title: Particle characteristics and biodistribution of camptothecin-loaded PLA/(PEG-PPG-PEG) nanoparticles.
abstract: Poly(DL-lactic acid) (PLA)/poly(ethylene glycol)-block-poly (propylene glycol)-block-poly(ethylene glycol) copolymer (PEG-PPG-PEG) nanoparticles loaded with camptothecin (CPT), called CPT-NP, were prepared and examined for particle size change and drug release in phosphate-buffered saline, pH 7.4, (PBS), and drug biodistribution profiles in mice bearing sarcoma 180 solid tumor. CPT-NP kept an almost constant mean size and exhibited an initial rapid release of approximately 20%, following by very slow release. As compared with CPT solution, CPT-NP showed higher tissue accumulation and better tumor localization, which were considered essentially associated with the better efficacy of CPT-NP reported in the previous study.
authors.affiliation: Department of Drug Delivery Research, Hoshi University, Tokyo, Japan.
authors.forename: Ryotaro
authors.initials: R
authors.lastname: Kunii
authors.forename: Hiraku
authors.initials: H
authors.lastname: Onishi
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Ueki
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Koyama
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Machida
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000493:pharmacokinetics*; D002166:Camptothecin / Q000737:chemistry / Q000493:pharmacokinetics*; D002626:Chemistry, Pharmaceutical; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D004339:Drug Compounding; D006863:Hydrogen-Ion Concentration; D019344:Lactic Acid / Q000737:chemistry*; D008297:Male; D051379:Mice; D053758:Nanoparticles; D010316:Particle Size; D011091:Polyesters; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011409:Propylene Glycols / Q000737:chemistry*; D012510:Sarcoma 180 / Q000378:metabolism*; D012995:Solubility; D014018:Tissue Distribution
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D011091:Polyesters; D011108:Polymers; D011409:Propylene Glycols; C528875:poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) copolymer; D019344:Lactic Acid; D011092:Polyethylene Glycols; C033616:poly(lactide); D002166:Camptothecin