title: Cationic poly(lactide-co-glycolide) nanoparticles as efficient in vivo gene transfection agents.
abstract: Poly(lactide-co-glycolide) (PLGA), a biocompatible and biodegradable polyester co-polymer of PLA and PGA, has been recognized for its ability to deliver genes. However, gene delivery by PLGA nanoparticles is limited by their negative charge and their poor transport through mucosal barriers. In this study, PLGA nanoparticles were surface modified with cationic chitosan in an effort to improve their gene delivery capability. PLGA nanoparticles were synthesized by emulsion-diffusion-evaporation technique using PVA-chitosan (PLGA1) or PVA-chitosan-PEG (PLGA2) blend as stabilizers. This method is reproducible and produces nanoparticles with hydrodynamic diameter <200 nm. The nanoparticles were characterized by zetasizer, photon correlation spectroscopy and atomic force microscopy. A549 epithelial cells were transfected in vitro with PLGA particles complexed with a reporter plasmid encoding green fluorescent protein. PLGA particles transferred EGFP gene, but were less efficient than the lipofectamine control. The nanoparticles were also tested for their ability to transport across the nasal mucosa in vivo in mice. The results show that both PLGA1 and PLGA2 facilitate gene delivery and expression in vivo with increased efficiency and without causing inflammation, as measured by IL-6. Together, these results indicate that chitosan-modified PLGA nanoparticles have greater potential as gene carriers.
authors.affiliation: Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, SAS Nagar, Mohali 160 062, India.
authors.forename: M N V Ravi
authors.initials: MN
authors.lastname: Kumar
authors.forename: S S
authors.initials: SS
authors.lastname: Mohapatra
authors.forename: X
authors.initials: X
authors.lastname: Kong
authors.forename: P K
authors.initials: PK
authors.lastname: Jena
authors.forename: U
authors.initials: U
authors.lastname: Bakowsky
authors.forename: C M
authors.initials: CM
authors.lastname: Lehr
mesh_terms: D000818:Animals; D002460:Cell Line; D002478:Cells, Cultured; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D004337:Drug Carriers / Q000737:chemistry*; D005260:Female; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D006801:Humans; D008422:Materials Testing; D051379:Mice; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D010957:Plasmids / Q000008:administration & dosage* / Q000737:chemistry; D011098:Polyglactin 910 / Q000737:chemistry*; D011994:Recombinant Proteins / Q000378:metabolism; D020545:Respiratory Mucosa / Q000378:metabolism*; D013499:Surface Properties; D014162:Transfection / Q000379:methods*
chemical_list: D020099:Coated Materials, Biocompatible; D004337:Drug Carriers; D011994:Recombinant Proteins; D049452:Green Fluorescent Proteins; D011098:Polyglactin 910