title: Propaedeutic study for the delivery of nucleic acid-based molecules from PLGA microparticles and stearic acid nanoparticles.
abstract: We studied the mechanism governing the delivery of nucleic acid-based drugs (NABD) from microparticles and nanoparticles in zero shear conditions, a situation occurring in applications such as in situ delivery to organ parenchyma. The delivery of a NABD molecule from poly(DL-lactide-co-glycolide) (PLGA) microparticles and stearic acid (SA) nanoparticles was studied using an experimental apparatus comprising a donor chamber separated from the receiver chamber by a synthetic membrane. A possible toxic effect on cell biology, as evaluated by studying cell proliferation, was also conducted forjust PLGA microparticles. A mathematical model based on the hypothesis that NABD release from particles is due to particle erosion was used to interpret experimental release data. Despite zero shear conditions imposed in the donor chamber, particle erosion was the leading mechanism for NABD release from both PLGA microparticles and SA nanoparticles. PLGA microparticle erosion speed is one order of magnitude higher than that of competing SA nanoparticles. Finally, no deleterious effects of PLGA microparticles on cell proliferation were detected. Thus, the data here reported can help optimize the delivery systems aimed at release of NABD from micro- and nanoparticles.
authors.affiliation: Department of Internal Medicine, University Hospital of Trieste, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Grassi
authors.forename: N
authors.initials: N
authors.lastname: Coceani
authors.forename: R
authors.initials: R
authors.lastname: Farra
authors.forename: B
authors.initials: B
authors.lastname: Dapas
authors.forename: G
authors.initials: G
authors.lastname: Racchi
authors.forename: N
authors.initials: N
authors.lastname: Fiotti
authors.forename: A
authors.initials: A
authors.lastname: Pascotto
authors.forename: B
authors.initials: B
authors.lastname: Rehimers
authors.forename: G
authors.initials: G
authors.lastname: Guarnieri
authors.forename: M
authors.initials: M
authors.lastname: Grassi
mesh_terms: D002478:Cells, Cultured; D003198:Computer Simulation; D004337:Drug Carriers / Q000737:chemistry / Q000494:pharmacology; D006801:Humans; D019344:Lactic Acid / Q000737:chemistry* / Q000494:pharmacology*; D008422:Materials Testing; D008863:Microspheres; D008956:Models, Chemical; D032389:Myocytes, Smooth Muscle / Q000166:cytology / Q000187:drug effects*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D009696:Nucleic Acids / Q000008:administration & dosage* / Q000737:chemistry; D011100:Polyglycolic Acid / Q000737:chemistry* / Q000494:pharmacology*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry* / Q000494:pharmacology*; D013229:Stearic Acids / Q000737:chemistry* / Q000494:pharmacology*
chemical_list: D004337:Drug Carriers; D009696:Nucleic Acids; D011108:Polymers; D013229:Stearic Acids; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; C031183:stearic acid