Thyroid hormones effects on oxidative stress and cardiac remodeling in the right ventricle of infarcted rats

Life Sciences
Giana B CorssacAlex S R Araujo

Abstract

Right ventricle (RV) dysfunction post-myocardial infarction (MI) was associated with a worsened prognosis. In this scenario, reactive oxygen species (ROS) are related with the progression from MI to heart failure. Previous work showed that thyroid hormones (TH) are cardioprotective after MI. This study aims to investigate the effect of T3 and T4 administration on oxidative stress and angiogenesis parameters in the RV after MI. Wistar rats were allocated into four groups: Sham-operated (SHAM), infarcted (AMI), sham-operated + TH (SHAMT), and infarcted+TH (AMIT). The treated groups received T3 (2 μg/100g/day) and T4 (8 μg/100g/day) by gavage for 26 days. After this, echocardiographic analysis was performed and the RV was collected to western blot and biochemical analysis. Infarcted treated rats showed RV hypertrophy compared with AMI and SHAMT. Hydrogen peroxide levels were decrease and SOD activity and expression were increased in the infarcted treated rats. Besides that, the hormonal administration increased eNOS expression and prevented the reduction of VEGF levels in AMIT rats. In conclusion, TH seems to improve oxidative stress parameters, to promote physiological hypertrophy and to increase the expression of proteins involv...Continue Reading

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Citations

Oct 30, 2016·European Journal of Pharmacology·Vanessa D OrtizAlex S R Araujo
Jul 13, 2019·International Journal of Molecular Sciences·Francesca ForiniGiorgio Iervasi
Jun 20, 2020·Archives of Physiology and Biochemistry·Alexandre Luz de CastroAlex Sander da Rosa Araujo
Oct 23, 2021·Endocrinology and Metabolism·Laura SabatinoGiorgio Iervasi

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