5 research outputs found
Physico-chemical characterization of asolectinâgenistein liposomal system: An approach to analyze its in vitro antioxidant potential and effect in glioma cells viability
AbstractIn this study, the interaction between soy isoflavone genistein and asolectin liposomes was investigated by monitoring the effects of isoflavone on lipidic hydration, mobility, location and order. These properties were analyzed by the following techniques: horizontal attenuated total reflection Fourier transform infrared spectroscopy (HATR-FTIR), low-field 1H nuclear magnetic resonance (NMR), high-field 31P NMR, zeta potential, differential scanning calorimetry (DSC) and UVâvis spectroscopy. The antioxidant and antitumoral activities of the genistein liposomal system were also studied. The genistein saturation concentration in ASO liposomes corresponded to 484ÎŒM. HATRâFTIR results indicated that genistein influences the dynamics of the lipidic phosphate, choline, carbonyl and acyl chain methylenes groups. At the lipid polar head, HATRâFTIR and 31P NMR results showed that the isoflavone reduces the hydration degree of the phosphate group, as well as its mobility. Genistein ordered the lipid interfacial carbonyl group, as evidenced by the HATRâFTIR bandwidth analysis. This ordering effect was also observed in the lipidic hydrophobic region, by HATRâFTIR, NMR, DSC and turbidity responses. At the saturation concentration, liposome-loaded genistein inhibits the lipid peroxidation induced by hydroxyl radical in 90.9%. ASO liposome-loaded genistein at 100ÎŒM decreased C6 glioma cell viability by 57% after 72h of treatment. Results showed an increase of the genistein in vitro activities after its incorporation in liposomes. The data described in this work will contribute to a better understanding of the interaction between genistein and a natural-source membrane and of its influence on isoflavone biological activities. Furthermore, the antitumoral results showed that genistein-based liposomes, which contain natural-sourced lipids, may be promising as a drug delivery system to be used in the glioma therapy
AVALIAĂĂO DOS NĂVEIS DE ESTRESSE OXIDATIVO EM PACIENTES FUMANTES CRĂNICOS
O consumo do cigarro associado ao estresse oxidativo aumenta muito as chances do desenvolvimento de varias patologias. Sendo assim, o objetivo deste trabalho foi analisar a ocorrĂȘncia de estresse oxidativo em indivĂduos fumantes crĂŽnicos. Tal avaliação foi realizada atravĂ©s da anĂĄlise dos nĂveis de lipoperoxidação por meio da determinação de TBARS, anĂĄlise dos nĂveis de lesĂ”es em proteĂnas pela determinação proteĂnas carboniladas, e avaliação dos nĂveis de alguns antioxidantes nĂŁo enzimĂĄticos como: o acido Ășrico e a GSH. Os resultados obtidos mostraram alteraçÔes significativas nos nĂveis de TBARS e proteĂnas carboniladas no grupo dos fumantes crĂŽnicos, quando comparados ao grupo controle, evidenciando lesĂ”es em lipĂdios e proteĂnas decorrentes do estresse oxidativo pela exposição ao fumo. Em contrapartida, os nĂveis de ĂĄcido Ășrico nĂŁo mostraram diferenças considerĂĄveis entre os grupos estudados. Apesar disso, os nĂveis de GSH, principal antioxidante endĂłgeno, foram bastante superiores no grupo de fumantes, mostrando que o organismo esta tentando diminuir as lesĂ”es decorrentes do estresse oxidativo. Contudo, pode-se observar que houve presença de estresse oxidativo nas amostras analisadas, aumentando assim a possibilidade do desenvolvimento de patologias como cĂąncer e doenças respiratĂłrias