title: Positively charged calcium phosphate/polymer nanoparticles for photodynamic therapy.
abstract: The charge of nanoparticles influences their ability to pass through the cellular membrane, and a positive charge should be beneficial. The negative charge of calcium phosphate nanoparticles with an inner shell of carboxymethyl cellulose (CMC) was reversed by adding an outer shell of poly(ethyleneimine) (PEI) into which the photoactive dye 5,10,15,20-tetrakis(3-hydroxyphenyl)-porphyrin (mTHPP) was loaded. The aqueous dispersion of the nanoparticles was used for photodynamic therapy with HT29 cells (human colon adenocarcinoma cells), HIG-82 cells (rabbit synoviocytes), and J774A.1 cells (murine macrophages). A high photodynamic activity (killing) together with a very low dark toxicity was observed for HIG-82 and for J774.1 cells at 2 microM dye concentration. The killing efficiency was equivalent to the pure photoactive dye that, however, needs to be administered in alcoholic solution.
authors.affiliation: Inorganic Chemistry and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Universitaetsstr. 5-7, 45117 Essen, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Klesing
authors.forename: A
authors.initials: A
authors.lastname: Wiehe
authors.forename: B
authors.initials: B
authors.lastname: Gitter
authors.forename: S
authors.initials: S
authors.lastname: Gräfe
authors.forename: M
authors.initials: M
authors.lastname: Epple
mesh_terms: D000818:Animals; D002130:Calcium Phosphates / Q000737:chemistry*; D002412:Cations; D045744:Cell Line, Tumor; D004396:Coloring Agents / Q000737:chemistry; D006801:Humans; D008264:Macrophages / Q000378:metabolism; D051379:Mice; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D010778:Photochemotherapy / Q000379:methods*; D011094:Polyethyleneimine / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011427:Propiophenones / Q000737:chemistry; D011817:Rabbits
chemical_list: D002130:Calcium Phosphates; D002412:Cations; D004396:Coloring Agents; D011108:Polymers; D011427:Propiophenones; C014870:flopropione; D011094:Polyethyleneimine; C020243:calcium phosphate