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dc.contributor.authorRodríguez-Pulido, Alberto-
dc.contributor.authorMartín-Molina, Alberto-
dc.contributor.authorRodríguez-Beas, César-
dc.contributor.authorLlorca, Óscar-
dc.contributor.authorAicart, Emilio-
dc.contributor.authorJunquera, Elena-
dc.identifier.citationJournal of Physical Chemistry 113(47):15648-15661(2009)es_ES
dc.description14 páginas, 14 figuras, 3 tablas -- PAGS nros. 15648-15661es_ES
dc.description.abstractThe compaction of DNA by cationic liposomes constituted by a mixture of a cationic lipid, dioctadecyldimethylammonium bromide (DODAB), and a zwitterionic lipid, 1,2-dioleoyl-sn-glycero-3-phosphatidylethanolamine (DOPE) or 1,2-dilauroyl-sn-glycero-3-phosphocholine (DLPC), has been evaluated by means of experimental studies (electrophoretic mobility, conductometry, cryogenic electron transmission microscopy or cryo-TEM, and fluorescence spectroscopy) as well as theoretical calculations. This information reveals that DODAB/DOPE and DODAB/DLPC liposomes are mostly spherical and unilamellar, with a mean diameter of around 70 and 61 nm, respectively, a bilayer thickness of 4.5 nm, and gel-to-fluid transition temperatures, Tm, of around 19 and 28 °C, respectively. Their positively charged surfaces efficiently compact the negatively charged DNA by means of a strong entropically driven surface interaction that yields DODAB/DOPE−DNA and DODAB/DLPC−DNA lipoplexes as confirmed by zeta potential and ethidium bromide fluorescence intercalation assays. These experiments have permitted as well the evaluation of the different microenvironments of varying polarity of the DNA helix, liposomes, and/or lipoplexes. DODAB/DOPE−DNA and DODAB/DLPC−DNA lipoplexes have been characterized by isoneutrality ratios (L/D) of around 4.7 and 4.8, respectively, a more fluid membrane than that of the parent liposomes, and Tm around 24 and 28 °C, respectively, as revealed by fluorescence anisotropy. Cryo-TEM micrographs reveal a rich scenario of nanostructures and morphologies, from unilamellar DNA-coated liposomes to multilamellar lipoplexes passing through cluster-like structures. Phase diagrams (aggregation and re-entrant condensation phenomena), calculated by means of a phenomenological theory, have confirmed the experimental concentration domains and the isoneutrality conditions. The influence of helper lipid in the compaction process, as well as the optimum choice among those herein chosen, has been analyzedes_ES
dc.description.sponsorshipThe authors thank the MEC of Spain (Projects No. CTQ2005-1106 and SAF2008-00451 (O.L.)), to the Comunidad Autónoma of Madrid (Project No. S-SAL-0249-2006), to the “Instituto de Salud Carlos III” (Project No. RD06/0020/1001 of the “Red Temática Investigación Cooperativa en Cáncer (RTICC)”), and to the “Consejería de Innovación, Ciencia y Empresa de la Junta de Andalucía” (Project P07-FQM-02517). A.M.-M. thanks the “Programa Ramón y Cajal”, MEC, and Fondo Social Europeo (RYC-2005-000829) for his contract, and C.R.-B. thanks CONACYT (Mexico) for the Ph.D. grant. The authors also thank C. Aicart for carrying out gel agarose electrophoresis experiments at the Biochemistry and Molecular Biology Department of the UCM of Spaines_ES
dc.publisherAmerican Chemical Societyes_ES
dc.titleA theoretical and experimental approach to the compaction process of DNA by dioctadecyldimethylammonium bromide/zwitterionic mixed liposomeses_ES
dc.description.peerreviewedPeer reviewedes_ES
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