title: Integrative effect of carvedilol and aerobic exercise training therapies on improving cardiac contractility and remodeling in heart failure mice.
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.
authors: School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil.
authors: Andréa S
authors: AS
authors: Vanzelli
authors: Alessandra
authors: A
authors: Medeiros
authors: Natale
authors: N
authors: Rolim
authors: Jan B
authors: JB
authors: Bartholomeu
authors: Telma F
authors: TF
authors: Cunha
authors: Luiz R G
authors: LR
authors: Bechara
authors: Luiz G
authors: LG
authors: Bechara
authors: Enéas R M
authors: ER
authors: Gomes
authors: Katt C
authors: KC
authors: Mattos
authors: Raquel
authors: R
authors: Sirvente
authors: Vera Maria Cury
authors: VM
authors: Salemi
authors: Vera
authors: V
authors: Salemi
authors: Charles
authors: C
authors: Mady
authors: Carlos E
authors: CE
authors: Negrao
authors: Silvia
authors: S
authors: Guatimosim
authors: Patricia C
authors: PC
authors: Brum
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000494:pharmacology* / Q000627:therapeutic use; D000818:Animals; D001794:Blood Pressure; D020013:Calcium Signaling; D002227:Carbazoles / Q000494:pharmacology* / Q000627:therapeutic use; D000077261:Carvedilol; D002478:Cells, Cultured; D003131:Combined Modality Therapy; D004353:Drug Evaluation, Preclinical; D005081:Exercise Therapy; D017079:Exercise Tolerance; D006333:Heart Failure / Q000378:metabolism / Q000503:physiopathology / Q000628:therapy*; D006339:Heart Rate; D015227:Lipid Peroxidation; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009200:Myocardial Contraction; D009206:Myocardium / Q000378:metabolism / Q000473:pathology; D032383:Myocytes, Cardiac / Q000378:metabolism; D018384:Oxidative Stress; D010805:Physical Conditioning, Animal; D011412:Propanolamines / Q000494:pharmacology* / Q000627:therapeutic use; D053498:Sarcoplasmic Reticulum Calcium-Transporting ATPases / Q000378:metabolism; D020257:Ventricular Remodeling
chemical_list: D000319:Adrenergic beta-Antagonists; D002227:Carbazoles; D011412:Propanolamines; D000077261:Carvedilol; D053498:Sarcoplasmic Reticulum Calcium-Transporting ATPases; C506947:Atp2a2 protein, mouse
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