lastname: Chang
mesh_terms: D045744:Cell Line, Tumor; D048271:Chitosan / Q000031:analogs & derivatives*; D002784:Cholesterol / Q000031:analogs & derivatives*; D004337:Drug Carriers / Q000138:chemical synthesis* / Q000493:pharmacokinetics*; D004355:Drug Stability; D005452:Fluoresceins / Q000493:pharmacokinetics; D006801:Humans; D008081:Liposomes / Q000138:chemical synthesis* / Q000493:pharmacokinetics*; D008239:Lysine / Q000031:analogs & derivatives*
chemical_list: D004337:Drug Carriers; D005452:Fluoresceins; D008081:Liposomes; D048271:Chitosan; D002784:Cholesterol; D008239:Lysine; C007740:fluorexon