Potencial antioxidante do extrato de folhas de Carica papaya Linn (Caricaceae) em camundongos com estresse oxidativo induzido por ciclofosfamida
DOI:
https://doi.org/10.15448/1980-6108.2020.1.34702Palavras-chave:
antimutagenicidade, defesa antioxidante, etnobotânica, metabólitos secundários, eritropoieseResumo
OBJETIVOS: O objetivo deste estudo foi investigar os efeitos do extrato bruto de folhas de Carica papaya sobre o estresse oxidativo em camundongos induzidos pela ciclofosfamida, bem como a caracterização do perfil fitoquímico deste extrato.
MÉTODOS: Os camundongos Swiss machos receberam 15 dias de tratamento com o extrato (500 mg kg-1, via gavagem) e injeção intraperitoneal de ciclofosfamida (75 mg kg-1) ou salina (0,9%) no 15º dia. Após 24 h do último tratamento, os animais foram anestesiados para retirada do sangue, sacrificados e retirada dos órgãos para análises (fígado, rim e coração). Nos testes bioquímicos foram determinados: parâmetros hematológicos em sangue, aminotransferases, fosfatase alcalina, dosagens de glicose e colesterol total no plasma, antioxidantes enzimáticos e não enzimáticos e marcador de dano lipídico foram avaliados em diferentes tecidos, além de análises genotóxicas e histopatológicas.
RESULTADOS: No extrato de folhas de Carica papaya foram identificados os flavonoides quercetina-3β-D-glicosídeo e rutina, além de resultados positivos para alcaloides, saponinas e taninos. Este extrato aumentou a atividade das enzimas glutationa-S-transferase e catalase no fígado e diminuiu os níveis de glutationa reduzida nos rins, a concentração do hematócrito, a contagem dos glóbulos vermelhos e a hemoglobina. Promoveu a diminuição das espécies reativas de ácido tiobarbitúrico (TBARS) nos rins, a atividade da enzima
aspartato aminotransferase no plasma e foi antimutagênico no teste do micronúcleo.
CONCLUSÕES: O estudo mostrou que o extrato de Carica papaya foi benéfico contra eventos oxidativos e preveniu danos no DNA. O extrato também mostrou hepatotoxicidade, portanto, a infusão prolongada de folhas de mamão não é aconselhável.
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