Angiotensin receptor blockade improves the net balance of cardiac Ca2+ handling-related proteins in sympathetic hyperactivity-induced heart failure

Autor(es)

Ferreira, Julio C. B. ; Moreira, Jose B. N. ; Campos, Juliane C. ; Pereira, Marcelo G. ; Mattos, Katt C. ; Coelho, Marcele A. ; Brum, Patricia C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Phys Educ & Sport, Dept Biodinam Movimento Corpo Humano, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Life Sciences; v. 88, n. 13-14, p. 578-585, MAR 28 2011.
• Citações Web of Science: 17

Resumo

Aims: The clinical benefits of angiotensin II type 1 (AT1) receptor blockers (ARB) in heart failure (HF) include cardiac anti-remodeling and improved ventricular function. However, the cellular mechanisms underlying the benefits of ARB on ventricular function need to be better clarified. In the present manuscript, we evaluated the effects of AT1 receptor blockade on the net balance of Ca(2+) handling proteins in hearts of mice lacking alpha(2A) and alpha(2C) adrenoceptors (alpha(2A)/alpha(2C)ARKO), which develop sympathetic hyperactivity (SH) induced-HF. Main methods: A cohort of male wild-type (WT) and congenic alpha(2A)/alpha(2C)ARKO mice in a C57BL6/J genetic background (5-7 mo of age) was randomly assigned to receive either placebo or ARB (Losartan, 10 mg/kg for 8wks). Ventricular function (VF) was assessed by echocardiography, and cardiac myocyte width and ventricular fibrosis by a computer-assisted morphometric system. Sarcoplasmic reticulum Ca(2+) ATPase (SERCA2), phospholamban (PLN), phospho-Ser(16)-PLN, phospho-Thr(17)-PLN, phosphatase 1 (PP1), Na(+)-Ca(2+) exchanger (NCX), Ca(2+)/calmodulin-dependent protein kinase 11 (CaMKII) and phospho-Thr(286)-CaMKII were analyzed by Western blot. Key findings: alpha(2A)/alpha(2C)ARKO mice displayed ventricular dysfunction, cardiomyocyte hypertrophy and cardiac fibrosis paralleled by decreased SERCA2 and increased phospho-Thr(17)-PLN, CaMKII, phospho-Thr(286)-CaMKII and NCX levels. ARB induced anti-cardiac remodeling effect and improved VF in alpha(2A)/alpha(2C)ARKO associated with increased SERCA2 and phospho-Ser(16)-PLN levels, and SERCA2:NCX ratio. Additionally, ARB decreased phospho-Thr(17)-PLN levels as well as reestablished NCX, CaMKII and phospho-Thr(286)-CaMKII toward WT levels. Significance: Altogether, these data provide new insights on intracellular Ca(2+) regulatory mechanisms underlying improved ventricular function by ARB therapy in HF. (c) 2011 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 05/59740-7 - Exercício físico e controle autonômico na fisiopatologia cardiovascular
• Beneficiário: Carlos Eduardo Negrão
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 09/03143-1 - Controle de qualidade de proteína na insuficiência cardíaca: papel das diferentes isoformas de proteína quinase C
• Beneficiário: Julio Cesar Batista Ferreira
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado