title: Size and surface charge effect of 5-aminolevulinic acid-containing liposomes on photodynamic therapy for cultivated cancer cells.
abstract: 5-Aminolevulinic acid (ALA)-containing liposomes having various average diameters and/or positive surface charges were prepared, and their photodynamic therapy (PDT) efficacy for murine thymic lymphoma cells, EL-4 cells, cultivated in vitro was investigated. The PDT efficacy for EL-4 cells and the accumulation of ALA-induced protoporphyrin IX (PpIX) in the cells increased with a decrease in the average diameter of liposomes. In particular, the ALA-containing liposomes smaller than 63.5 nm in diameter promoted the PDT efficacy in comparison with that of ALA alone. We also found no significant changes in PDT efficacy and PpIX accumulation with increasing positive surface charges of liposomes.
authors.affiliation: Faculty of Engineering, Toin University of Yokohama, Yokohama, Japan.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Kosobe
authors.forename: Eiji
authors.initials: E
authors.lastname: Moriyama
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Tokuoka
authors.forename: Norimichi
authors.initials: N
authors.lastname: Kawashima
mesh_terms: D000622:Aminolevulinic Acid / Q000008:administration & dosage*; D000818:Animals; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D008081:Liposomes; D051379:Mice; D010316:Particle Size; D010778:Photochemotherapy; D017319:Photosensitizing Agents / Q000008:administration & dosage* / Q000378:metabolism; D011524:Protoporphyrins / Q000378:metabolism; D013499:Surface Properties
chemical_list: D008081:Liposomes; D017319:Photosensitizing Agents; D011524:Protoporphyrins; D000622:Aminolevulinic Acid; C028025:protoporphyrin IX