title: Preparation, characterization, and efficient transfection of cationic liposomes and nanomagnetic cationic liposomes.
abstract: OBJECTIVE
  Cationic liposomes (CLs) are composed of phospholipid bilayers. One of the most important applications of these particles is in drug and gene delivery. However, using CLs to deliver therapeutic nucleic acids and drugs to target organs has some problems, including low transfection efficiency in vivo. The aim of this study was to develop novel CLs containing magnetite to overcome the deficiencies.
  
  
  METHODS
  CLs and magnetic cationic liposomes (MCLs) were prepared using the freeze-dried empty liposome method. Luciferase-harboring vectors (pGL3) were transferred into liposomes and the transfection efficiencies were determined by luciferase assay. Firefly luciferase is one of most popular reporter genes often used to measure the efficiency of gene transfer in vivo and in vitro. Different formulations of liposomes have been used for delivery of different kinds of gene reporters. Lipoplex (liposome-plasmid DNA complexes) formation was monitored by gel retardation assay. Size and charge of lipoplexes were determined using particle size analysis. Chinese hamster ovary cells were transfected by lipoplexes (liposome-pGL3); transfection efficiency and gene expression level was evaluated by luciferase assay.
  
  
  RESULTS
  High transfection efficiency of plasmid by CLs and novel nanomagnetic CLs was achieved. Moreover, lipoplexes showed less cytotoxicity than polyethyleneimine and Lipofectamine.
  
  
  CONCLUSIONS
  Novel liposome compositions (1,2-dipalmitoyl-sn-glycero-3-phosphocholine [DPPC]/dioctadecyldimethylammonium bromide [DOAB] and DPPC/cholesterol/DOAB) with high transfection efficiency can be useful in gene delivery in vitro. MCLs can also be used for targeted gene delivery, due to magnetic characteristic for conduction of genes or drugs to target organs.
authors.affiliation: Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran.
authors.forename: Hamid Reza
authors.initials: HR
authors.lastname: Samadikhah
authors.forename: Asia
authors.initials: A
authors.lastname: Majidi
authors.forename: Maryam
authors.initials: M
authors.lastname: Nikkhah
authors.forename: Saman
authors.initials: S
authors.lastname: Hosseinkhani
mesh_terms: D015060:1,2-Dipalmitoylphosphatidylcholine / Q000737:chemistry; D000818:Animals; D016466:CHO Cells; D002412:Cations / Q000737:chemistry / Q000494:pharmacology; D002470:Cell Survival / Q000187:drug effects; D002784:Cholesterol / Q000737:chemistry; D006224:Cricetinae; D003412:Cricetulus; D004247:DNA / Q000008:administration & dosage / Q000235:genetics; D024202:Electrophoretic Mobility Shift Assay; D008081:Liposomes / Q000737:chemistry* / Q000494:pharmacology; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D060526:Magnetic Fields; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D010957:Plasmids / Q000008:administration & dosage / Q000235:genetics; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D014162:Transfection / Q000379:methods*
chemical_list: D002412:Cations; D008081:Liposomes; D058185:Magnetite Nanoparticles; D000644:Quaternary Ammonium Compounds; C026584:dioctadecyltrimethylammonium; D015060:1,2-Dipalmitoylphosphatidylcholine; D004247:DNA; D002784:Cholesterol; D008156:Luciferases
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