title: Phagocytosis of PLGA microparticles in rat peritoneal exudate cells: a time-dependent study.
abstract: With the purpose of enhancing the efficacy of microparticle-encapsulated therapeutic agents, in this study we evaluated the phagocytic ability of rat peritoneal exudate cells and the preferential location of poly(d,l-lactide-co-glycolic acid) (PLGA) microparticles inside these cells. The microparticles used were produced by a solvent evaporation method and were characterized by dynamic light scattering (DLS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). Size distribution analysis using DLS and SEM showed that the particles were spherical, with diameters falling between 0.5 and 1.5 mum. Results from cell adhesion by SEM assay, indicated that the PLGA microparticles are not toxic to cells and do not cause any distinct damage to them as confirmed by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assay. Among the large variety of cell populations found in the peritoneal exudates (neutrophils, eosinophils, monocytes, and macrophages), TEM showed that only the latter phagocytosed PLGA microparticles, in a time-dependent manner. The results obtained indicate that the microparticles studied show merits as possible carriers of drugs for intracellular delivery.
authors.affiliation: Laboratório de Fotoquímica, Instituto de Química, Universidade Federal de Uberlândia, CEP 38400-089 Uberlândia, MG, Brazil. anderson@iqufu.ufu.br
authors.forename: Anderson
authors.initials: A
authors.lastname: de Jesus Gomes
authors.forename: Claure Nain
authors.initials: CN
authors.lastname: Lunardi
authors.forename: Flávio Henrique
authors.initials: FH
authors.lastname: Caetano
authors.forename: Laurelúcia Orive
authors.initials: LO
authors.lastname: Lunardi
authors.forename: Antonio Eduardo
authors.initials: AE
authors.lastname: da Hora Machado
mesh_terms: D000818:Animals; D016503:Drug Delivery Systems; D066298:In Vitro Techniques; D007700:Kinetics; D019344:Lactic Acid; D008027:Light; D017737:Macrophages, Peritoneal / Q000502:physiology* / Q000648:ultrastructure*; D008297:Male; D008564:Membrane Potentials; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D010316:Particle Size; D010587:Phagocytosis; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers; D051381:Rats; D012542:Scattering, Radiation
chemical_list: D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid