Data/hora: 05/06/2024 10:00:50

Provedor de dados: | 56
País: | Brazil
Título: | DNA-lipid systems: A physical chemistry study
Autores: | Dias,R.; Antunes,F.; Miguel,M.; Lindman,S.; Lindman,B.
Data: | 2002-05-01
Ano: | 2002
Palavras-chave: | DNA; Cationic surfactants; Catanionic mixtures; Chitosan; Phase behavior; Polyelectrolyte-oppositely charged surfactant systems.
Resumo: | It is well known that the interaction of polyelectrolytes with oppositely charged surfactants leads to an associative phase separation; however, the phase behavior of DNA and oppositely charged surfactants is more strongly associative than observed in other systems. A precipitate is formed with very low amounts of surfactant and DNA. DNA compaction is a general phenomenon in the presence of multivalent ions and positively charged surfaces; because of the high charge density there are strong attractive ion correlation effects. Techniques like phase diagram determinations, fluorescence microscopy, and ellipsometry were used to study these systems. The interaction between DNA and catanionic mixtures (i.e., mixtures of cationic and anionic surfactants) was also investigated. We observed that DNA compacts and adsorbs onto the surface of positively charged vesicles, and that the addition of an anionic surfactant can release DNA back into solution from a compact globular complex between DNA and the cationic surfactant. Finally, DNA interactions with polycations, chitosans with different chain lengths, were studied by fluorescence microscopy, in vivo transfection assays and cryogenic transmission electron microscopy. The general conclusion is that a chitosan effective in promoting compaction is also efficient in transfection.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000500002
Editor: | Associação Brasileira de Divulgação Científica
Relação: | 10.1590/S0100-879X2002000500002
Formato: | text/html
Fonte: | Brazilian Journal of Medical and Biological Research  v.35 n.5 2002
Fonte: | info:eu-repo/semantics/openAccess