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Sugizaki MM, Leopoldo AS, Okoshi MP, Bruno A, Conde SJ, Lima-Leopoldo AP, Padovani CR, Carvalho RF, Nascimento AFD, Campos DHSD, Nogueira CR, Cicogna AC. Severe food restriction induces myocardial dysfunction related to SERCA2 activity. Can J Physiol Pharmacol 2009; 87:666-73. [DOI: 10.1139/y09-060] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Previous studies have shown that food restriction promotes myocardial dysfunction in rats. However, the molecular mechanisms that are responsible are unclear. We investigated the role of sarcoplasmic reticulum Ca2+-ATPase (SERCA2) on myocardial performance in food-restricted rats. Male Wistar–Kyoto rats, 60 days old, were fed a control or restricted diet (daily energy intake reduced to 50% of the control) for 90 days. Expression of Serca2a, phospholamban (PLB), Na+/Ca2+ exchanger (NCX), and thyroid hormone receptor (TRα1, TRβ1) mRNA was determined by quantitative PCR. SERCA2 activity was measured by using 20 µmol/L cyclopiazonic acid (CPA) in a left ventricular papillary muscle preparation during isometric contraction in basal conditions and during post-rest contraction. Serum concentrations of thyroxine (T4) and thyrotropin (TSH) were also determined. The 50%-restricted diet reduced body and ventricular weight and serum T4 and TSH levels. The interaction of CPA and food restriction reduced peak developed tension and maximum rate of tension decline (–dT/dt), but increased the resting tension intensity response during post-rest contraction. PLB and NCX mRNA were upregulated and TRα1 mRNA was downregulated by food restriction. These results suggest that food restriction promotes myocardial dysfunction related to impairment of sarcoplasmic reticulum Ca2+ uptake as a result of a hypothyroid state.
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Affiliation(s)
- Mário Mateus Sugizaki
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - André Soares Leopoldo
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Marina Politi Okoshi
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Alessandro Bruno
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Sandro José Conde
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Ana Paula Lima-Leopoldo
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Carlos Roberto Padovani
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Robson Francisco Carvalho
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - André Ferreira do Nascimento
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Dijon Henrique Salomé de Campos
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Célia Regina Nogueira
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
| | - Antonio Carlos Cicogna
- Department of Clinical and Cardiology, School of Medicine, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Biostatistics, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Morphology, Institute of Biological Sciences, UNESP State University Júlio Mesquita Filho, Botucatu, São Paulo, Brazil
- Department of Physical Education, FIB, Faculdades Integradas de Bauru, São Paulo, Brazil
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