Abstract
Aerobic exercise training induces a unique cardioprotective phenotype, but it is becoming clear that it does not promote the same structural, functional, and molecular adaptations in both ventricles. In the present study, we aimed to better characterize and compare the molecular pathways involved in the exercise-induced remodeling of both ventricles. Female Sprague-Dawley rats were randomly assigned to control and exercise groups. Animals in the exercise group were submitted to low-intensity treadmill exercise for 54 weeks. After the experimental period, biventricular hemodynamic analysis was performed and right and left ventricles were harvested for morphological and biochemical analyses. Data showed that long-term low-intensity exercise training improves cardiac function, especially left ventricular diastolic function; however, the expression of connexin-43, CCAAT-enhancer binding protein β, and c-kit did not change in none of the ventricles. In the right ventricle, long-term exercise training induced an increase of manganese superoxide dismutase and sirtuin 3 protein expression, suggestive of improved antioxidant capacity. Our results also support that long-term aerobic exercise training imposes greater metabolic remodeling to the right ventricle, mainly by increasing mitochondrial ability to produce ATP, with no association to estrogen-related receptor α regulation.
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Acknowledgments
The authors would like to thank Celeste Resende for their assistance in sample preparation for morphological analysis.
Funding
This work was supported by the Portuguese Foundation for Science and Technology (FCT), European Union, QREN, and FEDER, and COMPETE funded the QOPNA research unit (project PEst-C/QUI/UI0062/2013), CIAFEL (UID/DTP/00617/2013), Unidade de Investigação Cardiovascular (UID/IC/00051/2013), iBiMED (UID/BIM/04501/2013), the research projects (EXPL/DTP-DES/1010/2013, FCOMP-01-0124-FEDER-041115, NETDIAMOND (SAICT-PAC/0047/2015)) and post-graduation students (grant numbers SFRH/BD/91067/2012 to R.N.F. and SFRH/BPD/90010/2012 to D.M.G.).
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Supplementary Fig. 1
Effect of exercise training on RAF-1 (74 kDa) in RV and LV and on RAF-1 and SIRT3 (28 kDa) content in isolated mitochondria. SED: sedentary, EX: exercise, LV: left ventricle, RV: right ventricle, RAF-1: RAF proto-oncogene serine/threonine-protein kinase, SIRT3: NAD-dependent deacetylase sirtuin-3. Representative immunoblots are shown above the correspondent graph (sample order has correspondence to the order of the groups presented in the graph). Values are presented as mean ± standard deviation (n = 4-6 per group). ***P < 0.001 vs. SED group. (PNG 175 kb)
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Nogueira-Ferreira, R., Ferreira, R., Padrão, A.I. et al. One year of exercise training promotes distinct adaptations in right and left ventricle of female Sprague-Dawley rats. J Physiol Biochem 75, 561–572 (2019). https://doi.org/10.1007/s13105-019-00705-4
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DOI: https://doi.org/10.1007/s13105-019-00705-4