title: Transfection with different colloidal systems: comparison of solid lipid nanoparticles and liposomes.
abstract: Cationic solid lipid nanoparticles (SLN) for gene transfer are formulated using the same cationic lipids as for liposomal transfection agents. To investigate the differences and similarities in structure and performance between SLN and liposomes, a SLN preparation (S1), its counterpart formulation without matrix lipid (L1), a commercially available liposomal preparation (DLTR)--all based on the cationic lipid DOTAP--and a liposomal formulation that additionally contained the helper lipid dioleoylphosphatidylethanolamine (DOPE) (Escort) were compared. Photon correlation spectroscopy (PCS) showed that the SLN were smaller in diameter than the corresponding liposomes (88 vs. 148 nm) and atomic force microscopy (AFM) supported the expected structural differences. Desoxy ribonuclein acid (DNA) binding differed only marginally. Surprisingly, reporter gene expression was comparable between all DOTAP based formulations (S1, L1, DLTR), surpassed only by the DOPE containing liposomes (Escort). In conclusion, cationic lipid composition seems to be more dominant for in vitro transfection performance than the kind of colloidal structure it is arranged in. Hence, cationic SLN extend the range of highly potent non-viral transfection agents by one with favourable and distinct technological properties. Further SLN optimisation should be facilitated by the accumulated knowledge about cationic lipids in liposomal formulations.
authors.affiliation: Department of Pharmaceutical Technology, Biopharmacy and Biotechnology, Free University of Berlin, 12169 Berlin, Germany.
authors.forename: Kerstin
authors.initials: K
authors.lastname: Tabatt
authors.forename: Carsten
authors.initials: C
authors.lastname: Kneuer
authors.forename: Mohammad
authors.initials: M
authors.lastname: Sameti
authors.forename: Carsten
authors.initials: C
authors.lastname: Olbrich
authors.forename: Rainer H
authors.initials: RH
authors.lastname: Müller
authors.forename: Claus-Michael
authors.initials: CM
authors.lastname: Lehr
authors.forename: Udo
authors.initials: U
authors.lastname: Bakowsky
mesh_terms: D000818:Animals; D019556:COS Cells; D002522:Chlorocebus aethiops; D003102:Colloids / Q000737:chemistry*; D004247:DNA / Q000008:administration & dosage; D004587:Electrophoresis, Agar Gel; D005229:Fatty Acids, Monounsaturated / Q000737:chemistry; D008055:Lipids / Q000737:chemistry*; D008081:Liposomes / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D049329:Nanostructures / Q000737:chemistry*; D010957:Plasmids; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D014162:Transfection / Q000379:methods*; D001616:beta-Galactosidase / Q000096:biosynthesis / Q000235:genetics
chemical_list: D003102:Colloids; D005229:Fatty Acids, Monounsaturated; D008055:Lipids; D008081:Liposomes; D000644:Quaternary Ammonium Compounds; D004247:DNA; D001616:beta-Galactosidase; C070046:1,2-dioleoyloxy-3-(trimethylammonium)propane