Direct Visualization Of The Action Of Triton X-100 On Giant Vesicles Of Erythrocyte Membrane Lipids.

dc.creatorCasadei, Bruna R
dc.creatorDomingues, Cleyton C
dc.creatorde Paula, Eneida
dc.creatorRiske, Karin A
dc.date2014-Jun
dc.date2015-11-27T13:42:40Z
dc.date2015-11-27T13:42:40Z
dc.date.accessioned2018-03-29T01:20:58Z
dc.date.available2018-03-29T01:20:58Z
dc.identifierBiophysical Journal. v. 106, n. 11, p. 2417-25, 2014-Jun.
dc.identifier1542-0086
dc.identifier10.1016/j.bpj.2014.04.039
dc.identifierhttp://www.ncbi.nlm.nih.gov/pubmed/24896120
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/201451
dc.identifier24896120
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1301684
dc.descriptionThe raft hypothesis proposes that microdomains enriched in sphingolipids, cholesterol, and specific proteins are transiently formed to accomplish important cellular tasks. Equivocally, detergent-resistant membranes were initially assumed to be identical to membrane rafts, because of similarities between their compositions. In fact, the impact of detergents in membrane organization is still controversial. Here, we use phase contrast and fluorescence microscopy to observe giant unilamellar vesicles (GUVs) made of erythrocyte membrane lipids (erythro-GUVs) when exposed to the detergent Triton X-100 (TX-100). We clearly show that TX-100 has a restructuring action on biomembranes. Contact with TX-100 readily induces domain formation on the previously homogeneous membrane of erythro-GUVs at physiological and room temperatures. The shape and dynamics of the formed domains point to liquid-ordered/liquid-disordered (Lo/Ld) phase separation, typically found in raft-like ternary lipid mixtures. The Ld domains are then separated from the original vesicle and completely solubilized by TX-100. The insoluble vesicle left, in the Lo phase, represents around 2/3 of the original vesicle surface at room temperature and decreases to almost 1/2 at physiological temperature. This chain of events could be entirely reproduced with biomimetic GUVs of a simple ternary lipid mixture, 2:1:2 POPC/SM/chol (phosphatidylcholine/sphyngomyelin/cholesterol), showing that this behavior will arise because of fundamental physicochemical properties of simple lipid mixtures. This work provides direct visualization of TX-100-induced domain formation followed by selective (Ld phase) solubilization in a model system with a complex biological lipid composition.
dc.description106
dc.description2417-25
dc.languageeng
dc.relationBiophysical Journal
dc.relationBiophys. J.
dc.rightsaberto
dc.rightsCopyright © 2014 Biophysical Society. Published by Elsevier Inc. All rights reserved.
dc.sourcePubMed
dc.subjectCell Membrane
dc.subjectDetergents
dc.subjectErythrocytes
dc.subjectLiposomes
dc.subjectMembrane Lipids
dc.subjectOctoxynol
dc.titleDirect Visualization Of The Action Of Triton X-100 On Giant Vesicles Of Erythrocyte Membrane Lipids.
dc.typeArtículos de revistas


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