Efeito Protetor de Nanopartículas Poliméricas com Indometacina contra Citotoxicidade Induzida por Estresse Oxidativo em Modelo Celular de Adenocarcinoma de Mama Humano
DOI:
https://doi.org/10.32635/2176-9745.RBC.2022v68n4.2545Palavras-chave:
indometacina/farmacologia, antioxidantes, nanocápsulas, neoplasiasResumo
Introdução: Anti-inflamatórios estão sendo empregados para tratamento de câncer por causa do seu ambiente inflamado. Objetivo: Investigar o potencial antioxidante da indometacina e sua genotoxicidade, livre ou carreada em nanocápsulas poliméricas, usando como modelo in vitro células MCF-7 (câncer de mama humano). Método: Desenvolvimento de nanocápsulas de poliepsilon-caprolactona (PCL) por método de deposição interfacial, caracterizada por determinação de pH por potenciômetro; diâmetro médio e índice de polidispersão por espalhamento dinâmico de luz; potencial zeta por mobilidade eletroforética; eficiência de encapsulação por cromatografia líquida de alta eficiência; formação de efeito corona; método de 2’,7’-diclorofluoresceína diacetato (DCFH-DA) por ensaio espectrofluorimétrico; determinação de óxido nítrico (NO) por espectrometria e ensaio de genotoxicidade por método de clivagem do DNA plasmidial. Resultados: Os resultados mostraram leve pH ácido (4,78 ± 0,10), tamanhos em torno de 200 nm e PDI<0,2 com potencial zeta em torno de -20 mV e eficiência de encapsulação de 99% (1 mg mL-1), apresentando perfil de formação de corona dose-dependente em 24 horas de incubação. Conclusão: O ensaio DCFH-DA mostrou que não há produção de espécies reativas de oxigênio (ROS), enquanto a determinação de NO mostrou que Ind-OH-NC de 26,7 a 100 μM aumentou as espécies reativas de nitrogênio (RNS), demonstrando potencial antioxidante contra MCF-7. Nenhuma amostra nas concentrações avaliadas induziu clivagem do DNA, sendo considerado um tratamento seguro.
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