Long-term abdominal adiposity activates several parameters of cardiac energy function.
J Physiol Biochem
; 72(3): 525-37, 2016 Sep.
Article
en En
| MEDLINE
| ID: mdl-26255304
Abdominal obesity increases the incidence of cardiac events but reduces mortality when one of these events occurs. The phenomenon called obesity paradox might be related to myocardial energetics. This study was aimed at determining whether long-term abdominal adiposity alters cardiac energy function. Two groups of male Wistar rats were fed a standard or a Western-type (WD) diet for 8 months. The ex vivo coronary reactivity and mechanical function as well as the mitochondrial oxidative phosphorylation (mOxPhos) and hydrogen peroxide release (mH2O2r) were determined. Abdominal adiposity was augmented by the WD. This was also the case for the coronary reactivity to acetylcholine, but the rate pressure product remained roughly stable despite a reduction of the left ventricle-developed pressure partly compensated by a slight increase in heart rate. The prolonged WD administration resulted in an improvement of mOxPhos, but the mH2O2r was exaggerated which was confirmed in the whole cell by a reduced aconitase to fumarase ratio. This did not modify the plasma oxidative stress due to an increased plasma antioxidant status. In conclusion, long-term WD administration improved the cardiac fitness and might predispose the organism to the obesity paradox. Conversely, the increased mitochondrial mH2O2r can precipitate the heart toward cardiomyopathy if the WD is maintained for a longer duration.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Envejecimiento
/
Metabolismo Energético
/
Adiposidad
/
Obesidad Abdominal
/
Corazón
/
Cardiomiopatías
/
Miocardio
Tipo de estudio:
Etiology_studies
Límite:
Animals
Idioma:
En
Revista:
J Physiol Biochem
Asunto de la revista:
BIOQUIMICA
/
FISIOLOGIA
Año:
2016
Tipo del documento:
Article
País de afiliación:
Francia
Pais de publicación:
España