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PLoS One. 2013 May 1;8(5):e62452. doi: 10.1371/journal.pone.0062452. Print 2013.

Integrative effect of carvedilol and aerobic exercise training therapies on improving cardiac contractility and remodeling in heart failure mice.

Author information

1
School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil.

Erratum in

  • PLoS One. 2013;8(6). doi:10.1371/annotation/ae03273e-5ed4-4c8f-a985-b39503b2e7e5. Salemi, Vera [corrected to Salemi, Vera Maria Cury].
  • PLoS One. 2013;8(7). doi:10.1371/annotation/f82c53c5-e15c-470c-b5e7-7732e1435cda. Bechara, Luiz G [corrected to Bechara, Luiz R G].

Abstract

The use of β-blockers is mandatory for counteracting heart failure (HF)-induced chronic sympathetic hyperactivity, cardiac dysfunction and remodeling. Importantly, aerobic exercise training, an efficient nonpharmacological therapy to HF, also counteracts sympathetic hyperactivity in HF and improves exercise tolerance and cardiac contractility; the latter associated with changes in cardiac Ca(2+) handling. This study was undertaken to test whether combined β-blocker and aerobic exercise training would integrate the beneficial effects of isolated therapies on cardiac structure, contractility and cardiomyocyte Ca(2+) handling in a genetic model of sympathetic hyperactivity-induced HF (α2A/α2C- adrenergic receptor knockout mice, KO). We used a cohort of 5-7 mo male wild-type (WT) and congenic mice (KO) with C57Bl6/J genetic background randomly assigned into 5 groups: control (WT), saline-treated KO (KOS), exercise trained KO (KOT), carvedilol-treated KO (KOC) and, combined carvedilol-treated and exercise-trained KO (KOCT). Isolated and combined therapies reduced mortality compared with KOS mice. Both KOT and KOCT groups had increased exercise tolerance, while groups receiving carvedilol had increased left ventricular fractional shortening and reduced cardiac collagen volume fraction compared with KOS group. Cellular data confirmed that cardiomyocytes from KOS mice displayed abnormal Ca(2+) handling. KOT group had increased intracellular peak of Ca(2+) transient and reduced diastolic Ca(2+) decay compared with KOS group, while KOC had increased Ca(2+) decay compared with KOS group. Notably, combined therapies re-established cardiomyocyte Ca(2+) transient paralleled by increased SERCA2 expression and SERCA2:PLN ratio toward WT levels. Aerobic exercise trained increased the phosphorylation of PLN at Ser(16) and Thr(17) residues in both KOT and KOCT groups, but carvedilol treatment reduced lipid peroxidation in KOC and KOCT groups compared with KOS group. The present findings provide evidence that the combination of carvedilol and aerobic exercise training therapies lead to a better integrative outcome than carvedilol or exercise training used in isolation.

PMID:
23658728
PMCID:
PMC3641040
DOI:
10.1371/journal.pone.0062452
[Indexed for MEDLINE]
Free PMC Article

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