title: Photobiological and ultrastructural studies of nanoparticles of poly(lactic-co-glycolic acid)-containing bacteriochlorophyll-a as a photosensitizer useful for PDT treatment.
abstract: The interaction of polymeric nanoparticles formulated from the biodegradable polymer poly(DL-lactide-co-glycolide) loaded with bacteriochlorophyll-a was studied in homogeneous solution and in vitro in the presence of a macrophage cell line (P388-D1-ATCC). Photodynamic therapy (PDT) activity after different laser doses also was investigated. Scanning electron microscopy analysis of cell phagocyte nanoparticles showed that after 30 min of incubation most of the nanoparticles are in a clear adhesion process to the cell surface. The majority of nanoparticles became phagocytic after 2 hr of incubation time. After laser irradiation of the dye-containing system a total photodamage by nanoparticle phagocyte cells was observed and the cell survival was quantified by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide test. Our results indicate that polymeric nanoparticles work as an efficient drug delivery system for PDT drugs. This approach can be widely used for many other hydrophobic photosensitizers with higher aggregation tendency in neoplastic cell treatment.
authors: Instituto de Química da Universidade Federal de Uberlândia, Brazil.
authors: Anderson J
authors: AJ
authors: Gomes
authors: Laurelúcia O
authors: LO
authors: Lunardi
authors: Juliana M
authors: JM
authors: Marchetti
authors: Claure N
authors: CN
authors: Lunardi
authors: Antonio C
authors: AC
authors: Tedesco
mesh_terms: D000818:Animals; D025541:Bacteriochlorophyll A / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D002460:Cell Line; D002462:Cell Membrane / Q000187:drug effects / Q000528:radiation effects / Q000648:ultrastructure; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects; D003627:Data Interpretation, Statistical; D019344:Lactic Acid / Q000737:chemistry*; D008027:Light; D008264:Macrophages / Q000187:drug effects / Q000528:radiation effects / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning / Q000379:methods; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D010587:Phagocytosis / Q000187:drug effects / Q000528:radiation effects; D010778:Photochemotherapy / Q000379:methods; D017319:Photosensitizing Agents / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry*; D013678:Technology, Pharmaceutical / Q000379:methods; D013997:Time Factors
chemical_list: D025541:Bacteriochlorophyll A; D017319:Photosensitizing Agents; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid