DNA alters the bilayer structure of cationic lipid diC14-amidine: A spin label study


Autoria(s): Benatti, Carlos Roberto; Barroso, Rafael Pianca; LONEZ, Caroline; RUYSSCHAERT, Jean-Marie; Lamy, Maria Teresa Moura
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2009

Resumo

Cationic lipids-DNA complexes (lipoplexes) have been used for delivery of nucleic acids into cells in vitro and in vivo. Despite the fact that, over the last decade, significant progress in the understanding of the cellular pathways and mechanisms involved in lipoplexes-mediated gene transfection have been achieved, a convincing relationship between the structure of lipoplexes and their in vivo and in vitro transfection activity is still missing. How does DNA affect the lipid packing and what are the consequences for transfection efficiency is the point we want to address here. We investigated the bilayer organization in cationic liposomes by electron spin resonance (ESR). Phospholipids spin labeled at the 5th and 16th carbon atoms were incorporated into the DNA/diC14-amidine complex. Our data demonstrate that electrostatic interactions involved in the formation of DNA-cationic lipid complex modify the packing of the cationic lipid membrane. DNA rigidifies the amidine fluid bilayer and fluidizes the amidine rigid bilayer just below the gel-fluid transition temperature. These effects were not observed with single nucleotides and are clearly related to the repetitive charged motif present in the DNA chain and not to a charge-charge interaction. These modifications of the initial lipid packing of the cationic lipid may reorient its cellular pathway towards different routes. A better knowledge of the cationic lipid packing before and after interaction with DNA may therefore contribute to the design of lipoplexes capable to reach specific cellular targets. (c) 2009 Elsevier B.V. All rights reserved.

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

FAPESP

Universidade de São Paulo (USP)

Universidade de São Paulo USP

CNPq/FNRS[491308/05-1]

FNRS

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Belgian National Fund for Scientific Research (FNRS)

Fonds de la Recherche Scientifique (FNRS) - Bélgica

Identificador

BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES, v.1788, n.6, p.1304-1309, 2009

0005-2736

http://producao.usp.br/handle/BDPI/29223

10.1016/j.bbamem.2009.02.003

http://dx.doi.org/10.1016/j.bbamem.2009.02.003

Idioma(s)

eng

Publicador

ELSEVIER SCIENCE BV

Relação

Biochimica Et Biophysica Acta-biomembranes

Direitos

restrictedAccess

Copyright ELSEVIER SCIENCE BV

Palavras-Chave #diC14-amidine #Cationic liposome #DNA interaction #Spin label #Structural property #LIPOSOME COMPLEXES #RESONANCE SPECTRA #MOLECULAR-MOTION #GENE DELIVERY #PLASMID DNA #TRANSFECTION #CHOLESTEROL #MEMBRANES #RELEASE #AMPHIPHILE #Biochemistry & Molecular Biology #Biophysics
Tipo

article

original article

publishedVersion