title: Physicochemical properties affecting lipofection potency of a new series of 1,2-dialkoylamidopropane-based cationic lipids.
abstract: The in vitro transfection activity of a novel series of N,N'-diacyl-1,2-diaminopropyl-3-carbamoyl-(aminoethane) derivatives was evaluated against a mouse melanoma cell line at different +/- charge ratios, in the presence and absence of helper lipids. Only the unsaturated derivative N,N'-dioleoyl-1,2-diaminopropyl-3-carbamoyl-(aminoethane), (1,2lmp[5]) mediated significant increase in the reporter gene level which was significantly boosted in the presence of DOPE peaking at +/- charge ratio of 2. The electrostatic interactions between the cationic liposomes and plasmid DNA were investigated by gel electrophoresis, fluorescence spectroscopy, dynamic light scattering and electrophoretic mobility techniques. In agreement with the transfection results, 1,2lmp[5]/DOPE formulation was most efficient in associating with and retarding DNA migration. The improved association between the dioleoyl derivative and DNA was further confirmed by ethidium bromide displacement assay and particle size distribution analysis of the lipoplexes. Differential scanning calorimetry studies showed that 1,2lmp[5] was the only lipid that exhibited a main phase transition below 37 degrees C. Likewise, 1,2lmp[5] was the only lipid found to form all liquid expanded monolayers at 23 degrees C. In conclusion, the current findings suggest that high in vitro transfection activity is mediated by cationic lipids characterized by increased acyl chain fluidity and high interfacial elasticity.
authors.affiliation: Division of Pharmaceutical Sciences, Arnold and Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, 75 Dekalb Avenue, Brooklyn, NY 11201, USA.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Aljaberi
authors.forename: Michael
authors.initials: M
authors.lastname: Spelios
authors.forename: Molinda
authors.initials: M
authors.lastname: Kearns
authors.forename: Bilge
authors.initials: B
authors.lastname: Selvi
authors.forename: Michalakis
authors.initials: M
authors.lastname: Savva
mesh_terms: D000818:Animals; D002152:Calorimetry, Differential Scanning; D002412:Cations; D045744:Cell Line, Tumor; D002470:Cell Survival; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004247:DNA / Q000008:administration & dosage*; D004587:Electrophoresis, Agar Gel; D004996:Ethidium; D007202:Indicators and Reagents; D008027:Light; D008055:Lipids / Q000138:chemical synthesis / Q000737:chemistry* / Q000633:toxicity; D008081:Liposomes; D008546:Melanoma, Experimental / Q000235:genetics; D008567:Membranes, Artificial; D051379:Mice; D010316:Particle Size; D010714:Phosphatidylethanolamines / Q000737:chemistry; D010957:Plasmids / Q000235:genetics; D011407:Propane / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry* / Q000633:toxicity; D012542:Scattering, Radiation; D014162:Transfection / Q000379:methods*
chemical_list: C410262:1,2-dioleoyl-glycero-3-phosphatidyl ethanolamine; D002412:Cations; D007202:Indicators and Reagents; D008055:Lipids; D008081:Liposomes; D008567:Membranes, Artificial; D010714:Phosphatidylethanolamines; D004247:DNA; D004996:Ethidium; D011407:Propane