title: Paclitaxel-loaded Pluronic nanoparticles formed by a temperature-induced phase transition for cancer therapy.
abstract: We prepared nanoparticles by a temperature-induced phase transition in a mixture of Pluronic F-68 and liquid PEG (polyethylene glycol, molecular weight: 400) containing paclitaxel (PTX) with a fast, simple, continuous and solvent-free process. The liquid PEG is used as solubilizer of PTX and the polymer for the encapsulation of PTX is composed of Pluronic F-68. At the phase transition temperature, the polymer mixture was changed to the liquid phase, and stirring the liquid 0 °C to form Pluronic nanoparticles. The morphology and size distribution of the prepared Pluronic nanoparticles were observed using FE-SEM and TEM, and a particle size analyzer and cryo-TEM were used to observe the shape of paclitaxel-loaded Pluronic nanoparticles in an aqueous state. To apply Pluronic nanoparticles as a delivery system for cancer therapy, the release pattern of PTX, a model anti-cancer drug, was observed and the tumor growth was monitored by injecting the PTX-loaded Pluronic nanoparticles into the tail veins of tumor-bearing mice. We also evaluated the time-dependent excretion profile, in vivo biodistribution, circulation time, and tumor targeting ability of PTX-loaded Pluronic nanoparticles using non-invasive live animal imaging technology. In the early stage within 7h of release, the loaded PTX was rapidly released and the sustained release was observed for up to 48 h. In vivo studies, PTX-loaded Pluronic nanoparticles were observed with higher anti-tumor efficacy compared with PTX formulated in Cremophor EL.
authors.affiliation: Department of Advanced Materials, Hannam University, 461-6 Jeonmin Dong, Yusung Gu, Daejeon 305-811, Republic of Korea.
authors.forename: Keun Sang
authors.initials: KS
authors.lastname: Oh
authors.forename: Ji Yung
authors.initials: JY
authors.lastname: Song
authors.forename: Sun Hang
authors.initials: SH
authors.lastname: Cho
authors.forename: Bum Suk
authors.initials: BS
authors.lastname: Lee
authors.forename: Sang Yoon
authors.initials: SY
authors.lastname: Kim
authors.forename: Kwangmeyung
authors.initials: K
authors.lastname: Kim
authors.forename: Hyesung
authors.initials: H
authors.lastname: Jeon
authors.forename: Ick Chan
authors.initials: IC
authors.lastname: Kwon
authors.forename: Soon Hong
authors.initials: SH
authors.lastname: Yuk
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage* / Q000494:pharmacology / Q000627:therapeutic use*; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D004337:Drug Carriers / Q000737:chemistry; D006801:Humans; D008297:Male; D051379:Mice; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000191:economics / Q000379:methods*; D009369:Neoplasms / Q000188:drug therapy; D017239:Paclitaxel / Q000008:administration & dosage* / Q000494:pharmacology / Q000627:therapeutic use*; D044367:Phase Transition; D020442:Poloxamer / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D004337:Drug Carriers; D020442:Poloxamer; D011092:Polyethylene Glycols; D017239:Paclitaxel