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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Giant Unilamellar Vesicles Formed by Hybrid Films of Agarose and Lipids Display Altered Mechanical Properties

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Autor(es):
Lira, Rafael B. [1, 2] ; Dimova, Rumiana [2] ; Rieke, Karin A. [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Fed Sao Paulo, Dept Biofis, Sao Paulo - Brazil
[2] Max Planck Inst Colloids & Interfaces, Dept Theory & Biosyst, Potsdam - Germany
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: BIOPHYSICAL JOURNAL; v. 107, n. 7, p. 1609-1619, OCT 7 2014.
Citações Web of Science: 26
Resumo

Giant unilamellar vesicles (GUVs) are presumably the current most popular biomimetic membrane model. Preparation of GUVs in physiological conditions using the classical electroformation method is challenging. To circumvent these difficulties, a new method was recently reported, by which GUVs spontaneously swell from hybrid films of agarose and lipids. However, agarose is left encapsulated in the vesicles in different amounts. In this work, we thoroughly characterize the mechanical properties of these agarose-GUVs in response to electric pulses, which induce vesicle deformation and can lead to membrane poration. We show that the relaxation dynamics of deformed vesicles, both in the presence and absence of poration, is significantly slowed down for agarose-GUVs when compared to agarose-free GUVs. In the presence of poration, agarose polymers prevent complete pore closure and lead to high membrane permeability. A fraction of the Vesicles were found to encapsulate agarose in the form of a gel-like meshwork. These vesicles rupture and open up after electroporation and the meshwork is expelled through a macropore. When the agarose-GUVs are heated above the melting temperature of agarose for 2 h before use, vesicle response is (partially) recovered due to substantial release of encapsulated agarose during temperature treatment. Our findings reveal potential artifactual behavior of agarose-GUVs in processes involving morphological changes in the membrane as well as poration. (AU)

Processo FAPESP: 13/07246-5 - Eletroporação e fusão de vesículas eletricamente carregadas
Beneficiário:Rafael Bezerra de Lira
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
Processo FAPESP: 12/10442-8 - Perturbações em bicamadas lipídicas carregadas induzidas por pulsos elétricos, peptídeos antimicrobianos e vesículas de carga oposta
Beneficiário:Karin Do Amaral Riske
Linha de fomento: Auxílio à Pesquisa - Regular