Previous exercise training increases levels of ppar-alpha in long-term post-myocardial infarction in rats, which is correlated with better inflammatory response

Previous exercise training increases levels of ppar-alpha in long-term post-myocardial infarction in rats, which is correlated with better inflammatory response

Author Higuchi Santos, Marilia Harumi Google Scholar
Higuchi, Maria de Lourdes Google Scholar
Tucci, Paulo J. F. Autor UNIFESP Google Scholar
Garavelo, Sherrira M. Google Scholar
Reis, Marcia M. Google Scholar
Antonio, Ednei L. Autor UNIFESP Google Scholar
Serra, Andrey J. Google Scholar
Maranhao, Raul Cavalcante Google Scholar
Abstract OBJECTIVE: Exercise is a protective factor for cardiovascular morbidity and mortality, with unclear mechanisms. Changing the myocardial metabolism causes harmful consequences for heart function and exercise contributes to metabolic adjustment modulation. Peroxisome proliferator-activated receptors (PPARs) are also myocardium metabolism regulators capable of decreasing the inflammatory response. We hypothesized that PPAR-alpha is involved in the beneficial effects of previous exercise on myocardial infarction (MI) and cardiac function, changing the expression of metabolic and inflammatory response regulators and reducing myocardial apoptosis, which partially explains the better outcome. METHODS AND RESULTS: Exercised rats engaged in swimming sessions for 60 min/day, 5 days/week, for 8 weeks. Both the exercised rats and sedentary rats were randomized to MI surgery and followed for 1 week (EI1 or SI1) or 4 weeks (EI4 or SI4) of healing or to sham groups. Echocardiography was employed to detect left ventricular function and the infarct size. Additionally, the TUNEL technique was used to assess apoptosis and immunohistochemistry was used to quantitatively analyze the PPAR-alpha, TNF-alpha and NF-kappa B antigens in the infarcted and non-infarcted myocardium. MI-related mortality was higher in SI4 than in EI4 (25% vs 12%), without a difference in MI size. SI4 exhibited a lower shortening fraction than EI4 did (24% vs 35%) and a higher apoptosis/area rate (3.97 +/- 0.61 vs 1.90 +/- 1.82) in infarcted areas (both p=0.001). Immunohistochemistry also revealed higher TNF-alpha levels in SI1 than in EI1 (9.59 vs 4.09, p<0.001) in infarcted areas. In non-infarcted areas, EI4 showed higher levels of TNF-alpha and positive correlations between PPAR-alpha and NF-kappa B (r=0.75, p=0.02), in contrast to SI4 (r=0.05, p=0.87). CONCLUSION: Previously exercised animals had better long-term ventricular function post-MI, in addition to lower levels of local inflammatory markers and less myocardial apoptosis, which seemed to be related to the presence of PPAR-alpha.
Keywords Exercise Training
Myocardial Infarction
InflammationAcute Myocardial-Infarction
Activated Receptor-Alpha
Left-Ventricular Function
Language English
Sponsor Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [06/50489-2]
Zerbini Foundation
Grant number FAPESP: 06/50489-2
Date 2016
Published in Clinics. Sao paulo, v. 71, n. 3, p. 163-168, 2016.
ISSN 1807-5932 (Sherpa/Romeo, impact factor)
Publisher Hospital clinicas, univ sao paulo
Extent 163-168
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000374484800008
SciELO ID S1807-59322016000300163 (statistics in SciELO)

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