Chá-mate (Ilex paraguariensis) previne a cardiotoxicidade aguda induzida pela doxorrubicina em ratos
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Data
2017-07-28
Autores
Silva, Lilian Xavier da [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
A doxorrubicina (DXO) é eficaz contra diferentes formas de câncer, em adultos e crianças, porém seu uso pode causar cardiotoxicidade aguda e crônica, associada ao aumento do estresse oxidativo. Alguns antioxidantes naturais demonstraram ser eficazes em minimizar esses efeitos da DXO, no entanto, o chá mate (CM), não foi avaliado neste contexto. Nossa hipótese é que o pré-tratamento com CM por 30 dias, reduz o dano oxidativo agudo no coração e assim preserva a função cardíaca. Para testar essa hipótese, foram investigados os efeitos do pré-tratamento diário de ratos Wistar machos com 40 mg/kg m.c. de CM, contra a cardiotoxicidade aguda induzida por DXO. Para a escolha da dose de CM ratos Wistar foram divididos em grupo tratados com doses diferentes de chá (10, 20 e 40 mg/m.c., gavagem) e DXO (grupos CM + DXO). Os grupos controle (C), tratados com DXO (DXO) receberam água (1,0 mL, gavagem). Os grupos receberam CM solúvel diluído em água (8 mg/mL). No 29° do tratamento com CM, administrou-se uma dose de DXO (15 mg/kg m.c. - IP) aos grupos DXO e CM + DXO. No 31° dia, após administração de tiopental (50 mg/kg m.c.) associado à lidocaína (4,0 mg/kg m.c.), foram submetidos ao eletrocardiograma (ECG) antes da punção cardíaca (Autorização CEUA FOA: 416/2015). Creatina quinase total (CK) e a fração MB (CK-MB), foram estimadas no plasma. No homogenato de coração (KCl 1,15% m/v) foram quantificadas as substâncias reativas ao ácido tiobarbitúrico (TBARS), glutationa (GSH), atividade de superóxido dismutase total (SOD) e da isoforma SOD1, e expressões de SOD1, Akt total e p-Akt, por western blotting. O pré-tratamento com 40 mg/kg m.c. de CM preveniu o aumento da frequência cardíaca, o prolongamento do intervalo QTc e PR, o aumento de CK e CK-MB e de TBARS. Também preveniu a redução de GSH, SOD e SOD1. Além disso, o aumento da relação p-Akt/Akt. Concluímos que o pré-tratamento com 40 mg/kg m.c. CM previne o dano oxidativo cardíaco agudo induzido pelo DXO, preservando a função cardíaca.
Doxorubicin (DXO) is effective against different forms of cancer in adults and children, but its use may cause acute and chronic cardiotoxicity associated with increased oxidative stress. Some natural antioxidants have been shown to be effective in minimizing the effects of DXO; however, mate tea (CM), has not been evaluated in this context. Our hypothesis is that CM pretreatment for 30 days, reduces acute oxidative damage in the heart. To test this hypothesis, the effects of daily pretreatment of male Wistar rats at 40 mg / kg m.c. of CM, against acute cardiotoxicity induced by DXO were investigated. For the choice of CM dose, Wistar rats were divided into groups treated with different doses of tea (10, 20 and 40 mg / mc, gavage) (CM + DXO groups). Groups control (C), treated with DXO (DXO) received water (1.0 mL, gavage). The CM + DXO groups received soluble CM diluted in water (8 mg / mL) during the same period. At 29 ° of CM treatment, DXO and CM + DXO groups were given a dose of DXO (15 mg / m.c.-IP). On the 31st day, after administration of lidocaine (4.0 mg / kg mc) thiopental (50 mg / kg mc), all rats were submitted to electrocardiogram (ECG) prior to cardiac puncture (CEUA FOA Authorization: 416 / 2015). Total creatine kinase (CK) and MB fraction (CK-MB) were estimated in plasma. The thiobarbituric acid reactive substances (TBARS), glutathione (GSH), total superoxide dismutase (SOD) activity and the cytoplasmic isoform SOD1, in addition to SOD1 expression, were quantified in the heart homogenate (KCl 1.15% m / v) , Total Akt and p-Akt, by western blotting. Pretreatment with 40 mg / kg m.c. of CM prevented a increased heart rate, prolongation of the QTc and PR interval, increase in plasma CK and CK-MB, and TBARS in the tissue. It also prevented the reduction of GSH, SOD and SOD1. In addition, the increase in the p-Akt / Akt ratio observed after DXO was not observed in rats pretreated at 40 mg / kg m.c. of CM. We conclude that pretreatment with 40 mg / kg m.c. CM prevents acute cardiac oxidative damage induced by DXO, preserving cardiac function.
Doxorubicin (DXO) is effective against different forms of cancer in adults and children, but its use may cause acute and chronic cardiotoxicity associated with increased oxidative stress. Some natural antioxidants have been shown to be effective in minimizing the effects of DXO; however, mate tea (CM), has not been evaluated in this context. Our hypothesis is that CM pretreatment for 30 days, reduces acute oxidative damage in the heart. To test this hypothesis, the effects of daily pretreatment of male Wistar rats at 40 mg / kg m.c. of CM, against acute cardiotoxicity induced by DXO were investigated. For the choice of CM dose, Wistar rats were divided into groups treated with different doses of tea (10, 20 and 40 mg / mc, gavage) (CM + DXO groups). Groups control (C), treated with DXO (DXO) received water (1.0 mL, gavage). The CM + DXO groups received soluble CM diluted in water (8 mg / mL) during the same period. At 29 ° of CM treatment, DXO and CM + DXO groups were given a dose of DXO (15 mg / m.c.-IP). On the 31st day, after administration of lidocaine (4.0 mg / kg mc) thiopental (50 mg / kg mc), all rats were submitted to electrocardiogram (ECG) prior to cardiac puncture (CEUA FOA Authorization: 416 / 2015). Total creatine kinase (CK) and MB fraction (CK-MB) were estimated in plasma. The thiobarbituric acid reactive substances (TBARS), glutathione (GSH), total superoxide dismutase (SOD) activity and the cytoplasmic isoform SOD1, in addition to SOD1 expression, were quantified in the heart homogenate (KCl 1.15% m / v) , Total Akt and p-Akt, by western blotting. Pretreatment with 40 mg / kg m.c. of CM prevented a increased heart rate, prolongation of the QTc and PR interval, increase in plasma CK and CK-MB, and TBARS in the tissue. It also prevented the reduction of GSH, SOD and SOD1. In addition, the increase in the p-Akt / Akt ratio observed after DXO was not observed in rats pretreated at 40 mg / kg m.c. of CM. We conclude that pretreatment with 40 mg / kg m.c. CM prevents acute cardiac oxidative damage induced by DXO, preserving cardiac function.
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Palavras-chave
Cardiotoxicidade, Ilex paraguariensis, Estresse oxidativo, Superóxido dismutase-1, Glutationa, Cardiotoxicity, Ilex paraguariensis, Oxidative stress, Superoxide dismutase-1, Glutathione