Improvement of the energy supply and contractile function in normal and ischemic rat hearts by dietary orotic acid

LIFE SCIENCES

卷:90

Article

Jardim Porto, Laura Cristina^1,3  de Castro, Carlos Henrique^2,3  Quintao Savergnini, Silvia Silveira³  Sousa Santos, Sergio Henrique³  Matos Ferreira, Adaliene Versiani^3,4  de Souza Cordeiro, Leticia Maria³  de Sousa Sobrinho, Deny Bruce²  Souza Santos, Robson Augusto³  de Almeida, Alvair Pinto³  Botion, Leida Maria³ 

[1] Univ Fed Lavras, Dept Food Sci, Lavras, MG, Brazil

[2] Univ Fed Goias, Dept Physiol, Goiania, Go, Brazil

[3] Univ Fed Minas Gerais, Inst Biol Sci, Dept Physiol & Biophys, Belo Horizonte, MG, Brazil

[4] Univ Fed Minas Gerais, Dept Nursing, Belo Horizonte, MG, Brazil

关键词: Cardiac metabolism;    Isolated perfused heart;    PPAR alpha;    Fatty acid oxidation;    Glycolytic flux;    Lipoprotein lipase;   

DOI  :  10.1016/j.lfs.2011.12.012

来源: Elsevier

【 摘 要 】

Aims: As cardiac performance is closely related to its energy supply, our study investigated the effect of the orotic acid cardioprotective agent on the pathways of energy supply, in both conditions of normal flow and ischemia. Main methods: Male Wistar rats were fed during nine days with a balanced diet only or supplemented with 1% orotic acid. Key findings: Dietary administration of orotic acid increased the cardiac utilization of fatty acids, activity of the lipoprotein lipase, expression of the gene of peroxisome proliferator-activated receptor alpha and its target enzymes. In addition, orotic acid increased the myocardial uptake and incorporation of glucose, glycogen content and level of GLUT4, concentration of glycolytic metabolites and lactate production in both experimental conditions, baseline and after regional ischemia. Significance: Thus, in orotic acid hearts there was a simultaneous stimulus of fatty acid oxidation and glycolytic pathway, reflected in increased energetic content even in pre-ischemia. The analysis of the cardiac contractility index showed a positive inotropic effect of orotic acid due, at least in part, to the increased availability of energy. The result allows us to suggest that the metabolic changes induced by orotic acid result in appreciable alterations on myocardial contractile function. (C) 2012 Elsevier Inc. All rights reserved.

【 授权许可】

Free