Abstract
The aim of the present work was to assess whether changes in adipose tissue gene expression related with adipogenesis and/or thermogenesis could be involved in the mechanism conferring susceptibility or resistance to develop obesity in high-fat fed outbreed rats. For this purpose, male Wistar rats were fed with standard laboratory diet (control group) or high fat diet. After 15 days, two groups of rats with significant differences on body weight gain in response to the high fat diet were characterized and identified as diet-induced obesity (DIO) and diet resistant (DR) rats. A significant increase in visceral white adipose tissue (WAT) PRARγ and aP2 (p<0.05) mRNA levels associated to a decrease in RARγ expression (p<0.05) was observed in DIO rats, suggesting an increase of adipogenesis. Furthermore, our data showed a marked increase in brown adipose tissue (BAT) of UCP1 mRNA in DIO animals (p<0.01) (without affecting PGC-1α gene expression), whereas no changes were found in WAT UCP2 gene expression. All these data suggest that the variations found in the expression pattern of PPARγ, aP2 and RARγ by high-fat diet could be involved, at least in part, in the differences in body weight gain and adiposity observed between DR and DIO animals. The compensatory adaptations through the increase in energy expenditure by changes on the expression levels of UCP1 seem not to be enough to avoid the obesity onset in the DIO group.
Resumen
EI objeto del presente trabajo fue determinar si cambios en la expresión de genes del tejido adiposo relacionados con la adipogénesis y la termogénesis pudieran estar implicados en la resistencia o susceptibilidad al desarrollo de obesidad en ratas alimentadas con dieta hipergrasa. Tras 15 días de ingesta de la dieta rica en grasa (dieta de cafetería), se identificó un grupo susceptible (DIO) y otro resistente (DR) al desarrollo de obesidad. El incremento significativo observado en la expresión de PPARγ y aP2 (p<0.05), junto con el descenso en la expresión de RARγ (p<0.05) en el tejido adiposo blaco de ratas DIO, sugiere un incremento del proceso adipogénico en estos animales. Además, nuestros datos mostraron aumento en los niveles de ARNm de UCP1 (sin afectar a la expresión del gen PGC-1α) en el tejido adiposo marrón en los animales DIO, mientras que no se observaron cambios en la expresión de UCP2 en tejido adiposo blanco. Todos estos datos sugieren que los cambios encontrados en la expresión de PPARγ, aP2 y RARγ podrían estar implicados en las diferencias en la ganancia del peso corporal y la adiposidad observadas entre los grupos DIO y DR. Los mecanismos compensadores puestos en marcha mediante el incremento de los niveles de expresión de UCP1 no parecen ser suficientes para evitar la instauración de la obesidad en este grupo de animales.
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Pérez-Echarri, N., Noel-Suberville, C., Redonnet, A. et al. Role of adipogenic and thermogenic genes in susceptibility or resistance to develop diet-induced obesity in rats. J. Physiol. Biochem. 63, 317–327 (2007). https://doi.org/10.1007/BF03165763
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DOI: https://doi.org/10.1007/BF03165763