title: Particle size-dependent triggering of accelerated blood clearance phenomenon.
abstract: A repeat-injection of polyethylene glycol-modified liposomes (PEGylated liposomes) causes a rapid clearance of them from the blood circulation in certain cases that is referred to as the accelerated blood clearance (ABC) phenomenon. In the present study, we examined whether polymeric micelles trigger ABC phenomenon or not. As a preconditioning treatment, polymeric micelles (9.7, 31.5, or 50.2 nm in diameter) or PEGylated liposomes (119, 261 or 795 nm) were preadministered into BALB/c mice. Three days after the preadministration [(3)H]-labeled PEGylated liposomes (127 nm) as a test dose were administered into the mice to determine the biodistribution of PEGylated liposomes. At 24h after the test dose was given, accelerated clearance of PEGylated liposomes from the bloodstream and significant accumulation in the liver was observed in the mice preadministered with 50.2-795 nm nanoassemblies (PEGylated liposomes or polymeric micelles). In contrast, such phenomenon was not observed with 9.7-31.5 nm polymeric micelles. The enhanced blood clearance and hepatic uptake of the test dose (ABC phenomenon) were related to the size of triggering nanoassemblies. Our study provides important information for developing both drug and gene delivery systems by means of nanocarriers.
authors.affiliation: Department of Medical Biochemistry and Global COE Program, Graduate School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Koide
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Asai
authors.forename: Kentaro
authors.initials: K
authors.lastname: Hatanaka
authors.forename: Takeo
authors.initials: T
authors.lastname: Urakami
authors.forename: Takayuki
authors.initials: T
authors.lastname: Ishii
authors.forename: Eriya
authors.initials: E
authors.lastname: Kenjo
authors.forename: Masamichi
authors.initials: M
authors.lastname: Nishihara
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yokoyama
authors.forename: Tatsuhiro
authors.initials: T
authors.lastname: Ishida
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kiwada
authors.forename: Naoto
authors.initials: N
authors.lastname: Oku
mesh_terms: D000818:Animals; D004305:Dose-Response Relationship, Drug; D008081:Liposomes / Q000008:administration & dosage / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics; D008297:Male; D008657:Metabolic Clearance Rate; D051379:Mice; D008807:Mice, Inbred BALB C; D010316:Particle Size; D010743:Phospholipids / Q000737:chemistry / Q000493:pharmacokinetics; D011092:Polyethylene Glycols / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics*; D014018:Tissue Distribution
chemical_list: D008081:Liposomes; D010743:Phospholipids; D011092:Polyethylene Glycols