English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/53375
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

A theoretical and experimental approach to the compaction process of DNA by dioctadecyldimethylammonium bromide/zwitterionic mixed liposomes

AuthorsRodríguez-Pulido, Alberto; Martín-Molina, Alberto; Rodríguez-Beas, César; Llorca, Óscar ; Aicart, Emilio; Junquera, Elena
Issue Date26-Nov-2009
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry 113(47):15648-15661(2009)
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 analyzed
Description14 páginas, 14 figuras, 3 tablas -- PAGS nros. 15648-15661
Publisher version (URL)http://dx.doi.org/10.1021/jp906777g
URIhttp://hdl.handle.net/10261/53375
DOI10.1021/jp906777g
ISSN1520-6106
E-ISSN1520-5207
Appears in Collections:(CIB) Artículos
Files in This Item:
File Description SizeFormat 
restringido.pdf21,67 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.