title: A facile method to prepare heparin-functionalized nanoparticles for controlled release of growth factors.
abstract: A new, facile method to prepare the heparin-functionalized PLGA nanoparticle (HEP-PLGA NP) for the controlled release of growth factors is developed. This system is composed of PLGA as a hydrophobic core, Pluronic F-127 as a hydrophilic surface layer, and heparin as the functional moiety. HEP-PLGA NPs were prepared by a solvent-diffusion method without chemical modification of the components. The entrapment of heparin molecules was confirmed by a negatively increased zeta potential value and the specific binding affinity to antithrombin III. The average diameter and the surface charge of the nanoparticles were ranged from 139+/-2 to 188+/-4 nm and from -26.0+/-1.1 to -44.1+/-1.3 mV by increasing the amount of heparin during the nanoparticle preparation. Accordingly, the amount of heparin on the nanoparticle increased from 0% to 4.7%. As a model in vitro release experiment, lysozyme was loaded into HEP-PLGA NPs, and a sustained release profile over 2 weeks was obtained with maintaining its bioactivity. The release of rhVEGF, one of the heparin-binding growth factors, showed a more sustained and prolonged profile than that of lysozyme over one month.
authors.affiliation: Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea.
authors.forename: Yong-Il
authors.initials: YI
authors.lastname: Chung
authors.forename: Giyoong
authors.initials: G
authors.lastname: Tae
authors.forename: Soon
authors.initials: S
authors.lastname: Hong Yuk
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry* / Q000378:metabolism; D004337:Drug Carriers / Q000737:chemistry* / Q000378:metabolism; D006133:Growth Substances / Q000378:metabolism*; D006493:Heparin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D006801:Humans; D019344:Lactic Acid / Q000737:chemistry* / Q000378:metabolism; D008422:Materials Testing; D009113:Muramidase / Q000378:metabolism; D010316:Particle Size; D011100:Polyglycolic Acid / Q000737:chemistry* / Q000378:metabolism; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry* / Q000378:metabolism; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism
chemical_list: D001672:Biocompatible Materials; D004337:Drug Carriers; D006133:Growth Substances; D011108:Polymers; D042461:Vascular Endothelial Growth Factor A; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D006493:Heparin; D009113:Muramidase