Impact of Leucine Supplementation on Exercise Training Induced Anti-Cardiac Remodeling Effect in Heart Failure Mice

Autor(es)

Almeida Monteiro de Moraes, Wilson Max ^{[1, 2]} ; Melara, Thais Plasti ^[1] ; Moraes de Souza, Pamella Ramona ^[3] ; Guimaraes, Fabiana de Salvi ^[1] ; Marchesi Bozi, Luiz Henrique ^[1] ; Brum, Patricia Chakur ^[1] ; Medeiros, Alessandra ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Phys Educ & Sport, BR-05508900 Sao Paulo - Brazil

^[2] Univ Fed Sao Paulo, Biosci Dept, BR-11015020 Santos - Brazil

^[3] Nove Julho Univ UNINOVE, Postgrad Program Med, BR-01504001 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NUTRIENTS; v. 7, n. 5, p. 3751-3766, MAY 2015.
• Citações Web of Science: 4

Resumo

Leucine supplementation potentiates the effects of aerobic exercise training (AET) on skeletal muscle; however, its potential effects associated with AET on cardiac muscle have not been clarified yet. We tested whether leucine supplementation would potentiate the anti-cardiac remodeling effect of AET in a genetic model of sympathetic hyperactivity-induced heart failure in mice (alpha(2A)/alpha(2C)ARKO). Mice were assigned to five groups: wild type mice treated with placebo and sedentary (WT, n = 11), alpha(2A)/alpha(2C)ARKO treated with placebo and sedentary (KO, n = 9), alpha(2A)/alpha(2C)ARKO treated with leucine and sedentary (KOL, n = 11), alpha(2A)/alpha(2C)ARKO treated with placebo and AET (KOT, n = 12) or alpha(2A)/alpha(2C)ARKO treated with leucine and AET (KOLT, n = 12). AET consisted of four weeks on a treadmill with 60 min sessions (six days/week, 60% of maximal speed) and administration by gavage of leucine (1.35 g/kg/day) or placebo (distilled water). The AET significantly improved exercise capacity, fractional shortening and re-established cardiomyocytes' diameter and collagen fraction in KOT. Additionally, AET significantly prevented the proteasome hyperactivity, increased misfolded proteins and HSP27 expression. Isolated leucine supplementation displayed no effect on cardiac function and structure (KOL), however, when associated with AET (KOLT), it increased exercise tolerance to a higher degree than isolated AET (KOT) despite no additional effects on AET induced anti-cardiac remodeling. Our results provide evidence for the modest impact of leucine supplementation on cardiac structure and function in exercised heart failure mice. Leucine supplementation potentiated AET effects on exercise tolerance, which might be related to its recognized impact on skeletal muscle. (AU)

• Processo FAPESP: 10/50048-1 - Bases celulares e funcionais do exercício físico na doença cardiovascular
• Beneficiário: Carlos Eduardo Negrão
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 09/06830-0 - Insuficiência Cardíaca por Excesso de Catecolaminas: Influência do Treinamento Físico Aeróbico associado à Sobrecarga de Leucina na Musculatura Esquelética
• Beneficiário: Wilson Max Almeida Monteiro de Moraes
• Modalidade de apoio: Bolsas no Brasil - Mestrado