title: PEGylated chitosan-based polymer micelle as an intracellular delivery carrier for anti-tumor targeting therapy.
abstract: Stearic acid-grafted chitosan oligosaccharide (CSO-SA) micelles presented a potential candidate for intracellular drug delivery carrier due to its special spatial structure. In this article, CSO-SA was further modified by polyethylene glycol (PEG). The physicochemical properties of PEGylated CSO-SA (PEG-CSO-SA) micelles were characterized. After PEGylation, the critical micelle concentration (CMC) of PEG-CSO-SA had no significant change; the micelle size increased; and the zeta potential decreased. The cellular uptake of CSO-SA micelles before and after PEGylation in macrophage RAW264.7, immortalized rat liver cells BRL-3A and human liver tumor cells HepG2 was studied. About 58.4+/-0.63% of CSO-SA micelles were uptaked by RAW264.7 in 24h, however, only 17.7+/-0.94% of PEG-CSO-SA micelles were internalized into RAW264.7 after the CSO-SA was modified with PEG in five molar times. Meanwhile, there were no changes in the uptake after PEGylation of CSO-SA in BRL-3A and HepG2. Using mitomycin C as a model drug, the in vitro anti-tumor activities of the drug loaded in the micelles were investigated. The 50% cellular growth inhibition (IC(50)) of the drug decreased from 1.97+/-0.2 to 0.13+/-0.02mug/mL after mitomycin C was loaded into CSO-SA micelles, and the IC(50) value of the drug had no obvious change when the CSO-SA was modified by PEG.
authors.affiliation: College of Pharmaceutical Science, Zhejiang University, Hangzhou, PR China. hufq@zju.edu.cn
authors.forename: Fu-Qiang
authors.initials: FQ
authors.lastname: Hu
authors.forename: Pan
authors.initials: P
authors.lastname: Meng
authors.forename: You-Qin
authors.initials: YQ
authors.lastname: Dai
authors.forename: Yong-Zhong
authors.initials: YZ
authors.lastname: Du
authors.forename: Jian
authors.initials: J
authors.lastname: You
authors.forename: Xiao-Hong
authors.initials: XH
authors.lastname: Wei
authors.forename: Hong
authors.initials: H
authors.lastname: Yuan
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D002626:Chemistry, Pharmaceutical; D048271:Chitosan / Q000031:analogs & derivatives / Q000737:chemistry / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D004337:Drug Carriers; D004339:Drug Compounding; D006801:Humans; D020128:Inhibitory Concentration 50; D008099:Liver / Q000378:metabolism; D008264:Macrophages / Q000378:metabolism; D051379:Mice; D008823:Micelles; D016685:Mitomycin / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry / Q000378:metabolism*; D051381:Rats; D012995:Solubility; D013229:Stearic Acids / Q000737:chemistry / Q000378:metabolism*; D013997:Time Factors
chemical_list: D000903:Antibiotics, Antineoplastic; D004337:Drug Carriers; D008823:Micelles; D013229:Stearic Acids; D011092:Polyethylene Glycols; D016685:Mitomycin; D048271:Chitosan