title: Characterization of pegylated copolymeric micelles and in vivo pharmacokinetics and biodistribution studies.
abstract: The aim of this study was to evaluate the influence of pegylated copolymeric micelle carrier on the biodistribution of drug in rats. The copolymers were synthesized via a modified ring-opening copolymerization of lactone monomers (epsilon-caprolactone, delta-valerolactone, L-lactide) and poly(ethylene glycol) (PEG(10,000) and PEG(4000)). The molecular weights and the polydispersities of synthesized copolymers were in the range of 15,000-31,000 g/mol and 1.7-2.7, respectively. All of the pegylated amphiphilic copolymers were micelles formed with low CMC values in the range of 10(-7)-10(-8)M. The drug-loaded micelles were prepared via a dialysis method. The average particle size of micelles was around 150-200 nm. The cytotoxicity in terms of cell viability after treated with PCL-PEG, PVL-PEG, and PLA-PEG micelles was insignificant. PCL-PEG and PVL-PEG micelles without branch side chain in structures had higher drug loading than PLA-PEG micelles. In vitro release profiles indicated the release of indomethacin from these micelles exhibited a sustained release behavior. The similar phenomenon was also observed in vivo in rats. The pegylated copolymeric micelles not only decreased drug uptake by the liver and kidney, but also prolonged drug retention in the blood.
authors.affiliation: School of Pharmacy, College of Medicine, National Taiwan University, Taipei 100, Taiwan. wjlin@ha.mc.ntu.edu.tw
authors.forename: Wen-Jen
authors.initials: WJ
authors.lastname: Lin
authors.forename: Yi-Chen
authors.initials: YC
authors.lastname: Chen
authors.forename: Chi-Chang
authors.initials: CC
authors.lastname: Lin
authors.forename: Chau-Fong
authors.initials: CF
authors.lastname: Chen
authors.forename: Ji-Wang
authors.initials: JW
authors.lastname: Chen
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000737:chemistry / Q000493:pharmacokinetics; D001672:Biocompatible Materials; D002208:Caproates / Q000737:chemistry / Q000493:pharmacokinetics; D002470:Cell Survival; D002478:Cells, Cultured; D003692:Delayed-Action Preparations; D004337:Drug Carriers / Q000737:chemistry / Q000493:pharmacokinetics; D016503:Drug Delivery Systems; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism; D006801:Humans; D007213:Indomethacin / Q000737:chemistry / Q000493:pharmacokinetics; D007783:Lactones / Q000737:chemistry / Q000493:pharmacokinetics; D008297:Male; D008422:Materials Testing; D008823:Micelles; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry / Q000493:pharmacokinetics; D051381:Rats; D017208:Rats, Wistar; D014018:Tissue Distribution
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D001672:Biocompatible Materials; D002208:Caproates; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D007783:Lactones; D008823:Micelles; D011092:Polyethylene Glycols; C121056:caprolactone; D007213:Indomethacin