title: Hydrophobically modified glycol chitosan nanoparticles as carriers for paclitaxel.
abstract: Self-assembled nanoparticles based on hydrophobically modified glycol chitosan (HGC) were prepared as a carrier for paclitaxel. HGC conjugates were prepared by chemically linking 5beta-cholanic acid to glycol chitosan chains using 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide chemistry. In phosphate-buffered saline (PBS; pH 7.4), the synthesized HGC conjugates formed nano-sized particles with a diameter of 200 nm and exhibited high thermodynamic stability as reflected by their low critical aggregation concentration (0.03 mg/ml). Paclitaxel was efficiently loaded into HGC nanoparticles up to 10 wt.% using a dialysis method. The paclitaxel-loaded HGC (PTX-HGC) nanoparticles were 400 nm in diameter and were stable in PBS for 10 days. These PTX-HGC nanoparticles also showed sustained release of the incorporated of paclitaxel (80% of the loaded dose was released in 8 days at 37 degrees C in PBS). Owing to sustained release, the PTX-HGC nanoparticles were less cytotoxic to B16F10 melanoma cells than free paclitaxel formulated in Cremophor EL. Injection of PTX-HGC nanoparticles into the tail vein of tumor-bearing mice prevented increases in tumor volume for 8 days. Finally, PTX was less toxic to the tumor-bearing mice when formulated in HGC nanoparticles than when formulated with Cremophor EL.
authors.affiliation: Biomedical Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, South Korea.
authors.forename: Jong-Ho
authors.initials: JH
authors.lastname: Kim
authors.forename: Yoo-Shin
authors.initials: YS
authors.lastname: Kim
authors.forename: Sungwon
authors.initials: S
authors.lastname: Kim
authors.forename: Jae Hyung
authors.initials: JH
authors.lastname: Park
authors.forename: Kwangmeyung
authors.initials: K
authors.lastname: Kim
authors.forename: Kuiwon
authors.initials: K
authors.lastname: Choi
authors.forename: Hesson
authors.initials: H
authors.lastname: Chung
authors.forename: Seo Young
authors.initials: SY
authors.lastname: Jeong
authors.forename: Rang-Woon
authors.initials: RW
authors.lastname: Park
authors.forename: In-San
authors.initials: IS
authors.lastname: Kim
authors.forename: Ick Chan
authors.initials: IC
authors.lastname: Kwon
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology; D001835:Body Weight / Q000187:drug effects; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D048271:Chitosan / Q000737:chemistry*; D004337:Drug Carriers / Q000737:chemistry; D005990:Glycerol / Q000031:analogs & derivatives / Q000737:chemistry; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D007275:Injections, Intravenous; D008297:Male; D008546:Melanoma, Experimental / Q000188:drug therapy / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D049329:Nanostructures / Q000737:chemistry*; D017239:Paclitaxel / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology*; D013678:Technology, Pharmaceutical / Q000379:methods; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D004337:Drug Carriers; C118638:glycol-chitosan; C000515:cremophor EL; D048271:Chitosan; D017239:Paclitaxel; D005990:Glycerol