Caracterização estrutural de bicamadas catiônicas de DODAB contendo c24:1 beta-glicosilceramida

• Autor(a) principal: Martins, Leticia de Souza [UNIFESP]
• Data de Publicação: 2019
• Outros Autores: Nomura, Daniela Akiko [UNIFESP], Duarte, Evandro Luiz [UNIFESP], Riske, Karin do Amaral [UNIFESP], Lamy, Maria Teresa Moura [UNIFESP], Rozenfeld, Julio Henrique Kravcuks [UNIFESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNIFESP
• Texto Completo: https://www.sciencedirect.com/science/article/pii/S0005273618303742; https://repositorio.unifesp.br/handle/11600/61231
• topic: glucosylceramide; dioctadecyldimethylammonium bromide; cationic membrane; differential scanning calorimetry; electron spin resonance; fluorescence microscopy

The effect of 5 mol%, 9 mol%, and 16 mol% of C24:1 β-glucosylceramide (βGlcCer) on the structure of cationic DODAB bilayers was investigated by means of differential scanning calorimetry (DSC), electron spin resonance (ESR) spectroscopy and fluorescence microscopy. βGlcCer is completely miscible with DODAB at all fractions tested, since no domains were observed in fluorescence microscopy or ESR spectra. The latter showed that βGlcCer destabilized the gel phase of DODAB bilayers by decreasing the gel phase packing. As a consequence, βGlcCer induced a decrease in the phase transition temperature and cooperativity o f DODAB bilayers, as seen in DSC thermograms. ESR spectra also showed that βGlcCer induced an increase in DODAB fluid phase order and/or rigidity. Despite their different structures, a similar effect of loosening the gel phase packing and turning the fluid phase more rigid/organized has also been observed when low molar fractions of cholesterol were incorporated in DODAB bilayers. The structural characterization of mixed membranes made of cationic 2 lipids and glucosylceramides may be important for developing novel immunotherapeutic tools such as vaccine adjuvants.