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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Aerobic exercise training rescues cardiac protein quality control and blunts endoplasmic reticulum stress in heart failure rats

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Bozi, Luiz H. M. ; Jannig, Paulo R. ; Rolim, Natale ; Voltarelli, Vanessa A. ; Dourado, Paulo M. M. ; Wisloff, Ulrik ; Brum, Patricia C.
Total Authors: 7
Document type: Journal article
Source: JOURNAL OF CELLULAR AND MOLECULAR MEDICINE; v. 20, n. 11, p. 2208-2212, NOV 2016.
Web of Science Citations: 18

Cardiac endoplasmic reticulum (ER) stress through accumulation of misfolded proteins plays a pivotal role in cardiovascular diseases. In an attempt to reestablish ER homoeostasis, the unfolded protein response (UPR) is activated. However, if ER stress persists, sustained UPR activation leads to apoptosis. There is no available therapy for ER stress relief. Considering that aerobic exercise training (AET) attenuates oxidative stress, mitochondrial dysfunction and calcium imbalance, it may be a potential strategy to reestablish cardiac ER homoeostasis. We test the hypothesis that AET would attenuate impaired cardiac ER stress after myocardial infarction (MI). Wistar rats underwent to either MI or sham surgeries. Four weeks later, rats underwent to 8 weeks of moderate-intensity AET. Myocardial infarction rats displayed cardiac dysfunction and lung oedema, suggesting heart failure. Cardiac dysfunction in MI rats was paralleled by increased protein levels of UPR markers (GRP78, DERLIN-1 and CHOP), accumulation of misfolded and polyubiquitinated proteins, and reduced chymotrypsin-like proteasome activity. These results suggest an impaired cardiac protein quality control. Aerobic exercise training improved exercise capacity and cardiac function of MI animals. Interestingly, AET blunted MI-induced ER stress by reducing protein levels of UPR markers, and accumulation of both misfolded and polyubiquinated proteins, which was associated with restored proteasome activity. Taken together, our study provide evidence for AET attenuation of ER stress through the reestablishment of cardiac protein quality control, which contributes to better cardiac function in post-MI heart failure rats. These results reinforce the importance of AET as primary non-pharmacological therapy to cardiovascular disease. (AU)

FAPESP's process: 14/23703-0 - The role myogenic precursor cells in skeletal myopathy-induced heart failure: effect of exercise training
Grantee:Patricia Chakur Brum
Support type: Regular Research Grants
FAPESP's process: 10/50048-1 - Cellular and functional bases of exercise in cardiovascular diseases
Grantee:Carlos Eduardo Negrão
Support type: Research Projects - Thematic Grants